Academic literature on the topic 'Galaxies'

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Journal articles on the topic "Galaxies"

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Guhathakurta, P., K. Ing, H. W. Rix, M. Colless, and T. Williams. "Spatially-Resolved Internal Kinematics of 〈z〉 ≈ 0.3 Field Galaxies: Evidence for Rotation." Symposium - International Astronomical Union 171 (1996): 385. http://dx.doi.org/10.1017/s0074180900233044.

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The nature of evolution in faint field galaxies remains a mystery. The Tully-Fisher relation, empirically relating the intrinsic luminosity of a spiral galaxy to its rotation speed, is an important tool for constraining the amount of luminosity evolution in distant field galaxies. Studying the luminosity-vs-linewidth relation for distant galaxies allows one to compare the luminosity of local and distant galaxies. The customary measure of a galaxy's rotation speed is the width of an emission line. It is important, however, to test whether the linewidth is a reliable measure of the galaxy's rota
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Bellovary, Jillian M., Sarra Hayoune, Katheryn Chafla, et al. "The origins of off-centre massive black holes in dwarf galaxies." Monthly Notices of the Royal Astronomical Society 505, no. 4 (2021): 5129–41. http://dx.doi.org/10.1093/mnras/stab1665.

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ABSTRACT Massive black holes often exist within dwarf galaxies, and both simulations and observations have shown that a substantial fraction of these may be off-centre with respect to their hosts. We trace the evolution of off-centre massive black holes (MBHs) in dwarf galaxies using cosmological hydrodynamical simulations, and show that the reason for off-centre locations is mainly due to galaxy–galaxy mergers. We calculate dynamical time-scales and show that off-centre MBHs are unlikely to sink to their galaxys’ centres within a Hubble time, due to the shape of the hosts’ potential wells and
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Miller, Tim B., and Pieter van Dokkum. "Bayesian Fitting of Multi-Gaussian Expansion Models to Galaxy Images." Astrophysical Journal 923, no. 1 (2021): 124. http://dx.doi.org/10.3847/1538-4357/ac2b30.

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Abstract Fitting parameterized models to images of galaxies has become the standard for measuring galaxy morphology. This forward-modeling technique allows one to account for the point-spread function to effectively study semi-resolved galaxies. However, using a specific parameterization for a galaxy’s surface brightness profile can bias measurements if it is not an accurate representation. Furthermore, it can be difficult to assess systematic errors in parameterized profiles. To overcome these issues we employ the Multi-Gaussian expansion (MGE) method of representing a galaxy’s profile togeth
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van Dokkum, Pieter, Zili Shen, Michael A. Keim, et al. "A trail of dark-matter-free galaxies from a bullet-dwarf collision." Nature 605, no. 7910 (2022): 435–39. http://dx.doi.org/10.1038/s41586-022-04665-6.

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AbstractThe ultra-diffuse galaxies DF2 and DF4 in the NGC 1052 group share several unusual properties: they both have large sizes1, rich populations of overluminous and large globular clusters2–6, and very low velocity dispersions that indicate little or no dark matter7–10. It has been suggested that these galaxies were formed in the aftermath of high-velocity collisions of gas-rich galaxies11–13, events that resemble the collision that created the bullet cluster14 but on much smaller scales. The gas separates from the dark matter in the collision and subsequent star formation leads to the for
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Graham, Alister W. "Resequencing the Hubble sequence and the quadratic (black hole mass)–(spheroid stellar mass) relation for elliptical galaxies." Monthly Notices of the Royal Astronomical Society 522, no. 3 (2023): 3588–601. http://dx.doi.org/10.1093/mnras/stad1124.

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ABSTRACT One of the most protracted problems in astronomy has been understanding the evolution of galaxy morphology. Much discussion has surrounded how lenticular galaxies may form a bridging population between elliptical and spiral galaxies. However, with recourse to a galaxy’s central black hole mass, accretion-built spiral galaxies have emerged as the bridging population between low-mass lenticular galaxies and the dusty merger-built lenticular galaxies contiguous with elliptical galaxies and ‘brightest cluster galaxies’ in the black hole/galaxy mass diagram. Spiral galaxies, including the
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Ludwig, Eric, Julia Falcone, Mariarosa Marinelli, William Ostling, and Charles T. Liu. "The Relation between Gas-phase Metallicity and Stellar Mass Surface Density in Post-starburst E+A and E+A+ Galaxies within the Coma Cluster Observed by the SDSS-IV MaNGA Survey." Research Notes of the AAS 6, no. 12 (2022): 259. http://dx.doi.org/10.3847/2515-5172/aca908.

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Abstract We present an analysis of the Mass–Metallicity Relation (MZR) in 29 post-starburst galaxies in the Coma Cluster. Outward from the central dominant galaxy, NGC 4889, we conducted a conical survey of all galaxies observed by the Sloan Digital Sky Survey Data Release 17 (SDSS DR17) Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey within a 5° radius and redshift constraints 0.013 < z < 0.033. We identified 21 E+A galaxies and 8 “E+A+ galaxies” whose spectra matched the criteria of an E+A galaxy, but contain Balmer emission lines, indicating star formation. We utili
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Douglass, Kelly A., and Regina Demina. "Dependence of the Ratio of Total to Visible Mass on Observable Properties of Sloan Digital Sky Survey MaNGA Galaxies." Astrophysical Journal 925, no. 2 (2022): 127. http://dx.doi.org/10.3847/1538-4357/ac3b56.

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Abstract Using spectroscopic observations from the Sloan Digital Sky Survey Mapping Nearby Galaxies at Apache Point Observatory Data Release 15, we study the relationships between the ratio of total to visible mass and various parameters characterizing the evolution and environment of the galaxies in this survey. Measuring the rotation curve with the relative velocities of the Hα emission line across a galaxy’s surface, we estimate each galaxy’s total mass. We develop a statistical model to describe the observed distribution in the ratio of total to visible mass, from which we extract the most
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Camps-Fariña, Artemi, Patricia Sánchez-Blázquez, Santi Roca-Fàbrega, and Sebastián F. Sánchez. "Variable metallicity yields as tracers of inflows." Proceedings of the International Astronomical Union 17, S373 (2021): 246–48. http://dx.doi.org/10.1017/s1743921322003982.

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AbstractPristine gas accretion is expected to be the main driver of sustained star formation in galaxies. We measure the required amount of accreted gas at each moment over a galaxy’s history to produce the observed metallicity at that time given its star-forming history. More massive galaxies tend to have higher accretion rates and a larger drop of the accretion rate towards the present time. Within the same mass bin galaxies that are currently star-forming or in the Green Valley have similar, sustained, accretion histories while retired galaxies had a steep decline in the past. Plotting the
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Jeon, Seyoung, Sukyoung K. Yi, Yohan Dubois, et al. "Star Formation History and Transition Epoch of Cluster Galaxies Based on the Horizon-AGN Simulation." Astrophysical Journal 941, no. 1 (2022): 5. http://dx.doi.org/10.3847/1538-4357/ac9d8c.

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Abstract Cluster galaxies exhibit substantially lower star formation rates than field galaxies today, but it is conceivable that clusters were sites of more active star formation in the early universe. Herein, we present an interpretation of the star formation history (SFH) of group/cluster galaxies based on the large-scale cosmological hydrodynamic simulation, Horizon-AGN. We find that massive galaxies in general have small values of e-folding timescales of star formation decay (i.e., “mass quenching”) regardless of their environment, while low-mass galaxies exhibit prominent environmental de
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Magrini, Laura, Mario Perinotto, Romano L. M. Corradi, and Antonio Mampaso. "A Search for Planetary Nebulae in M 33 and M 81." Symposium - International Astronomical Union 209 (2003): 559–60. http://dx.doi.org/10.1017/s0074180900209698.

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We present a study of the PNe systems of two nearby galaxies: the spirals M 33 and M 81. The luminosity functions (PNLFs) for the two PNe systems were built and the distances to both galaxies were given (0.84 ± 0.09 Mpc to M 33 and 3.84 ± 0.41 Mpc to M 81). The behavior of PNe excitation was examined across both galaxies, finding no evidence for substantial differences in excitation between bulge and disk PNe, nor for variations along the galaxian disks.
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Dissertations / Theses on the topic "Galaxies"

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Brouillet, Nathalie. "Contenu moléculaire de galaxies en interaction : la galaxie spirale Messier 81 et le groupe de galaxies de M81." Bordeaux 1, 1989. http://www.theses.fr/1989BOR10619.

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La distribution et l'abondance du gaz atomique et moleculaire dans les galaxies permettent l'etude de leur histoire et de la formation stellaire. Nous nous sommes interesses a la galaxie spirale messier 81, qui est consideree comme un prototype ideal pour tester la theorie des ondes de densite. Nous avons decouvert la presence d'une emission co dans m81 et une cartographie etendue a revele une deficience moleculaire au centre ainsi qu'une distribution annulaire. Des observations a plus haute resolution spatiale nous ont aussi permis de comparer les distributions relatives du co et d'autres tra
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Belfort, Patrick. "Proprietes infrarouges et optiques des galaxies iras : des galaxies normales aux galaxies a flambee." Paris 7, 1987. http://www.theses.fr/1987PA077184.

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Grace au satellite iras, on a decouvert un type de galaxies dont le rapport luminosite infrarouge sur bleue peut atteindre 100 ou plus; ces galaxies qu'on suppose subir des flambees de formation d'etoile sont l'objet de cette these. Un modele photometrique simple a ete construit pour rendre compte des proprietes ir lointain et optique de ces galaxies a flambees. La photometrie ccd d'un certain echantillon de galaxies iras a ete realisee pour tester le modele: l'accord modele-observation est satisfaisant et la force, ainsi que l'extinction des flambees ont pu etre estimees
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Belfort, Patrick. "Propriétés infrarouges et optiques des galaxies Iras des galaxies normales aux galaxies à flambée /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37602748s.

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Snaith, Owain N. "The environment of galaxies and groups of galaxies." Thesis, University of Central Lancashire, 2011. http://clok.uclan.ac.uk/2931/.

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In this thesis, we employ two numerical tools - semi- analytical models and N-body plus hydrodynamical simulations of large scale structure and individual galaxies - to explore the underlying physics governing the formation and evolution of groups of galaxies, and the role of environment in generating polar structures around disk galaxies. Using phenomenological models of baryonic physics imposed upon large-scale dissipationless simulations of the Universe, semi-analytic models (SAMs) are one of the principal methods used to model large samples of model galaxies. We sought to examine the prope
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Gruel, Nicolas. "Nature et formation des galaxies : les galaxies compactes lumineuses." Observatoire de Paris, 2002. https://hal.archives-ouvertes.fr/tel-02071406.

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L’évolution de la luminosité infrarouge et de l’UV peut s’expliquer par une chute de la formation stellaire entre les décalages spectraux de 0. 4 à 1, c’est-à-dire depuis 7 à 10 milliards d’années. Cette chute est due à deux types de galaxies : les galaxies infrarouges et les galaxies compactes lumineuses. Au cours de cette thèse, j’ai particulièrement étudié un échantillon de spectres de ces galaxies compactes observées au VLT. Ces objets sont très importants : il y a environ 7 milliards d’années ces galaxies représentaient la population dominante. De plus, malgré leur petite taille, elles ra
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Epinat, Benoit. "Des Galaxies Proches Aux Galaxies Lointaines: Etudes Cinématique et Dynamique." Phd thesis, Université de Provence - Aix-Marseille I, 2008. http://tel.archives-ouvertes.fr/tel-00413769.

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L'étude cinématique des galaxies locales et lointaines permet de contraindre les scénarios de formation et d'évolution des galaxies. Pour cela, la spectroscopie à champ intégral permet une étude détaillée de la cinématique des galaxies proches et fournit depuis peu des indices sur la cinématique des galaxies lointaines. Cette thèse s'appuie principalement sur l'utilisation de l'échantillon cinématique de galaxies locales GHASP. Cet échantillon de référence composé de 203 galaxies spirales et irrégulières de l'Univers local dans des environnements peu denses observées par interférométrie de Fab
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White, David Allen. "The multiphase medium of elliptical galaxies and clusters of galaxies." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240155.

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Epinat, Benoît. "Des galaxies proches aux galaxies lointaines : études cinématique et dynamique." Aix-Marseille 1, 2008. https://tel.archives-ouvertes.fr/tel-00413769v3.

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L’étude cinématique des galaxies locales et lointaines permet de contraindre les scénarios de formation et d’évolution des galaxies. Pour cela, la spectroscopie à champ intégral permet une étude détaillée de la cinématique des galaxies proches et fournit depuis peu des indices sur la cinématique des galaxies lointaines. Cette thèse s’appuie principalement sur l’utilisation de l’échantillon cinématique de galaxies locales GHASP. Cet échantillon de référence composé de 203 galaxies spirales et irrégulières de l’Univers local dans des environnements peu denses observées par interférométrie de Fab
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Lima-Neto, Gastao Bierrenbach. "Formation de galaxies elliptiques et structure des amas de galaxies." Paris 7, 1993. http://www.theses.fr/1993PA077317.

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Le theme de cette these est l'etude de la formation et de la structure de galaxies elliptiques au sein de groupes et amas de galaxies. Cette etude se divise selon deux approches principales: l'analyse des proprietes physiques et morphologiques de deux amas de galaxies, abell 85 et 2199 ; et l'etude numerique de la formation de galaxies elliptiques par coalescence de galaxies spirales. Les amas de galaxies ont ete analyses a partir de cliches pris par le detecteur ipc a bord du satellite einstein dans le domaine de rayonnement x. Le gaz intra-amas responsable de l'emission x est suppose etre en
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Chemin, Laurent. "Cinématique et dynamique de galaxies spirales." Paris 6, 2003. http://www.theses.fr/2003PA066052.

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Books on the topic "Galaxies"

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Parcerisa, Josep. Metro: Galàxies metropolitanes = galaxias metropolitanas = metropolitan galaxies. Edicions UPC, 2001.

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Simon, Seymour. Galaxies. Morrow Junior Books, 1988.

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Estalella, Robert. Galaxies. Barron's Educational Series, 1994.

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Consortium, ESNS, ed. Galaxies. ILEA Consortium, 1985.

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Simon, Seymour. Galaxies. Morrow Junior Books, 1988.

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World Book, Inc. Galaxies. World Book, 2010.

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Company, Addison-Wesley Publishing, ed. Galaxies. Addison-Wesley Publishers, 1993.

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Elish, Dan. Galaxies. Marshall Cavendish Benchmark, 2006.

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Trammel, Howard K. Galaxies. Children's Press, 2010.

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Sipiera, Paul P. Galaxies. Children's Press, 1997.

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Book chapters on the topic "Galaxies"

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Karttunen, Hannu, Pekka Kröger, Heikki Oja, Markku Poutanen, and Karl Johan Donner. "Galaxies." In Fundamental Astronomy. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05333-1_18.

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van der Kruit, P. C., G. A. Tammann, S. d’Odorico, et al. "Galaxies." In Reports on Astronomy. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2981-4_20.

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Inglis, Michael David. "Galaxies." In Field Guide to the Deep Sky Objects. Springer London, 2001. http://dx.doi.org/10.1007/978-1-4471-3680-4_5.

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Karttunen, Hannu, Pekka Kröger, Heikki Oja, Markku Poutanen, and Karl Johan Donner. "Galaxies." In Fundamental Astronomy. Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-662-11794-1_19.

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Bergeron, Jacqueline. "Galaxies." In Reports on Astronomy. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1100-3_20.

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West, Richard M. "Galaxies." In Reports on Astronomy. Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5392-5_20.

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Kitchin, Chris, and Robert W. Forrest. "Galaxies." In Seeing Stars. Springer London, 1998. http://dx.doi.org/10.1007/978-1-4471-0621-0_9.

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Parker, Barry. "Galaxies." In Colliding Galaxies. Springer US, 1990. http://dx.doi.org/10.1007/978-1-4899-3348-5_2.

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Inglis, Michael. "Galaxies." In The Patrick Moore Practical Astronomy Series. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11644-0_14.

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Karttunen, Hannu, Pekka Kröger, Heikki Oja, Markku Poutanen, and Karl Johan Donner. "Galaxies." In Fundamental Astronomy. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53045-0_19.

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Conference papers on the topic "Galaxies"

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Chugunov, I. V., and A. A. Marchuk. "Examination of azimuthally-averaged surface brightness profiles of the spiral arms using decomposition." In 51-st All-Russian with international participation student scientific conference "Physics of Space". Ural University Press, 2024. http://dx.doi.org/10.15826/b978-5-7996-3848-1.76.

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We analyze the contribution of spiral arms to the azimuthally-averaged surface brightness profiles of galaxies’ using results of the decomposition of 29 galaxies in the infrared. We show that spiral arms contribution to the galaxy luminosity varies strongly with the galac- tocentric distance. We obtain the characteristic values of the “bump” height on the galaxy’s azimuthally-averaged profile which is caused by the spiral arms. Our results can be applied for the rough estimates of axisymmetric components’ share in galaxy’s light, which is important for determination of disk parameters based on
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Holanda, João Pedro, Melissa Sales, Marcus Ferraz, and Roney Santos. "Morphological Classification of Galaxies with Different Grayscale Images Using Deep Learning." In Encontro Nacional de Inteligência Artificial e Computacional. Sociedade Brasileira de Computação - SBC, 2023. http://dx.doi.org/10.5753/eniac.2023.234521.

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In recent years, several images of galaxies have been collected by telescopes, so that they could be morphologically analyzed using artificial intelligence devices. Thus, this work aims to analyze new image processing approaches, using grayscale conversion algorithms, in order to explore their influence on CNN (Convolutional Neural Networks). Images from the Galaxies10 DECals dataset of two different types of galaxies were used, which were grayscaled and analyzed separately on the CNN. Aspects such as the influence of redshift and the average pixel value have been studied, since grayscale conv
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Blain, Andrew W. "Infrared galaxies." In COSMO--98. ASCE, 1999. http://dx.doi.org/10.1063/1.59389.

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Wyse, Rosemary F. G. "Normal galaxies." In Astrophysics from the Moon. AIP, 1990. http://dx.doi.org/10.1063/1.39329.

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Putman, Mary E., Jana Grcevich, J. E. G. Peek, Robert Minchin, and Emmanuel Momjian. "Feeding Galaxies." In THE EVOLUTION OF GALAXIES THROUGH THE NEUTRAL HYDROGEN WINDOW. AIP, 2008. http://dx.doi.org/10.1063/1.2973567.

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Muxlow, Tom W. B., R. J. Beswick, Anita Richards, and H. J. Thrall. "Starburst galaxies." In 8th European VLBI Network Symposium. Sissa Medialab, 2007. http://dx.doi.org/10.22323/1.036.0031.

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Sparks, William B. "Plasmas in Galaxies: Ionized Gas in Elliptical Galaxies." In PLASMAS IN THE LABORATORY AND IN THE UNIVERSE: New Insights and New Challenges. AIP, 2004. http://dx.doi.org/10.1063/1.1718470.

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Järvelä, Emilia, Anne Lähteenmäki, and Marco Berton. "Host galaxies of jetted narrow-line Seyfert 1 galaxies." In Revisiting narrow-line Seyfert 1 galaxies and their place in the Universe. Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.328.0046.

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Takagi, T. "Silicate-break galaxies." In THE SPECTRAL ENERGY DISTRIBUTIONS OF GAS-RICH GALAXIES: Confronting Models with Data; International Workshop. AIP, 2005. http://dx.doi.org/10.1063/1.1913947.

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Salvadori, Stefania, Andrea Ferrara, Daniel J. Whalen, Volker Bromm, and Naoki Yoshida. "The Faintest Galaxies." In THE FIRST STARS AND GALAXIES: CHALLENGES FOR THE NEXT DECADE. AIP, 2010. http://dx.doi.org/10.1063/1.3518849.

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Reports on the topic "Galaxies"

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España Fontán, Paula, and Maria Angeles Gomez Flechoso. Effects of the orbit orientation on the evolution of dwarf satellite galaxies. Fundación Avanza, 2023. http://dx.doi.org/10.60096/fundacionavanza/2492022.

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Cosmological models propose a hierarchical scenario for galaxy evolution, where dwarf galaxies are accreted in the halo of larger ones. We study the effect of the satellite’s orbital orientation on the planar alignment of satellite galaxies.
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Dey, A., J. Shields, and W. Van Breugel. Radio loud far-infrared galaxies. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/6850837.

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Избрехт, А. Р. COSMOLOGICAL REDSHIFT OF GALAXIES’ SPECTRA. DOI СODE, 2015. http://dx.doi.org/10.18411/doicode-2023.162.

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Blanton, Elizabeth L., T. E. Clarke, Craig L. Sarazin, Scott W. Randall, and Brian R. McNamara. AGN Feedback in Clusters of Galaxies. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada520956.

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Medoff, Jonah, Alex Drlica-Wagner, Burçin Mutlu-Pakdil, and Jeff Carlin. Detecting Dwarf Galaxies Around NGC 55. Office of Scientific and Technical Information (OSTI), 2023. http://dx.doi.org/10.2172/2212418.

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Springmann, Alessondra. Host Galaxies of X-Shaped Radio Sources. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/892607.

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Leung, Y., Y. Zhang, B. Yanny, et al. The Diffuse Light Envelope of Luminous Red Galaxies. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1637638.

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Rykoff, E. S. The L_X-M relation of Clusters of Galaxies. Office of Scientific and Technical Information (OSTI), 2008. http://dx.doi.org/10.2172/928354.

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Smullen, Rachel, and Soumi De. Black Holes, Crashing Galaxies, and Strange New Planets. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1787271.

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Dvorkin, Cora. Discovering Dark Matter Clumps and Primordial Particles with Galaxies. Office of Scientific and Technical Information (OSTI), 2024. https://doi.org/10.2172/2524057.

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