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Journal articles on the topic 'Interacting and isolated galaxies'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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1

Karachentsev, Igor D., Valentina E. Karachentseva, Walter K. Huchtmeier, Dmitry I. Makarov, and Serafim S. Kaisin. "Probe of Dark Galaxies via Disturbed/Lopsided Isolated Galaxies." Proceedings of the International Astronomical Union 3, S244 (2007): 235–46. http://dx.doi.org/10.1017/s1743921307014044.

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AbstractSearching for lopsided/interacting objects among 1500 isolated galaxies yields only eight strongly disturbed galaxies which may be explained as a result of their interaction with massive dark objects. We present results of spectral and photometric observations of these galaxies performed with the 6-m telescope that lead to significant restriction on cosmic abundance of dark galaxies.

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2

Struck, Curtis. "Star formation in mergers and interacting galaxies: gathering the fuel." Proceedings of the International Astronomical Union 2, S237 (2006): 317–22. http://dx.doi.org/10.1017/s1743921307001664.

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AbstractSelected results from recent studies of star formation in galaxies at different stages of interaction are reviewed. Recent results from the Spitzer Space Telescope are highlighted. Ideas on how large-scale driving of star formation in interacting galaxies might mesh with our understanding of star formation in isolated galaxies and small scale mechanisms within galaxies are considered. In particular, there is evidence that on small scales star formation is determined by the same thermal and turbulent processes in cool compressed clouds as in isolated galaxies. If so, this affirms the no

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3

Zaragoza-Cardiel, J., J. E. Beckman, J. Font, A. Camps-Fariña, B. García-Lorenzo, and S. Erroz-Ferrer. "Star formation enhancement characteristics in interacting galaxies." Proceedings of the International Astronomical Union 10, S309 (2014): 354. http://dx.doi.org/10.1017/s174392131401045x.

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AbstractWe have observed 12 interacting galaxies using the Fabry-Perot interferometer GHαFaS (Galaxy Hα Fabry-Perot system) on the 4.2m William Herschel Telescope (La Palma). We have extracted the physical properties (sizes, Hα luminosity and velocity dispersion) of 236 HII regions for the full sample of interacting galaxies. We have derived the physical properties of 664 HII regions for a sample of 28 isolated galaxies observed with the same instrument in order to compare both populations of HII regions, finding that there are brighter and denser star forming regions in the interacting galaxi

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4

Athanassoula, E. "Isolated and Interacting Galaxies: Simulations with GRAPE." Symposium - International Astronomical Union 208 (2003): 177–88. http://dx.doi.org/10.1017/s0074180900207134.

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I present N-body simulations of isolated and interacting galaxies, made on GRAPE machines. In particular I discuss the formation and evolution of N-body bars and compare their properties to those of bars in early-type and late-type galactic discs. I argue that the halo can help the bar grow, contrary to previous beliefs, by taking positive angular momentum from it via its resonant stars. I then focus on the interaction and subsequent merging of a barred disc galaxy with a spheroidal satellite. The evolution depends strongly on the mass (density) of the satellite and may lead to its destruction

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5

Kaneko, Hiroyuki, Nario Kuno, Daisuke Iono, et al. "Properties of molecular gas in galaxies in early and mid stages of Interaction. III. Resolved Kennicutt–Schmidt law." Publications of the Astronomical Society of Japan 74, no. 2 (2022): 343–63. http://dx.doi.org/10.1093/pasj/psab129.

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Abstract We study properties of the interstellar medium, an ingredient of stars, and star formation activity, in four nearby galaxy pairs in the early and mid stages of interaction for both a galaxy scale and a kpc scale. The galaxy-scale Kennicutt–Schmidt law shows that seven of eight interacting galaxies have a star formation rate within a factor of three compared with the best fit of the isolated galaxies, although we have shown that molecular hydrogen gas is efficiently produced from atomic hydrogen during the interaction in the previous paper (Kaneko et al. 2017 PASJ, 69, 66). The galaxy-

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6

Garay-Solis, Yeny, Jorge K. Barrera-Ballesteros, Dario Colombo, et al. "Exploring the Impact of Galactic Interactions and Mergers on the Central Star Formation of APEX/EDGE–CALIFA Galaxies." Astrophysical Journal 952, no. 2 (2023): 122. http://dx.doi.org/10.3847/1538-4357/acd781.

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Abstract Galactic interactions and subsequent mergers are a paramount channel for galaxy evolution. In this work, we use the data from 236 star-forming CALIFA galaxies with integrated molecular gas observations in their central region (approximately within an effective radius)—from the APEX millimeter telescope and the CARMA millimeter telescope array. This sample includes isolated (126 galaxies) and interacting galaxies in different merging stages (110 galaxies; from pairs, merging, and postmerger galaxies). We show that the impact of interactions and mergers in the center of galaxies is reve

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Fernández, María, Fangting Yuan, Shiyin Shen, Jun Yin, Ruixiang Chang, and Shuai Feng. "Isolated Galaxies versus Interacting Pairs with MaNGA." Galaxies 3, no. 4 (2015): 156–63. http://dx.doi.org/10.3390/galaxies3040156.

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8

Young, J. S. "Molecular Gas and Star Formation in Interacting and Isolated Galaxies." Symposium - International Astronomical Union 186 (1999): 217–26. http://dx.doi.org/10.1017/s0074180900112665.

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The results of the FCRAO Extragalactic CO Survey are used to examine the trends regarding the molecular gas distribution, the star formation efficiency, and the global gas surface densities (HI and H2) in galaxies as a function of environment. Relative to a sample of isolated Sbc-Scd galaxies, the strongly interacting galaxies have more compact gas distributions, a higher mean value for the global star formation efficiency, and a larger fraction of gas in molecular form. Not only is the molecular gas redistributed during interactions, but evidence is presented for an enhanced conversion of ato

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9

Bergvall, Nils, Eija Laurikainen, Susanne Aalto, and Lennart Johansson. "Star Formation in a Magnitude Limited Sample of Interacting Galaxies." Symposium - International Astronomical Union 171 (1996): 344. http://dx.doi.org/10.1017/s0074180900232634.

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We report on optical/near-IR spectroscopy and photometry of a magnitude limited sample of interacting pairs and merging galaxies and a control sample of apparently isolated galaxies (1,2). All observations were carried out at ESO, La Silla. When compared to the control sample, the interacting galaxies show only a moderate increase of star formation activity, in the central area typically a factor 2-3. Starburst activity seems to be very rare. Ongoing CO observations (Aalto, Horellou, Booth, Wiklind, Bergvall) indicate that these objects are not particularly rich in molecular gas. The interacti

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10

Lisenfeld, U., L. Verdes-Montenegro, J. Sulentic, et al. "The Far-Infrared Properties of the Most Isolated Galaxies." Proceedings of the International Astronomical Union 2, S235 (2006): 219. http://dx.doi.org/10.1017/s1743921306006259.

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AbstractWe describe the mid- (MIR) and far- (FIR) infrared properties of a large (~1000) sample of the most isolated galaxies in the local Universe. This sample is intended as a “nurture-free” zero point against which more environmentally influenced samples can be compared. We reprocess IRAS MIR/FIR survey data using the ADDSCAN/SCANPI utility for 1030 out of 1050 galaxies from the Catalogue of Isolated Galaxies (CIG) as part of the AMIGA project. We focus on diagnostics (FIR luminosity LFIR, R = log(LFIR/LB) and IRAS colours) thought to be sensitive to effects of environment or interaction. T

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11

Pan 潘, Hsi-An 璽安, Lihwai Lin, Sebastián F. Sánchez, Jorge K. Barrera-Ballesteros, and Bau-Ching Hsieh. "SDSS-IV MaNGA: Spatial Evolution of Gas-phase Metallicity Changes Induced by Galaxy Interactions." Astrophysical Journal 982, no. 2 (2025): 130. https://doi.org/10.3847/1538-4357/adbbd2.

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Abstract Gas-phase metallicity in interacting and merging galaxies offers key insights into their star formation processes and evolutionary histories. This study investigates the spatial evolution of gas-phase metallicity (i.e., oxygen abundance, 12 + log(O/H)) in these galaxies using integral field unit data from the SDSS-IV MaNGA survey, focusing on changes in metallicity gradients across different stages of interactions—from early encounters to final coalescence. By comparing interacting and merging galaxies with isolated counterparts, we identify characteristic trends in how interactions i

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12

Kronberger, T., W. Kapferer, S. Schindler, A. Böhm, E. Kutdemir, and B. L. Ziegler. "Internal Kinematics of Modelled Isolated and Interacting Disc Galaxies." Proceedings of the International Astronomical Union 2, S235 (2006): 216. http://dx.doi.org/10.1017/s1743921306006223.

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AbstractWe present a systematic investigation of the velocity fields of both isolated and interacting spiral galaxies in combined N-body/hydrodynamical simulations. Closely mimicking the procedures applied in observations of distant, small, and faint galaxies we extract rotation curves (RCs) and compare the results of the simulation directly to observations. Irregularities in the velocity field reflect disturbances in the gravitational potential of the galaxy. They can be used to trace the recent interaction history of a galaxy and give possible clues to the type of the respective interaction.

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13

Zasov, Anatoli V. "The HI Content of Non-Isolated Galaxies." International Astronomical Union Colloquium 124 (1990): 175–82. http://dx.doi.org/10.1017/s0252921100005066.

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It seems obvious that the evolution of star formation rate and hence of gas content in galaxies strongly depends on their environment. It reveals itself in particular in enhanced star formation or even in a strong burst of activity of massive stars often observed in an interacting galaxies. Nevertheless it should be noted that the time scale for the gas to be exhausted in these galaxies is unknown even approximately. To clarify a role of surroundings in the evolution of disk galaxies we should compare the HI content of isolated and non-isolated galaxies otherwise similar by their properties.

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14

Donoso, L., M. V. Alonso, D. García Lambas, G. Coldwell, E. O. Schmidt, and G. A. Oio. "Analysis of interacting and isolated quasars." Astronomy & Astrophysics 615 (July 2018): A11. http://dx.doi.org/10.1051/0004-6361/201629407.

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Aims. The main goal of this study was to determine the effects on equivalent widths (EWs) of some spectral lines produced in the quasars by the presence of surrounding galaxies. To carry this out, a sample of 4663 quasars (QSOs) in the redshift range of 0.20 to 0.40 from the Sloan Digital Sky Survey data release 7 was analyzed. Methods. Three QSO sub-samples were defined, taking into account the projected separations and radial velocity differences with neighboring galaxies. In this way, we utilized two sub-samples of QSOs with strong and weak galaxy interactions, with projected separations sm

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15

Xu, Cong, and Jack W. Sulentic. "Quantifying the Fir Interaction Enhancement in Paired Galaxies." International Astronomical Union Colloquium 124 (1990): 297–301. http://dx.doi.org/10.1017/s025292110000525x.

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We study the “Catalogue of Isolated Pairs of Galaxies in the Northern Hemisphere” (CPG hereafter) by Karachentsev (1972), and a well matched comparison sample taken from the “Catalog of Isolated Galaxies” (Karachentseva 1973, CIG hereafter), in order to quantify the enhanced FIR emission properties of interacting galaxies (see Sulentic 1989 for details of the samples). The isolation criterion used in compiling the CPG and the CIG means that both the pairs and single galaxies have been Httle influenced by their environment for a long time (t ≳ 109 yrs: Stocke et al 1978).

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16

Menon, T. K. "Radio Diagnostics of Galaxy Interactions." Symposium - International Astronomical Union 186 (1999): 383–86. http://dx.doi.org/10.1017/s0074180900113154.

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The Hickson Compact Groups (Hickson 1982) are relatively isolated systems of galaxies with projected separations comparable to the diameters of the galaxies themselves and are an ideal laboratory for the study of the effects of interactions on the various properties of galaxies. Roughly one third of the galaxies in HCG show clear signs of interaction such as tidal distortion, truncation, and peculiar rotation curves. Galaxies that are not now interacting may have suffered past interactions or mergers. My study is based on a VLA survey of galaxies of different morphologies in 65 Compact Groups

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17

Combes, F. "Extended Gas in Interacting Systems." Symposium - International Astronomical Union 186 (1999): 89–96. http://dx.doi.org/10.1017/s0074180900112318.

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HI observations have revealed large gaseous extensions in interacting and merging systems. The interstellar gas is obviously dragged out in tidal tails during an encounter, and the percentage of HI in the tails increases with the merging stage. However, the opposite is true for the molecular gas, which is observed highly concentrated towards the nuclei of interacting galaxies, amounting to a significant fraction of the dynamical mass. Statistically, there appears to be more gas observed in interacting galaxies than in normal, isolated ones. As N-body simulations show, the gas is driven inwards

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18

Fuentes-Carrera, Isaura, Nelli Cárdenas-Martínez, Martín Nava-Callejas, and Margarita Rosado. "Gas dynamics and star formation in “isolated” and interacting galaxies using FP observations." Proceedings of the International Astronomical Union 14, S353 (2019): 264–65. http://dx.doi.org/10.1017/s1743921319008238.

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AbstractWe present scanning Fabry-Perot observations of different types of star-forming galaxies from apparently isolated LIRGs to equal mass interacting galaxies. We analyze the ionized gas kinematics, its relation with the morphology of each system and the location of SF regions for different systems.

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Mickaelian, A. M., M. P. Véron-Cetty, and P. Véron. "What is the Maximun IR Luminosity of a Single Spiral Galaxy?" Symposium - International Astronomical Union 205 (2001): 232–33. http://dx.doi.org/10.1017/s0074180900221062.

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A new sample of IRAS galaxies at high galactic latitudes has been built by optically identifying IRAS point sources.In no more than about 100 cases, an apparently interacting system of galaxies is located near the IR source. The large majority are unambiguously identified with a single, relatively isolated galaxy. This confirms that, although galaxy interaction may trigger starburst activity, the IR luminosity in most objects is due to normal star formation in the disc.

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20

Athanassoula, E. "Evolution of Bars in Isolated and in Interacting Disk Galaxies." International Astronomical Union Colloquium 157 (1996): 309–20. http://dx.doi.org/10.1017/s0252921100049940.

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AbstractI use N-body simulations to follow the evolution of bars in both isolated and interacting disk galaxies. The pattern speeds of bars evolving in isolated galaxies decline gradually with time, due to transfer of angular momentum from the bar to other components in the galaxy. Both the form and amount of this decline depend on the model used. The fate of a bar in an interacting disk galaxy depends on the mass, central concentration and orbit of the perturber. The pattern speed, form and amplitude of the bar may change, the bar can become off-centered, or, more drastically, it can disappea

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21

Craig, Peter, Sukanya Chakrabarti, Heidi Newberg, and Alice Quillen. "Dynamically produced moving groups in interacting simulations." Monthly Notices of the Royal Astronomical Society 505, no. 2 (2021): 2561–74. http://dx.doi.org/10.1093/mnras/stab1431.

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ABSTRACT We show that smoothed particle hydrodynamics (SPH) simulations of dwarf galaxies interacting with a Milky Way-like disc produce moving groups in the simulated stellar disc. We analyse three different simulations: one that includes dwarf galaxies that mimic the Large Magellanic Cloud, Small Magellanic Cloud, and the Sagittarius dwarf spheroidal; another with a dwarf galaxy that orbits nearly in the plane of the Milky Way disc; and a null case that does not include a dwarf galaxy interaction. We present a new algorithm to find large moving groups in the VR, Vϕ plane in an automated fash

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22

Armus, Lee, Timothy M. Heckman, and George K. Miley. "The Nature of the Emission-line Nebulae in Powerful Far-infrared Galaxies." International Astronomical Union Colloquium 124 (1990): 409–13. http://dx.doi.org/10.1017/s025292110000542x.

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AbstractWe discuss our program of narrow-band (Hα + [Nil]) imaging of a sample of 30 powerful far-infrared galaxies (FIRG’s) chosen to have far-infrared spectral energy distributions similar to the prototype FIRG’s Arp 220, NGC 3690, NGC 6240, and M82. The emission-line nebulae of these IR color-selected sample (ICSS) galaxies as a class are both impressively large (mean half light radius, r ~1.3 Kpc, and mean diameter, D ~16 Kpc) and luminous (LTOT ~108 Lo; uncorrected for internal extinction). The mean total Hα + [Nil] luminosity of the FIRG’s is comparable to that found for pairs of optical

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23

Quintana, H. "Dynamics of Groups around Interacting Double Ellipticals: Measuring Dark Matter Haloes." International Astronomical Union Colloquium 124 (1990): 37–41. http://dx.doi.org/10.1017/s025292110000484x.

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Binary galaxies, as binary stars, are important to measure masses, as suggested by Page (1952). Because three orbit parameters are measurable for galaxies at one instant of time, severe uncertainties remain in the orbit and mass determinations. These uncertainties can partly be overcome by statistical studies of selected samples and/or n-body simulations. Close double galaxies (and isolated galaxies) could also be useful to estimate dynamical masses if we can find test particles around them.Interacting elliptical pairs or dumb-bell galaxies are found with a large range, between 0-1200 km s-1,

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Koribalski, Bärbel S. "H I Tidal Tails, Bridges and Clouds." Symposium - International Astronomical Union 217 (2004): 34–40. http://dx.doi.org/10.1017/s0074180900197074.

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There is plenty of intergalactic HI gas without any obvious stellar content ranging from (1) extended gas envelopes around some normal and peculiar galaxies, (2) tidal tails/bridges in interacting or merging galaxy systems, (3) large-scale rings around early type galaxies, and (4) detached clouds at varying distances from associated galaxies, but there are few or no isolated HI clouds.The HIPASS Bright Galaxy Catalog, which covers the whole southern sky, contains only one definite extragalactic HI cloud which is located close to the galaxy NGC 2442 whereas it is sensitive to isolated HI clouds

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Nadler, Ethan O., Daneng Yang, and Hai-Bo Yu. "A Self-interacting Dark Matter Solution to the Extreme Diversity of Low-mass Halo Properties." Astrophysical Journal Letters 958, no. 2 (2023): L39. http://dx.doi.org/10.3847/2041-8213/ad0e09.

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Abstract The properties of low-mass dark matter (DM) halos appear to be remarkably diverse relative to cold, collisionless DM predictions, even in the presence of baryons. We show that self-interacting DM (SIDM) can simultaneously explain observations of halo diversity at two opposite extremes—the inner density profile of the dense substructure perturbing the strong lens galaxy SDSSJ0946+1006 and the rotation curves of isolated, gas-rich ultradiffuse galaxies (UDGs). To achieve this, we present the first cosmological zoom-in simulation featuring strong DM self-interactions in a galaxy group en

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Faisst, Andreas L., Lilan Yang, M. Brinch, et al. "COSMOS-Web: The Role of Galaxy Interactions and Disk Instabilities in Producing Starbursts at z < 4." Astrophysical Journal 980, no. 2 (2025): 204. https://doi.org/10.3847/1538-4357/ada566.

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Abstract We study of the role of galaxy–galaxy interactions and disk instabilities in producing starburst activity in galaxies out to z = 4. For this, we use a sample of 387 galaxies with robust total star formation rate measurements from Herschel, gas masses from the Atacama Large Millimeter/submillimeter Array, stellar masses and redshifts from multiband photometry, and JWST/NIRCam rest-frame optical imaging. Using mass-controlled samples, we find an increased fraction of interacting galaxies in the starburst regime at all redshifts out to z = 4. This increase correlates with star formation

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Zee, Woong-Bae G., Jun-Sung Moon, Sanjaya Paudel, and Suk-Jin Yoon. "Living with Neighbors. V. Better-aligned Spiral+Spiral Galaxy Pairs Show Stronger Star Formation." Astrophysical Journal 963, no. 2 (2024): 141. http://dx.doi.org/10.3847/1538-4357/ad2063.

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Abstract Enhanced star formation (SF) with star-forming neighboring galaxies bolsters the hydrodynamical contributions during paired interactions. Although the relative spin orientation between interacting galaxies can influence this effect, it has not been comprehensively explored. In this study, utilizing a meticulously curated sample of nearby (0.02 < z < 0.06) spiral+spiral pairs and an isolated control sample from Sloan Digital Sky Survey Data Release 7, coupled with Galaxy Zoo 2, and an approach to estimate spin–spin alignment (SSA), we systematically compare the impact of relative

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Camps-Fariña, A., J. Beckman, J. Zaragoza-Cardiel, et al. "Kinematic properties of superbubbles in the Antennae, M83 and Arp 270." Proceedings of the International Astronomical Union 10, S309 (2014): 304. http://dx.doi.org/10.1017/s174392131401000x.

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AbstractSuperbubbles and large scale expansion in galaxies are important indicators of activity in galaxies: they are formed in starbursts and around active nuclei. Superbubbles can be used to give information about the star-forming region which produced them. We present in-depth results of our study of kinematically detected superbubbles using a method based on Fabry-Perot spectroscopy, which allows us to map regions of expansion across the entire disk of a galaxy. Three objects have been selected for this poster based on the interest of the results they show: two interacting galaxies, the An

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Conidis, George J. "Spin Alignment in Analogues of The Local Sheet." Proceedings of the International Astronomical Union 11, S308 (2014): 443–48. http://dx.doi.org/10.1017/s1743921316010334.

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AbstractTidal torque theory and simulations of large scale structure predict spin vectors of massive galaxies should be coplanar with sheets in the cosmic web. Recently demonstrated, the giants (Ks⩽ -22.5 mag) in the Local Volume beyond the Local Sheet have spin vectors directed close to the plane of the Local Supercluster, supporting the predictions of Tidal Torque Theory. However, the giants in the Local Sheet encircling the Local Group display a distinctly different arrangement, suggesting that the mass asymmetry of the Local Group or its progenitor torqued them from their primordial spin d

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Sánchez-Alarcón, P. M., J. Román, J. H. Knapen, L. Verdes-Montenegro, and S. Comerón. "Break type and interactions from ultra-deep optical imaging of isolated galaxies." Proceedings of the International Astronomical Union 17, S373 (2021): 275–77. http://dx.doi.org/10.1017/s1743921322004732.

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AbstractIn the standard cosmological model of galaxy evolution, mergers and interactions play a fundamental role in shaping galaxies. Galaxies that are currently isolated are thus interesting, allowing us to identify how internal or external processes impact galactic structure. However, current observational limits may be obscuring crucial information in the low-mass or low-brightness regime. We use the AMIGA catalog of isolated galaxies to explore the impact of different factors on the structure of these galaxies. In particular, we study the type of disk break based on the degree of isolation

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KOMPANIIETS, O. V. "MULTIWAVELENGTH PROPERTIES OF THE LOW-REDSHIFT ISOLATED GALAXIES WITH ACTIVE NUCLEI MODELLED WITH CIGALE." Kosmìčna nauka ì tehnologìâ 29, no. 5 (2023): 88–98. http://dx.doi.org/10.15407/knit2023.05.088.

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Using the CIGALE software, we present the preliminary results of a multiwavelength analysis of eighteen low-redshift isolated galaxies with active nuclei (isolated AGNs). This sample was formed by cross-matching the 2MIG isolated AGNs sample with the SDSS DR9 catalog. The host galaxies of this sample have not undergone a merger for at least three billion years, making them a unique laboratory for studying interactions between various astrophysical processes without the complicating factors of merging with other galaxies or the effects of a denser environment. In addition, the study of isolated

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Lane, Richard R., Tom Richtler, and Ricardo Salinas. "What can isolated elliptical galaxies tell us about Cold Dark Matter?" Proceedings of the International Astronomical Union 11, S317 (2015): 326–27. http://dx.doi.org/10.1017/s1743921315008789.

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AbstractDue to their environment isolated elliptical galaxies (IEs) should not be undergoing extant evolutionary processes yet many IEs have interacting dwarf companions, and where no merger remnants are visible IEs are often dynamically young. Furthermore, some IEs do not require dark matter to explain their dynamics. However, according to Cold Dark Matter (CDM) simulations all elliptical galaxies should be dark matter dominated, even if isolated, and IEs are much rarer in nature than predicted by CDM. Moreover, merging at the ~107 M⊙ level was recently discovered in the M31 system, showing t

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Rampazzo, R., A. Omizzolo, M. Uslenghi, et al. "Morphology and surface photometry of a sample of isolated early-type galaxies from deep imaging." Astronomy & Astrophysics 640 (August 2020): A38. http://dx.doi.org/10.1051/0004-6361/202038156.

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Context. Isolated early-type galaxies are evolving in unusually poor environments for this morphological family, which is typical of cluster inhabitants. We investigate the mechanisms driving the evolution of these galaxies. Aims. Several studies indicate that interactions, accretions, and merging episodes leave their signature on the galaxy structure, from the nucleus down to the faint outskirts. We focus on revealing such signatures, if any, in a sample of isolated early-type galaxies, and we quantitatively revise their galaxy classification. Methods. We observed 20 (out of 104) isolated ear

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Ryan-Weber, E. V., M. E. Putman, K. C. Freeman, G. R. Meurer, and R. L. Webster. "Discovery of Intergalactic H II Regions." Symposium - International Astronomical Union 217 (2004): 492–97. http://dx.doi.org/10.1017/s0074180900198250.

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We have discovered a number of very small isolated H II regions 20-30 kpc from their nearest galaxy. The H II regions appear as tiny emission line dots (ELdots) in narrow band images obtained by the NOAO Survey for Ionization in Neutral Gas Galaxies (SINGG). We have spectroscopic confirmation of 5 isolated H II regions in 3 systems. The Hα luminosities of the H II regions are equivalent to the ionizing flux of only 1 large or a few small OB stars each. These stars appear to have formed in situ and represent atypical star formation in the low density environment of galaxy outskirts. In situ sta

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Jones, M. G., D. Espada, L. Verdes-Montenegro, et al. "The AMIGA sample of isolated galaxies." Astronomy & Astrophysics 609 (December 22, 2017): A17. http://dx.doi.org/10.1051/0004-6361/201731448.

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Context. We present the largest catalogue of HI single dish observations of isolated galaxies to date, as part of the multi-wavelength compilation being performed by the AMIGA project (Analysis of the interstellar Medium in Isolated GAlaxies). Despite numerous studies of the HI content of galaxies, no revision focused on the HI scaling relations of the most isolated L∗ galaxies has been made since Haynes & Giovanelli (1984, AJ, 89, 758). Aims. The AMIGA sample has been demonstrated to be almost “nurture free”, therefore, by creating scaling relations for the HI content of these galaxies we

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Bootz, Vitor, Marina Trevisan, Trinh Thuan, Yuri Izotov, Angela Krabbe, and Oli Dors. "Isolated groups of extremely blue dwarf galaxies." Proceedings of the International Astronomical Union 15, S359 (2020): 168–69. http://dx.doi.org/10.1017/s1743921320001830.

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AbstractInteractions and mergers between dwarf galaxies are mostly gas-rich and should be marked by an intense star formation activity. But these processes, which are expected to be common at earlier times, are very difficult to observe at low redshifts. To investigate that, we look in the Sloan Digital Sky Survey (SDSS) for compact groups that contain one luminous compact galaxy (LCG) with very high specific star formation rate (sSFR) and at least two other blue galaxies. We found 24 groups that satisfy these criteria, among which 12 groups have SDSS spectroscopic data for at least 2 member g

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Deng, Xin-Fa. "A comparison of the star formation rate and the specific star formation rate distributions between paired galaxies and isolated ones." Canadian Journal of Physics 91, no. 4 (2013): 337–42. http://dx.doi.org/10.1139/cjp-2012-0487.

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From each of two volume-limited main galaxy samples of the Sloan Digital Sky Survey data release 7, a paired galaxy sample and an isolated galaxy sample are constructed and comparative studies between the star formation of galaxies in pairs and isolated are performed to explore influences of galaxy interactions on star formation. It is found that isolated galaxies have an enhancement of the star formation rate and the specific star formation rate, which suggests that interactions between galaxies are not the trigger of enhanced star formation.

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Cutri, Roc M. "Nuclear and Extended Infrared Emission in Paired and Isolated Galaxies." International Astronomical Union Colloquium 124 (1990): 415–19. http://dx.doi.org/10.1017/s0252921100005431.

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The empirical connection between gravitational and collisional interactions among galaxies and enhanced activity has been well-documented. However, the physical mechanisms which are responsible for triggering the various forms of activity have not been determined. We present the preliminary results of a study of the nuclear and integrated infrared properties of galaxies chosen from the Catalog of Isolated Pairs of Galaxies in the Northern Hemisphere (Karachentsev 1972; hereafter CPG) and the Catalog of Isolated Galaxies (Karachentseva 1973; hereafter KI). Observations of these large, unbiased

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Ramírez-Moreta, P., L. Verdes-Montenegro, S. Leon, J. Blasco-Herrera, M. Fernández-Lorenzo, and M. Yun. "Faint features in the isolated galaxy CIG96." Proceedings of the International Astronomical Union 11, S321 (2016): 292. http://dx.doi.org/10.1017/s1743921316008826.

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The AMIGA project carries out a multiwavelength study of the largest catalogue of isolated galaxies from the Local Universe (CIG, Karachentseva 1973). Compared to any other sample —field galaxies included— and using highly strict isolation criteria (unperturbed for at least ~3 Gyr, Verdes-Montenegro et al. 2005), all the results show that these galaxies have the lowest values of the physical magnitudes expected to be enhanced by interactions. This strongly supports isolated galaxies as ideal laboratories for the study of galaxy formation and evolution. Despite CIG galaxies show the lowest HI i

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Márquez, I. "Environmental Effects on the Properties of Spiral Galaxies: Isolated Pairs of Spirals." Symposium - International Astronomical Union 171 (1996): 410. http://dx.doi.org/10.1017/s0074180900233299.

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We characterized isolated spiral galaxies as a reference for the properties of interacting ones: we selected all the spirals in CfA catalog with mB ≤ 13.0,δ ≥ 0, a≤ 4′ and 73° > i > 32°. The isolated ones were those having no companions in ΔD≤0.5Mpc and ΔV≤500 km/s and no satellites galaxies in their neighborhood (from Nilson catalog and Palomar charts). To select the isolated pairs of spirals we used Karachentsev's catalog applying similar conditions for mB, δ, a, i and the same isolation criteria. We used broad band CCD images (Johnson B,V e I), narrow band CCD images (Hα) and long sli

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van Driel, Wim, and Bert van den Broek. "Barred Extreme IRAS Galaxies." International Astronomical Union Colloquium 157 (1996): 256–58. http://dx.doi.org/10.1017/s0252921100049897.

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AbstractWe studied a statistically complete sample of 57 southern socalled extreme IRAS galaxies, i.e., objects with a high far-infrared/blue luminosity ratio, LFIR/LB>3, using optical (imaging and spectra), radio continuum, and CO(1–0) line observations. The sample can be divided into three distinct categories: dwarfs (20%), barred spirals (35%), and interacting systems (35%). The barred galaxies are generally morphologically undisturbed, isolated systems, with average star formation rates (4 M⊙ yr–1) and efficiencies (LFIR/MH2 = 16 L⊙/M⊙) for galaxies in our sample. An enhanced massive st

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Koopmann, Rebecca A., and Jeffrey D. P. Kenney. "Star Formation Along the Bars of Virgo Cluster and Isolated Spiral Galaxies." International Astronomical Union Colloquium 157 (1996): 105–7. http://dx.doi.org/10.1017/s025292110004954x.

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Star formation along the bar is common in late-type barred galaxies (Phillips and Garcia-Barreto et al., these proceedings), which tend to have weak stellar bars. It is rarer in strongly barred galaxies, e.g., early-type spiral galaxies. Abundance gradient measurements (Martin & Roy 1995) and simulations (Friedli & Benz 1995) suggest that star formation along the bar of strongly barred galaxies may indicate a young bar. Since bars can be created in tidal interactions and mergers (Noguchi 1987), it is of interest to investigate the star formation properties of barred galaxies in differe

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Argudo-Fernández, M., I. Lacerna, and S. Duarte Puertas. "The dependence of mass and environment on the secular processes of AGNs in terms of morphology, colour, and specific star-formation rate." Astronomy & Astrophysics 620 (December 2018): A113. http://dx.doi.org/10.1051/0004-6361/201833328.

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Context. Galaxy mass and environment play a major role in the evolution of galaxies. In the transition from star-forming to quenched galaxies, active galactic nuclei (AGNs) also have a principal action therein. However, the connections between these three actors are still uncertain. Aims. In this work we investigate the effects of stellar mass and the large-scale structure (LSS) environment on the fraction of optical nuclear activity in a population of isolated galaxies, where AGN would not be triggered by recent galaxy interactions or mergers. Methods. As a continuation of a previous work, we

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Steffen, Joshua L., Hai Fu, Joel R. Brownstein, et al. "SDSS-IV MaNGA: How Galaxy Interactions Influence Active Galactic Nuclei." Astrophysical Journal 942, no. 2 (2023): 107. http://dx.doi.org/10.3847/1538-4357/aca768.

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Abstract We present a comparative study of active galactic nuclei (AGN) between galaxy pairs and isolated galaxies with the final data release of the MaNGA integral field spectroscopic survey. We build a sample of 391 kinematic galaxy pairs within the footprint of the survey and select AGN using the survey's spectra. We use the comoving volume densities of the AGN samples to quantify the effects that tidal interactions have on the triggering of nuclear accretion. Our hypothesis is that the pair sample contains AGN that are triggered by not only stochastic accretion but also tidally induced acc

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Repetto, P., M. Rosado, R. Gabbasov, and I. Fuentes-Carrera. "KPG 390: A pair of trailing spirals." Proceedings of the International Astronomical Union 6, S271 (2010): 127–34. http://dx.doi.org/10.1017/s1743921311017534.

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AbstractIn this study we present scanning Fabry-Perot Hα observations of the isolated interacting galaxy pair NGC 5278/79. We derived velocity fields, various kinematic parameters and rotation curves for both galaxies. These kinematical results together with the fact that dust lanes have been detected in both galaxies, as well as the analysis of surface brightness profiles along the minor axis, allowed us to determine univocally that both components of the interacting pair are trailing spirals. We have also estimated the mass of NGC 5278 fitting its rotation curve with a disk-halo component. W

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Mazzei, P., R. Rampazzo, A. Marino, G. Trinchieri, M. Uslenghi, and A. Wolter. "Insights into the Evolution of Five Isolated Galaxies." Astrophysical Journal 927, no. 1 (2022): 124. http://dx.doi.org/10.3847/1538-4357/ac4808.

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Abstract Galaxy evolution is believed to be conditioned by the environment. Isolated galaxies or galaxies in poor groups are an excellent laboratory to study evolutionary mechanisms where effects of the environment are minimal. We present new Swift-UVOT data in six filters, three in the ultraviolet (UV), of five isolated galaxies aiming at shedding light into their evolution. For all of our targets, we present new UV integrated fluxes, and for some of them also new UBV magnitudes. Our observations allow us to improve their multiwavelength spectral energy distributions, extending them over abou

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Verheijen, Marc, and Brent Tully. "A dichotomy between HSB and LSB galaxies." International Astronomical Union Colloquium 171 (1999): 92–101. http://dx.doi.org/10.1017/s0252921100054166.

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AbstractA complete sample of spiral galaxies in the Ursa Major cluster is imaged at various optical wavelengths and in the Near-Infrared K′-band. HI rotation curves were obtained for all gas rich systems. The Near-Infrared surface brightness distribution of disk galaxies turns out to be bimodal; galaxies avoid a domain around mag/arcsec2. This bimodality is particularly striking when only the more isolated, non-interacting systems are considered. The Luminosity Function of the HSB family of galaxies is truncated well above the completion limit while the Luminosity Function of the LSB family is

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Kenney, Jeffrey, and Rebecca Koopmann. "Environmental Extremists in the Virgo Cluster." Symposium - International Astronomical Union 186 (1999): 387–92. http://dx.doi.org/10.1017/s0074180900113166.

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Many types of galaxy interactions have been posited to occur in clusters, although it remains unclear which processes actually occur, and which ones might help explain the tendency for early type galaxies to inhabit high density environments, or cause the rapid evolution of cluster galaxies (e.g., Dressler et al. 1997). With these questions in mind, we have been conducting an environmental inventory of galaxies in the Virgo Cluster. Our approach is to combine surveys of spirals and S0s with detailed studies of the most interesting and peculiar galaxies. In this paper, we describe two main poin

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Kopenhafer, Claire, Brian W. O’Shea, and G. Mark Voit. "Seeking Self-regulating Simulations of Idealized Milky Way–like Galaxies." Astrophysical Journal 951, no. 2 (2023): 107. http://dx.doi.org/10.3847/1538-4357/accbb7.

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Abstract Precipitation is potentially a mechanism through which the circumgalactic medium (CGM) can regulate a galaxy’s star formation. Here, we present idealized simulations of isolated Milky Way–like galaxies intended to examine the ability of galaxies to self-regulate their star formation, in particular via precipitation. We also examine the impact of rotation in the CGM. Using six simulations, we explore variations in the initial CGM t cool/t ff ratio and rotation profile. Those variations affect the amount of gas accretion and star formation within the galactic disk. To encourage this acc

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Pfefferkorn, F., Th Boller, and P. Rafanelli. "Soft X-ray properties of a spectroscopically selected sample of interacting and isolated Seyfert galaxies." Astronomy & Astrophysics 368, no. 3 (2001): 797–816. http://dx.doi.org/10.1051/0004-6361:20010055.

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