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Aims. With the aim of performing a suitable comparison of the internal process of galactic bars with respect to the external effect of interactions on driving gas toward the inner most region of the galaxies, we explored the efficiency of…

Astrophysics of Galaxies · Physics 2018-10-31 Sol Alonso , Georgina Coldwell , Fernanda Duplancic , Valeria Mesa , Diego G. Lambas

Bars are considered an efficient mechanism for transporting gas toward the central regions of galaxies, potentially enhancing nuclear activity. However, the extent to which bars influence active galactic nuclei (AGNs), and whether their…

Astrophysics of Galaxies · Physics 2025-06-02 V. Marels , V. Mesa , M. Jaque Arancibia , S. Alonso , G. Coldwell , G. Damke , V. Contreras Rojas

With the aim of assessing the effects of bars on active galactic nuclei (AGN), we present an analysis of host characteristics and nuclear activity of AGN galaxies with and without bars selected from the Sloan Digital Sky Survey Data Release…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 Sol Alonso , Georgina Coldwell , Diego Garcia Lambas

We present a statistical analysis of the connections between galactic bars, star formation, and active galactic nucleus (AGN) activity using 33,201 disk galaxies (0.01 < z < 0.05) from DESI DR1 cross-matched with Galaxy Zoo DESI. Based on…

Astrophysics of Galaxies · Physics 2026-05-07 Jianfei Liu , Zhimin Zhou

Close encounters between galaxies are expected to be a viable mechanism, as predicted by numerical simulations, by which accretion onto supermassive black holes can be initiated. To test this scenario, we construct a sample of 562 galaxies…

The high luminosity displayed by an active galactic nucleus (AGN) requires that gas be transported to the centre of the galaxy by some mechanism. Bar-driven processes are often pointed out in this context and a number of studies have…

Astrophysics of Galaxies · Physics 2022-05-11 Luiz A. Silva-Lima , Lucimara P. Martins , Paula R. T. Coelho , Dimitri A. Gadotti

We explore properties of barred active spiral galaxies in groups selected from the SDSS-DR7, with the aim of assessing the effects of bars on AGN and the role of the high density environment. We identified barred active galaxies that reside…

Astrophysics of Galaxies · Physics 2015-06-23 Sol Alonso , Georgina Coldwell , Diego García Lambas

We investigate the connection between the presence of bars and AGN activity, using a volume-limited sample of $\sim$9,000 late-type galaxies with axis ratio $b/a>0.6$ and $M_{r} < -19.5+5{\rm log}h$ at low redshift ($0.02\le z\lesssim…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-04 Gwang-Ho Lee , Jong-Hak Woo , Myung Gyoon Lee , Ho Seong Hwang , Jong Chul Lee , Jubee Sohn , Jong Hwan Lee

Galaxy-galaxy interactions are predicted to cause gas inflows leading to enhanced nuclear star formation. In this paper we test the further prediction that the gas inflows lead to enhanced accretion onto the central supermassive black hole,…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 Sara L. Ellison , David R. Patton , J. Trevor Mendel , Jillian M. Scudder

We aim to unravel the interplay between bars, star formation (SF), and active galactic nuclei (AGNs) in barred galaxies. To this end, we utilize the SDSS DR12 to select a sample of nearby (0.02 < z < 0.06) disk galaxies that are suitable…

Astrophysics of Galaxies · Physics 2023-06-07 Woong-Bae G. Zee , Sanjaya Paudel , Jun-Sung Moon , Suk-Jin Yoon

Galactic bars are often suspected to be a channel of gas inflow to the galactic center and trigger central star formation and active galactic nuclei (AGN) activity. However, the current status on this issue based on empirical studies is…

Astrophysics of Galaxies · Physics 2015-06-03 Seulhee Oh , Kyuseok Oh , Sukyoung K. Yi

We perform a statistical analysis of AGN host characteristics and nuclear activity for AGNs in pairs and without companions. Our study concerns a sample of AGNs derived from the SDSS-DR4 data by Kauffmann et al (2003) and pair galaxies…

Astrophysics · Physics 2008-11-26 M. Sol Alonso , Diego G. Lambas , Patricia Tissera , Georgina Coldwell

We investigate the role of galactic bars in fuelling and triggering Active Galactic Nucleus (AGN) in disc galaxies up to $z\sim 0.8$. We utilise a Deep Learning model, fine-tuned on Galaxy Zoo volunteer classifications, to identify…

Astrophysics of Galaxies · Physics 2026-03-04 A. La Marca , M. T. Nardone , L. Wang , B. Margalef-Bentabol , S. Kruk , S. C. Trager

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-galaxy mergers and close interactions have long been regarded as a viable mechanism for channeling gas toward the central supermassive black holes (SMBHs) of galaxies which are triggered as active galactic nuclei (AGNs). AGN pairs,…

Cosmology and Nongalactic Astrophysics · Physics 2011-08-11 Xin Liu , Yue Shen , Michael A. Strauss , Lei Hao

We study the influence of the presence of a strong bar in disc galaxies which host an active galactic nucleus (AGN). Using data from the Sloan Digital Sky Survey and morphological classifications from the Galaxy Zoo 2 project, we create a…

Observations of the nearby universe reveal an increasing fraction of active galactic nuclei (AGN) with decreasing projected separation for close galaxy pairs, relative to control galaxies. This implies galaxy interactions play a role in…

Astrophysics of Galaxies · Physics 2023-05-17 Sean L. Dougherty , C. M. Harrison , Dale D. Kocevski , D. J. Rosario

It has long been known that galaxy interactions are associated with enhanced star formation. In a companion paper, we explored this connection by applying a variety of statistics to SDSS data. In particular, we showed that specific star…

Astrophysics · Physics 2009-11-13 Cheng Li , Guinevere Kauffmann , Timothy M. Heckman , Simon D. M. White , Y. P. Jing

Active galactic nuclei (AGNs) are occasionally seen in pairs, suggesting that tidal encounters are responsible for the accretion of material by both central supermassive black holes (BHs). In Paper I of this series, we selected a sample of…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Xin Liu , Yue Shen , Michael A. Strauss
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