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Galaxy mergers are predicted to trigger accretion onto the central supermassive black holes, with the highest rates occurring during final coalescence. Previously, we have shown elevated rates of both optical and mid-IR selected active…

Astrophysics of Galaxies · Physics 2020-07-08 Nathan Secrest , Sara Ellison , Shobita Satyapal , Laura Blecha

The kinematic disturbances associated with major galaxy mergers are known to produce gas inflows, which in turn may trigger accretion onto the supermassive black holes (SMBH) of the participant galaxies. While this effect has been studied…

Astrophysics of Galaxies · Physics 2023-01-25 Robert W. Bickley , Sara L. Ellison , David R. Patton , Scott Wilkinson

Major mergers between galaxies are predicted to fuel their central supermassive black holes (SMBHs), particularly after coalescence. However, determining the prevalence of active galactic nuclei (AGNs) in mergers remains a challenge,…

Galaxy mergers are likely to play a role in triggering active galactic nuclei (AGN), but the conditions under which this process occurs are poorly understood. In Paper I, we constructed a sample of spatially offset X-ray AGN that represent…

Astrophysics of Galaxies · Physics 2017-04-12 R. Scott Barrows , Julia M. Comerford , Jenny E. Greene , David Pooley

We present a study of the incidence of active galactic nucleus (AGN) in a sample of major merging systems at 0.3<z<2.5. Galaxies in this merger sample have projected separations between 3 to 15 kpc and are selected from the CANDELS/3D-HST…

Interactions between galaxies are predicted to cause gas inflows that can potentially trigger nuclear activity. Since the inflowing material can obscure the central regions of interacting galaxies, a potential limitation of previous optical…

Astrophysics of Galaxies · Physics 2015-06-19 Shobita Satyapal , Sara L. Ellison , William McAlpine , Ryan C. Hickox , David R. Patton , J. Trevor Mendel

Galaxy mergers represent a fundamental physical process under hierarchical structure formation, but their role in triggering AGNs is still unclear. We aim to investigate the merger-AGN connection using state-of-the-art observations and…

Galaxy major mergers are a potential mechanism for triggering active galactic nuclei (AGN) activity, but their role remains debated, particularly beyond the local Universe. We aim to shed light on the merger-AGN connection at $z=0.5$-$2$,…

Astrophysics of Galaxies · Physics 2026-04-29 A. La Marca , B. Margalef-Bentabol , L. Wang , S. C. Trager , V. Rodriguez-Gomez , G. Martin

Aims. The fueling and feedback of Active Galactic Nuclei (AGNs) are important in understanding the co-evolution between black holes and host galaxies. Mergers are thought to have the capability to bring gas inwards and ignite nuclear…

Astrophysics of Galaxies · Physics 2020-05-27 F. Gao , L. Wang , W. J. Pearson , Y. A. Gordon , B. W. Holwerda , A. M. Hopkins , M. J. I. Brown , J. Bland-Hawthorn , M. S. Owers

We present the results of a new analysis of the X-ray selected Active Galactic Nuclei (AGN) population in the vicinity of 135 of the most massive galaxy clusters in the redshift range of 0.2 < z < 0.9 observed with Chandra. With a sample of…

Astrophysics of Galaxies · Physics 2015-06-22 S. Ehlert , S. W. Allen , W. N. Brandt , R. E. A. Canning , B. Luo , A. Mantz , R. G. Morris , A. von der Linden , Y. Q. Xue

It is not yet clear what triggers the activity of active galactic nuclei (AGNs), but galaxy merging has been suspected to be one of the main mechanisms fuelling the activity. Using deep optical images taken at various ground-based…

Astrophysics of Galaxies · Physics 2015-05-04 Jueun Hong , Myungshin Im , Minjin Kim , Luis C. Ho

There is an ongoing debate concerning the driver of nuclear activity in galaxies, with AGN either being triggered by major or minor galactic mergers or, alternatively, through secular processes like cooling gas accretion and/or formation of…

Cosmology and Nongalactic Astrophysics · Physics 2014-03-19 Marios Karouzos , Matt J. Jarvis , David Bonfield

Dual active galactic nuclei (AGNs) and offset AGNs are kpc-scale separation supermassive black holes pairs created during galaxy mergers, where both or one of the black holes are AGNs, respectively. These dual and offset AGNs are valuable…

Galaxy mergers are key events in galaxy evolution, often causing massive starbursts and fueling active galactic nuclei (AGN). In these highly dynamic systems, it is not yet precisely known how much starbursts and AGN respectively contribute…

While theory and simulations indicate that galaxy mergers play an important role in the cosmological evolution of accreting black holes and their host galaxies, samples of Active Galactic Nuclei (AGN) in galaxies at close separations are…

Despite the importance of Active Galactic Nuclei (AGN) in galaxy evolution, the mechanisms that fuel AGN activity remain poorly understood. Theoretical models suggest that major mergers of galaxies contribute strongly to AGN fuelling,…

Astrophysics of Galaxies · Physics 2023-09-12 C. Villforth

The role of galaxy mergers in fueling active galactic nuclei (AGN) is still debated, owing partly to selection effects inherent to studies of the merger/AGN connection. In particular, luminous AGN are often heavily obscured in late-stage…

Astrophysics of Galaxies · Physics 2018-07-23 Laura Blecha , Gregory F. Snyder , Shobita Satyapal , Sara L. Ellison

We quantify the presence of Active Galactic nuclei (AGN) in a mass-complete (M_* >5e10 M_sun) sample of 123 star-forming and quiescent galaxies at 1.5 < z < 2.5, using X-ray data from the 4 Ms Chandra Deep Field-South (CDF-S) survey.…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 Karen Pardos Olsen , Jesper Rasmussen , Sune Toft , Andrew W. Zirm

The question of whether galaxy mergers are linked to the triggering of active galactic nuclei (AGN) continues to be a topic of considerable debate. The issue can be broken down into two distinct questions: 1) Can galaxy mergers trigger AGN?…

The incidence and properties of Active Galactic Nuclei (AGN) in the field, groups, and clusters can provide new information about how these objects are triggered and fueled, similar to how these environments have been employed to study…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-20 Timothy J. Arnold , Paul Martini , John S. Mulchaey , Angela Berti , Tesla E. Jeltema
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