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Journal articles on the topic 'AGN activity'

Author: Grafiati

Published: 26 June 2021

Last updated: 29 July 2025

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1

Amiri, Amirnezam. "Role of environment on AGN activity." Proceedings of the International Astronomical Union 15, S356 (2019): 171. http://dx.doi.org/10.1017/s1743921320002835.

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AbstractMotivated by the apparently conflicting results reported in the literature on the effect of environment on nuclear activity, we have carried out a new analysis by comparing the fraction of galaxies hosting active galactic nuclei (AGNs) in the most overdense regions (rich galaxy clusters) and the most underdense ones (voids) in the local universe. Exploiting the classical BPT diagnostics, we have extracted volume limited samples of star forming and AGN galaxies. We find that, at variance with star-forming galaxies, AGN galaxies have similar distributions of specific star formation rates

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Li, Cheng, Guinevere Kauffmann, Timothy M. Heckman, Simon D. M. White, and Y. P. Jing. "Interactions, star formation and AGN activity." Monthly Notices of the Royal Astronomical Society 385, no. 4 (2008): 1915–22. http://dx.doi.org/10.1111/j.1365-2966.2008.13023.x.

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Umemura, Masayuki, Jun Fukue, and Shin Mineshige. "AGN activity triggered by circumnuclear starbursts." Advances in Space Research 23, no. 5-6 (1999): 1095–100. http://dx.doi.org/10.1016/s0273-1177(99)00238-0.

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Man, Zhong-yi, Ying-jie Peng, Xu Kong, Ke-xin Guo, Cheng-peng Zhang, and Jing Dou. "The dependence of AGN activity on environment in SDSS." Monthly Notices of the Royal Astronomical Society 488, no. 1 (2019): 89–98. http://dx.doi.org/10.1093/mnras/stz1706.

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ABSTRACT Environment is one of the key external drivers of the galaxies, while active galactic nucleus (AGN) is one of the key internal drivers. Both of them play fundamental roles in regulating the formation and evolution of galaxies. We explore the interrelationship between environment and AGN in SDSS. At a given stellar mass, the specific star formation rate distribution of the AGN host galaxies remains unchanged with overdensity, with the peak of the distribution around the Green Valley. We show that, at a given stellar mass, the AGN fraction that has been commonly used in previous studies

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Noordeh, E., R. E. A. Canning, A. King, et al. "The environmental dependence of X-ray AGN activity at z ∼ 0.4." Monthly Notices of the Royal Astronomical Society 498, no. 3 (2020): 4095–108. http://dx.doi.org/10.1093/mnras/staa2682.

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ABSTRACT We present an analysis of the X-ray active galactic nucleus (AGN) population in a sample of seven massive galaxy clusters in the redshift range 0.35 &lt; z &lt; 0.45. We utilize high-quality Chandra X-ray imaging to robustly identify AGN and precisely determine cluster masses and centroids. Follow-up VIsible Multi-Object Spectrograph optical spectroscopy allows us to determine which AGN are cluster members. Studying the subset of AGN with 0.5–8 keV luminosities &gt;6.8 × 1042 erg s−1, within r ≤ 2r500 (approximately the virial radius), we find that the cluster AGN space de

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Martín-Navarro, Ignacio, Francesco Shankar, and Mar Mezcua. "Rejuvenation triggers nuclear activity in nearby galaxies." Monthly Notices of the Royal Astronomical Society: Letters 513, no. 1 (2021): L10—L14. http://dx.doi.org/10.1093/mnrasl/slab112.

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ABSTRACT Feedback, in particular from active galactic nuclei (AGNs), is believed to play a crucial role in the evolution of galaxies. In the local Universe, many galaxies with an AGN are indeed observed to reside in the so-called green valley, usually interpreted as a transition phase from a blue star-forming to a red quenched state. We use data from the Sloan Digital Sky Survey to show that such an interpretation requires substantial revision. Optically selected nearby AGN galaxies follow exponentially declining star formation histories, as normal galaxies of similar stellar and dark matter h

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González Delgado, R. M., C. N. Tadhunter, E. Pérez, M. Villar-Martín, J. Holt, and J. Rodríguez. "The relation between mergers and AGN activity." Astronomische Nachrichten 327, no. 2-3 (2006): 159–66. http://dx.doi.org/10.1002/asna.200510499.

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De Rosa, A., S. Bianchi, T. Bogdanović, et al. "Unveiling multiple AGN activity in galaxy mergers." Astronomische Nachrichten 338, no. 2-3 (2017): 262–68. http://dx.doi.org/10.1002/asna.201713340.

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Somboonpanyakul, T., M. McDonald, A. Noble, et al. "The Evolution of AGN Activity in Brightest Cluster Galaxies." Astronomical Journal 163, no. 4 (2022): 146. http://dx.doi.org/10.3847/1538-3881/ac5030.

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Abstract We present the results of an analysis of Wide-field Infrared Survey Explorer (WISE) observations of the full 2500 deg2 South Pole Telescope (SPT)-Sunyaev–Zel’dovich cluster sample. We describe a process for identifying active galactic nuclei (AGN) in brightest cluster galaxies (BCGs) based on WISE mid-IR color and redshift. Applying this technique to the BCGs of the SPT-SZ sample, we calculate the AGN-hosting BCG fraction, which is defined as the fraction of BCGs hosting bright central AGNs over all possible BCGs. Assuming an evolving single-burst stellar population model, we find sta

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Kristensen, Mikkel Theiss, Kevin A. Pimbblet, Brad K. Gibson, Samantha J. Penny, and Sophie Koudmani. "Merger Histories and Environments of Dwarf AGN in IllustrisTNG." Astrophysical Journal 922, no. 2 (2021): 127. http://dx.doi.org/10.3847/1538-4357/ac236d.

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Abstract The relationship between active galactic nuclei (AGN) activity and environment has been long discussed, but it is unclear if these relations extend into the dwarf galaxy mass regime—in part due to the limits in both observations and simulations. We aim to investigate if the merger histories and environments are significantly different between AGN and non-AGN dwarf galaxies in cosmological simulations, which may be indicative of the importance of these for AGN activity in dwarf galaxies, and whether these results are in line with observations. Using the IllustrisTNG flagship TNG100-1 r

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Santos, Daryl Joe D., Tomotsugu Goto, Seong Jin Kim, et al. "Environmental effects on AGN activity via extinction-free mid-infrared census." Monthly Notices of the Royal Astronomical Society 507, no. 2 (2021): 3070–88. http://dx.doi.org/10.1093/mnras/stab2352.

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ABSTRACT How does the environment affect active galactic nucleus (AGN) activity? We investigated this question in an extinction-free way by selecting 1120 infrared (IR) galaxies in the AKARI North Ecliptic Pole Wide field at redshift z ≤ 1.2. A unique feature of the AKARI satellite is its continuous nine-band IR filter coverage, providing us with an unprecedentedly large sample of IR spectral energy distributions (SEDs) of galaxies. By taking advantage of this, for the first time, we explored the AGN activity derived from SED modelling as a function of redshift, luminosity, and environment. We

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Paronyan, Gurgen M., Gohar S. Harutyunyan, and Areg M. Mickaelian. "Activity types for X-ray candidate AGN from SDSS." Proceedings of the International Astronomical Union 9, S304 (2013): 166–67. http://dx.doi.org/10.1017/s1743921314003664.

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AbstractThe Joint Catalogue of Hamburg ROSAT Sources (HRC/BHRC) is the result of merging of HRC and BHRC catalogs built on the basis of optical identifications of ROSAT BSC and ROSAT FSC. Altogether, 8132 sources are present. Based on this catalogue, we have compiled a sample of ROSAT AGN, including candidate ones. In this paper we classify candidate AGN (those that previously had not been spectroscopically classified) by their activity type. The sample contains 955 objects with count rate of photons CR>0.04 ct/s in the area with galactic latitudes |b|>30 and declinations δ>0, however

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Mickaelian, A. M., H. V. Abrahamyan, G. S. Harutyunyan, and G. M. Paronyan. "Revised activity types for Markarian galaxies." Proceedings of the International Astronomical Union 9, S304 (2013): 41–42. http://dx.doi.org/10.1017/s1743921314003263.

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AbstractThe sample of Markarian galaxies consists of 1515 UV-excess galaxies containing many active galaxies, both AGN and Starburst (SB). Several catalogs of Markarian galaxies have been published; however activity types are based on old spectroscopic data. The SDSS spectroscopy and some other recent spectral observations allow classify or re-classify many of Markarian galaxies, altogether we have retrieved and studied 779 SDSS and 300 other spectra. Out of 779 SDSS spectra, we have classified 533 HII, 31 Composites, 12 LINERs, 4 S2.0, 5 S1.9, 8 S1.8, 5 NLS1.5, 11 S1.5, 8 NLS1.2, 21 S1.2, 4 N

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Sani, Eleonora. "AGN/Starburst Connection." Acta Polytechnica CTU Proceedings 1, no. 1 (2014): 84–89. http://dx.doi.org/10.14311/app.2014.01.0084.

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Two main physical processes characterize the activity in the nuclear region of active galaxies: an intense star formation (starburst, SB) and an Active Galactic Nucleus (AGN). While the existence of a starburst-AGN connection is undisputed, still it is not clear which process dominates the energetic output in both local and high redshift Universe. Moreover there is no consensus on whether AGN fueling is synchronous with star formation or follows it during a post-starburst phase. Here I first review how to disentangle the relative SB-AGN contribution, then I focus on the physical and geometrica

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Ryu, Suji, Ha Yeon Lee, Seoul-Hee Nam, and Jong-Suep Baek. "Antifungal Activity of Angelica gigas with Enhanced Water Solubility of Decursin and Decursinol Angelate by Hot-Melt Extrusion Technology against Candida albicans." International Journal of Translational Medicine 2, no. 4 (2022): 515–21. http://dx.doi.org/10.3390/ijtm2040038.

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Hot-melt extrusion (HME) has been an alternative technique to improve the solubility and bioavailability of active molecules with low water solubility. In this study, HME-Angelica gigas Nakai (AGN) was prepared to increase the aqueous solubility of decursin (D) and decursinol angelate (DA), the active ingredients of AGN. Compared with unprocessed AGN, HME-AGN showed enhanced water solubility of D and DA. The HME-AGN exhibited improved antioxidant activity by the DPPH radical scavenging method. The antifungal activity was confirmed against Candida albicans (C. albicans). There was a decrease in

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Poggianti, Bianca M., Callum Bellhouse, Tirna Deb, et al. "The role of environment on quenching, star formation and AGN activity." Proceedings of the International Astronomical Union 15, S359 (2020): 108–16. http://dx.doi.org/10.1017/s1743921320002070.

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AbstractGalaxies undergoing ram pressure stripping in clusters are an excellent opportunity to study the effects of environment on both the AGN and the star formation activity. We report here on the most recent results from the GASP survey. We discuss the AGN-ram pressure stripping connection and some evidence for AGN feedback in stripped galaxies. We then focus on the star formation activity, both in the disks and the tails of these galaxies, and conclude drawing a picture of the relation between multi-phase gas and star formation.

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Farrah, D., J. Afonso, A. Efstathiou, M. Rowan-Robinson, M. Fox, and D. Clements. "Starburst and AGN activity in ultraluminous infrared galaxies." Monthly Notices of the Royal Astronomical Society 343, no. 2 (2003): 585–607. http://dx.doi.org/10.1046/j.1365-8711.2003.06696.x.

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Blank, Marvin, and Wolfgang J. Duschl. "Viscous time lags between starburst and AGN activity." Monthly Notices of the Royal Astronomical Society 462, no. 2 (2016): 2246–55. http://dx.doi.org/10.1093/mnras/stw1804.

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Foord, Adi, Elena Gallo, Edmund Hodges-Kluck, et al. "AGN Activity in Nucleated Galaxies as Measured byChandra." Astrophysical Journal 841, no. 1 (2017): 51. http://dx.doi.org/10.3847/1538-4357/aa6d63.

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Schmidt, Gary D. "Ubiquitous Disks in AGN." International Astronomical Union Colloquium 163 (1997): 152–61. http://dx.doi.org/10.1017/s0252921100042597.

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AbstractDisk-like structures have been inferred to exist in the nuclei of galaxies over the entire range in nuclear activity. These form the essence of the Unified Scheme, which has had great success in accounting for AGN of a wide variety of perceived types. Recent progress along this front is summarized, including new polarimetric results, high-angular resolution optical imaging, and interferometry at radio wavelengths.

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Qu, Weikun, Peng Ji, Xibin Han, Xianglong Wang, Yang Li, and Jin Liu. "Highly Biocompatible Apigenin-Loaded Silk Fibroin Nanospheres: Preparation, Characterization, and Anti-Breast-Cancer Activity." Polymers 15, no. 1 (2022): 23. http://dx.doi.org/10.3390/polym15010023.

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Breast cancer is among the most common fatal diseases among women. Low-toxicity apigenin (AGN) is of interest due to its good antitumor activity, but its clinical application is severely limited due to its poor water solubility and low bioavailability. An effective strategy to enhance the anti-breast-cancer activity of AGN is to develop it as a nanodelivery system. Silk fibroin (SF) is an ideal drug carrier with good biocompatibility, biodegradability, and a simple extraction process. This paper develops a novel and efficient apigenin-loaded silk fibroin nanodelivery system (SF-AGN) by nanopre

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Wang, Kunjie, Yanping Wu, Hongxia Li, et al. "Synthesis, characterization and antimicrobial activity of silver nanoparticles: Agn(NALC)m and Agn(GSHR)m." RSC Advances 4, no. 10 (2014): 5130. http://dx.doi.org/10.1039/c3ra46568c.

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23

Florez, Jonathan, Shardha Jogee, Sydney Sherman, et al. "Exploring AGN and star formation activity of massive galaxies at cosmic noon." Monthly Notices of the Royal Astronomical Society 497, no. 3 (2020): 3273–96. http://dx.doi.org/10.1093/mnras/staa2200.

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ABSTRACT We investigate the relation between active galactic nucleus (AGN) and star formation (SF) activity at 0.5 &lt; z &lt; 3 by analysing 898 galaxies with X-ray luminous AGNs (LX &gt; 1044 erg s−1) and a large comparison sample of ∼320 000 galaxies without X-ray luminous AGNs. Our samples are selected from a large (11.8 deg2) area in Stripe 82 that has multiwavelength (X-ray to far-IR) data. The enormous comoving volume (∼0.3 Gpc3) at 0.5 &lt; z &lt; 3 minimizes the effects of cosmic variance and captures a large number of massive galaxies (∼30 000 galaxies with M* &am

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Kharb, Preeti, and Sasikumar Silpa. "Looking for Signatures of AGN Feedback in Radio-Quiet AGN." Galaxies 11, no. 1 (2023): 27. http://dx.doi.org/10.3390/galaxies11010027.

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In this article, we discuss the state of “AGN feedback” in radio-quiet (RQ) AGN. This study involves heterogeneous samples of nearby Seyfert and LINER galaxies as well as quasi-stellar objects (QSOs) that have been observed at low radio frequencies (few ∼100 MHz) with the upgraded Giant Meterwave Radio Telescope (GMRT) and ∼GHz frequencies with the Karl G. Jansky Very Large Array (VLA) and Very Long Baseline Array (VLBA). These multi-frequency, multi-resolution observations detect a range of arcsecond-scale radio spectral indices that are consistent with the presence of multiple contributors i

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Rubinur, K. "AGN Feedback Signatures in UV Emission." Galaxies 12, no. 2 (2024): 15. http://dx.doi.org/10.3390/galaxies12020015.

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Supermassive black holes (SMBH) are believed to influence galaxy evolution through AGN (active galactic nuclei) feedback. Galaxy mergers are key processes of galaxy formation that lead to AGN activity and star formation. The relative contribution of AGN feedback and mergers to star formation is not yet well understood. In radio-loud objects, AGN outflows are dominated by large jets. However, in radio-quiet objects, outflows are more complex and involve jet, wind, and radiation. In this review, we discuss the signatures of AGN feedback through the alignment of radio and UV emissions. Current re

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Filho, Mercedes E., Jarle Brinchmann, Catarina Lobo, and Sonia Antón. "Optically faint radio sources: reborn AGN?" Proceedings of the International Astronomical Union 7, S284 (2011): 231–33. http://dx.doi.org/10.1017/s174392131200912x.

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AbstractWe have discovered eight relatively strong radio sources that have no optical counterparts. A NIR follow-up has detected faint (17–20 mag) host galaxies in all targets. In general, the radio properties are similar to those observed in 3CRR sources but the optical-radio slopes are consistent with moderate to high redshift (z < 4) GHz-peaked spectrum sources. Our results suggest that these are galaxies whose black hole has been recently re-ignited into activity but that retain large-scale radio structures, signatures of previous AGN activity.

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Pović, Mirjana. "Development in astronomy in Ethiopia and East-Africa through nuclear activity in galaxies." Proceedings of the International Astronomical Union 15, S356 (2019): 3–8. http://dx.doi.org/10.1017/s174392132000246x.

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AbstractIn this paper we summarise the research that is currently going on in Ethiopia and East-Africa in extragalactic astronomy and physics of active galaxies and active galactic nuclei (AGN). The study is focused on some of the still open questions such as: what are the stellar ages and populations of ultra hard X-ray detected AGN and connection between AGN and their host galaxies?, what are the properties of AGN in galaxy clusters and the role that environment has in triggering nuclear activity?, what are the morphological properties of AGN and how precisely we can deal with morphological

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Greenhill, L. J. "Masers in AGN environments." Proceedings of the International Astronomical Union 3, S242 (2007): 381–90. http://dx.doi.org/10.1017/s1743921307013439.

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AbstractGalactic nuclei are well known sources of OH and H2O maser emission. It appears that intense star formation in ultra-luminous infrared galaxies drives most OH sources. In contrast, nuclear activity appears to drive most H2O sources. When H2O emission originates in accretion disk structures, constrained geometry and dynamics enable robust interpretation of spectroscopic and imaging data. The principal science includes study of AGN geometry at parsec and sub-parsec radii and measurement of geometric distances in the Hubble Flow. New high accuracy estimates of the “Hubble constant, H○” ob

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Barrows, R. Scott, Julia M. Comerford, Daniel Stern, and Roberto J. Assef. "A Catalog of Host Galaxies for WISE-selected AGN: Connecting Host Properties with Nuclear Activity and Identifying Contaminants." Astrophysical Journal 922, no. 2 (2021): 179. http://dx.doi.org/10.3847/1538-4357/ac1352.

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Abstract We present a catalog of physical properties for galaxies hosting active galactic nuclei (AGN) detected by the Wide-field Infrared Survey Explorer (WISE). By fitting broadband spectral energy distributions of sources in the WISE AGN Catalog with empirical galaxy and AGN templates, we derive photometric redshifts, AGN bolometric luminosities, measures of AGN obscuration, host galaxy stellar masses, and host galaxy star formation rates (SFRs) for 695,273 WISE AGN. The wide-area nature of this catalog significantly augments the known number of obscured AGN out to redshifts z ∼ 3 and will

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Levenson, N. A. "Compton Thick AGN." Proceedings of the International Astronomical Union 9, S304 (2013): 112–18. http://dx.doi.org/10.1017/s1743921314003512.

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AbstractCompton thick active galactic nuclei (AGN), which are obscured by column density NH > 1.5 × 104 cm−2, can be difficult to identify. They are certainly cosmically significant, both in producing the observed cosmic X-ray background, and in providing a location where black hole growth is hidden from view. Here I review some recent results from surveys that provide indications of Compton thick AGN, considering X-ray, radio, and infrared selection techniques. I also offer a caution against using mid-infrared silicate features to measure line-of-sight obscuration to active galactic nuclei

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Koulouridis, Elias. "The AGN dependence on cluster mass." Proceedings of the International Astronomical Union 14, S342 (2018): 145–48. http://dx.doi.org/10.1017/s1743921318005124.

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AbstractWe present the results of a study of the AGN density in a homogeneous and well studied sample of 167 bona-fide X-ray galaxy clusters (0.1<z<0.5). Our aim is to study the AGN activity in 167 XXL X-ray galaxy clusters as a function of the cluster mass and the location of the AGN in the cluster. We report a significant AGN excess in our low-mass cluster sub-sample between 0.5r500 and 2r500. In contrast, the high-mass sub-sample presents no AGN excess. The AGN excess in poor clusters indicates AGN triggering, supporting previous studies that reported enhanced galaxy merging in the cl

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Weaver, Kimberly A., Jenna M. Cann, Lynne Valencic та ін. "Kiloparsec-scale Neutral Iron Kα Emission in the Starburst-AGN NGC 4945: A Relic AGN Outflow?" Astrophysical Journal 985, № 1 (2025): 91. https://doi.org/10.3847/1538-4357/adc1ce.

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Abstract NGC 4945 contains a well-known heavily obscured active galactic nucleus (AGN) at its core, with prior reports of strong nuclear and off-nuclear neutral Fe Kα emission due to the AGN activity. We report the discovery of very extended Fe Kα emission with the XMM-Newton EPIC pn in a ∼5 kpc by ∼10 kpc region that is misaligned with the plane of the inclined optical galactic disk by ∼60° in projection. After a careful consideration of the crowded center of the galaxy and numerous unresolved hard X-ray sources present, we estimate that ∼15% of the Fe Kα is extended on kiloparsec-sized scale

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McKernan, B., K. E. S. Ford, and C. S. Reynolds. "Black hole mass, host galaxy classification and AGN activity." Monthly Notices of the Royal Astronomical Society 407, no. 4 (2010): 2399–410. http://dx.doi.org/10.1111/j.1365-2966.2010.17068.x.

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Fanidakis, N., C. M. Baugh, A. J. Benson та ін. "Grand unification of AGN activity in the ΛCDM cosmology". Monthly Notices of the Royal Astronomical Society 410, № 1 (2010): 53–74. http://dx.doi.org/10.1111/j.1365-2966.2010.17427.x.

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Miraghaei, H., H. G. Khosroshahi, H. R. Klöckner, T. J. Ponman, N. N. Jetha, and S. Raychaudhury. "IGM Heating and AGN activity in Fossil Galaxy Groups." Proceedings of the International Astronomical Union 9, S304 (2013): 349–50. http://dx.doi.org/10.1017/s174392131400427x.

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AbstractFossil galaxy groups are energetically and morphologically ideal environments to study the intergalactic medium (IGM) heating, because their inter-galactic gas is undisturbed due to the lack of recent group scale mergers. We study the role of active galactic nuclei (AGN) in heating the IGM in a sample of five fossil galaxy groups by employing properties at 610 MHz and 1.4 GHz. We find that two of the dominant galaxies in fossil groups, ESO 3060170 and RX J1416.4+2315, are associated with the radio lobes. We evaluate the PdV work of the radio lobes and their corresponding heating power

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Richards, A. M. S., J. H. Knapen, J. A. Yates, et al. "OH Megamasers, Starburst and AGN Activity in Markarian 231." Monthly Notices of the Royal Astronomical Society 364, no. 2 (2005): 353–66. http://dx.doi.org/10.1111/j.1365-2966.2005.09588.x.

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Abrahamyan, Hayk V., and Areg M. Mickaelian. "Radio Properties of AGN." Proceedings of the International Astronomical Union 9, S304 (2013): 102–3. http://dx.doi.org/10.1017/s1743921314003469.

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AbstractTo study the radio properties of AGN, we cross-correlate and investigate Veron-Cetty & Veron catalog of QSOs and Active Galaxies (v.13, 2010) with a number of radio catalogs: NVSS, FIRST, GB6, 87GB, SUMSS, WISH, WENSS, and 7C. This catalog contains 168,940 objects with positional accuracy of mostly 1 arcsec, though many positions have larger errors. We use new cross-correlation software based on accuracy of each object independently. In this software we take into account errors for each source and take identifications with errors within 3 sigma. Altogether, we find ~16,000 AGN havi

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Torbaniuk, O., M. Paolillo, F. Carrera, et al. "The connection between star formation and supermassive black hole activity in the local Universe." Monthly Notices of the Royal Astronomical Society 506, no. 2 (2021): 2619–37. http://dx.doi.org/10.1093/mnras/stab1794.

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ABSTRACT We study the nuclear (AGN) activity in the local Universe (z &lt; 0.33) and its correlation with the host galaxy properties, derived from a Sloan Digital Sky Survey sample with spectroscopic star-formation rate (SFR) and stellar mass determination. To quantify the level of AGN activity we used the XMM-Newton Serendipitous Source Catalogue. Applying multiwavelength selection criteria (optical BPT-diagrams, X-ray/optical ratio etc), we found that 24 per cent of the detected sources are efficiently-accreting AGN with moderate-to-high X-ray luminosity, twice as likely to be hosted by

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Lee, Hyo Jeong, Hyo Jung Lee, Eun Ok Lee, et al. "In vivo Anti-Cancer Activity of Korean Angelica Gigas and its Major Pyranocoumarin Decursin." American Journal of Chinese Medicine 37, no. 01 (2009): 127–42. http://dx.doi.org/10.1142/s0192415x09006722.

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We have reported that a 10-herbal traditional formula containing Korean Angelica gigas Nakai (AGN) exerts potent anti-cancer efficacy and identified decursin and decursinol angelate (DA) from AGN as novel anti-androgens. Here, we determined whether AGN would exert in vivo anti-cancer activity and whether decursin or DA could account for its efficacy. The AGN ethanol extract was tested against the growth of mouse Lewis lung cancer (LLC) allograft in syngenic mice or human PC-3 and DU145 prostate cancer xenograft in immunodeficient mice. The pharmacokinetics of decursin and DA were determined. T

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Tiwari, Juhi, Ming Sun, Rongxin Luo, Matteo Fossati, Chen Chien-Ting J., and Prathamesh Tamhane. "Can Active Galactic Nuclei Activity Be Enhanced by Ram Pressure Stripping?—X-Ray Perspective." Astrophysical Journal 979, no. 2 (2025): 134. https://doi.org/10.3847/1538-4357/ad9b7f.

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Abstract Ram pressure stripping (RPS) is an important process that plays a significant role in shaping the evolution of cluster galaxies and their surrounding environment. Despite its recognized significance, the potential connection between RPS and active galactic nuclei (AGN) activity in cluster galaxies remains poorly understood. Recent claims, based on optical emission-line diagnostics, have suggested such a connection. Here, we investigate this relationship from an X-ray perspective, using a sample of galaxies undergoing RPS in four nearby galaxy clusters: A1656, A1367, A426, and A3627. T

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Suresh, Arjun, and Michael R. Blanton. "Radio Active Galactic Nuclei Activity in Low Redshift Galaxies Is Not Directly Related to Star Formation Rates." Astrophysical Journal 977, no. 2 (2024): 194. https://doi.org/10.3847/1538-4357/ad8ac7.

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Abstract We examine the demographics of radio-emitting active galactic nuclei (AGN) in the local Universe as a function of host galaxy properties, most notably both stellar mass (M ⋆) and star formation rate (SFR). Radio AGN activity is theoretically implicated in helping reduce the SFR of galaxies, and therefore it is natural to investigate the relationship between these two galaxy properties. We use the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) optical IFU catalog in conjunction with the NVSS and Faint Images of the Radio Sky at Twenty radio catalogs. MaNGA's high precision

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Hickox, Ryan C., Stephanie M. LaMassa, John D. Silverman, and Alexander Kolodzig. "Host galaxies and large-scale structures of active galactic nuclei." Proceedings of the International Astronomical Union 11, A29B (2015): 113–23. http://dx.doi.org/10.1017/s1743921316004592.

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AbstractOur understanding of the cosmic evolution of supermassive black holes (SMBHs) has been revolutionized by the advent of large multiwavelength extragalactic surveys, which have enabled detailed statistical studies of the host galaxies and large-scale structures of active galactic nuclei (AGN). We give an overview of some recent results on SMBH evolution, including the connection between AGN activity and star formation in galaxies, the role of galaxy mergers in fueling AGN activity, the nature of luminous obscured AGN, and the connection between AGN and their host dark matter halos. We co

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Puccetti, S., F. Fiore, A. Bongiorno, K. Boutsia, R. Fassbender, and M. Verdugo. "Triggering nuclear and galaxy activity in the Bullet cluster." Astronomy & Astrophysics 634 (February 2020): A137. http://dx.doi.org/10.1051/0004-6361/201833601.

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The analysis of a cluster environment is a valuable instrument to investigate the origin of gas fuelling and trigger mechanisms in active galactic nuclei (AGN) and star-forming galaxies. To this purpose, we present a detailed analysis of the point-like X-ray sources in the Bullet cluster field. Based on ∼600 ks Chandra observations, we produced a catalogue of 381 X-ray point sources up to a distance of ∼1.5 virial radius and with flux limits ∼1 × 10−16 and ∼8 × 10−16 erg cm−2 s−1 in the 0.5–2 keV and 2–10 keV bands, respectively. We find a strong (up to a factor 1.5–2) and significant (≥4σ) ov

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Zubovas, Kastytis. "AGN activity and nuclear starbursts: Sgr A* activity shapes the Central Molecular Zone." Monthly Notices of the Royal Astronomical Society 451, no. 4 (2015): 3627–42. http://dx.doi.org/10.1093/mnras/stv1173.

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Travascio, A., A. Bongiorno, P. Tozzi, et al. "Multiple AGN activity during the BCG assembly of XDCPJ0044.0-2033 at z ∼ 1.6." Monthly Notices of the Royal Astronomical Society 498, no. 2 (2020): 2719–33. http://dx.doi.org/10.1093/mnras/staa2495.

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ABSTRACT Undisturbed galaxy clusters are characterized by a massive and large elliptical galaxy at their centre, i.e. the brightest cluster galaxy (BCG). How these central galaxies form is still debated. According to most models, a typical epoch for their assembly is $z$ ∼ 1–2. We have performed a detailed multiwavelength analysis of the core of XMM–Newton Distant Cluster Project (XDCP) J0044.0-2033 (XDCP0044), one of the most massive and densest galaxy clusters currently known at redshift $z$ ∼ 1.6, whose central galaxy population shows high star formation compared to lower z clusters and an

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Rosito, M. S., S. E. Pedrosa, P. B. Tissera, et al. "The role of AGN feedback in the structure, kinematics, and evolution of ETGs in Horizon simulations." Astronomy & Astrophysics 652 (August 2021): A44. http://dx.doi.org/10.1051/0004-6361/202039976.

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Context. Feedback processes play a fundamental role in the regulation of the star formation (SF) activity in galaxies and, in particular, in the quenching of early-type galaxies (ETGs) as has been inferred by observational and numerical studies of Λ-CDM models. At z = 0, ETGs exhibit well-known fundamental scaling relations, but the connection between scaling relations and the physical processes shaping ETG evolution remains unknown. Aims. This work aims to study the impact of the energetic feedback due to active galactic nuclei (AGN) on the formation and evolution of ETGs. We focus on assessi

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Bonzini, M., V. Mainieri, P. Padovani, et al. "Host galaxy properties of radio selected AGN." Proceedings of the International Astronomical Union 9, S304 (2013): 343–44. http://dx.doi.org/10.1017/s1743921314004244.

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AbstractWith the goal of investigating the link between black hole (BH) and star formation (SF) activity, we study a deep sample of radio selected star forming galaxies (SFGs) and active galactic nuclei (AGNs). Using a multi-wavelength approach we characterize their host galaxies properties (stellar masses, optical colors, and morphology). Moreover, comparing the star formation rate derived from the radio and far-infrared luminosity, we found evidences that the main contribution to the radio emission in the radio-quiet AGNs is star-formation activity in their host galaxy.

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French, K. Decker, Nicholas Earl, Annemarie B. Novack, et al. "Fading AGNs in Poststarburst Galaxies." Astrophysical Journal 950, no. 2 (2023): 153. http://dx.doi.org/10.3847/1538-4357/acd249.

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Abstract The role of active galactic nuclei (AGNs) in quenching galaxies and driving the evolution from star forming to quiescence remains a key question in galaxy evolution. We present evidence from the Mapping Nearby Galaxies at APO survey for fading AGN activity in 6/93 poststarburst galaxies. These six galaxies show extended emission line regions (EELRs) consistent with ionization from past AGN activity, analogous to “Hanny’s Voorwerp” and other systems where the [O iii] λ5007 emission is bright enough to be visible in broadband imaging. Using the infrared luminosities from IRAS to estimat

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Vergani, D., B. Garilli, M. Polletta, et al. "The VIMOS Public Extragalactic Redshift Survey (VIPERS)." Astronomy & Astrophysics 620 (December 2018): A193. http://dx.doi.org/10.1051/0004-6361/201732495.

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Aims. We analyse the properties of the host galaxies of a [NeV]-selected sample to investigate whether and how they are affected by the AGN. Methods. We have selected a sample of galaxies at 0.62 < z < 1.2 from the VIMOS Public Extragalactic Redshift Survey (VIPERS) and divided it in blue cloud galaxies, red passive galaxies and green valley galaxies using the NUVrK diagram. Within each category, galaxies with AGN activity were identified based on the detection of the high-ionisation [NeV]λ3426 emission line. For each galaxy we derived several properties (stellar age and mass, the (r−K)

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Stemo, Aaron, Julia M. Comerford, R. Scott Barrows, Daniel Stern, Roberto J. Assef, and Roger L. Griffith. "A Catalog of AGN Host Galaxies Observed with HST/ACS: Correlations between Star Formation and AGN Activity." Astrophysical Journal 888, no. 2 (2020): 78. http://dx.doi.org/10.3847/1538-4357/ab5f66.

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