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Mousumi Das, Khatun Rubinur, Preeti Kharb, Ashlin Varghese, Navyasree Kovakkuni & Atul James

Dual Active Galactic Nuclei in Nearby Galaxies

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Mots-clés : AGN, astronomie, astrophysique, extragalactique, galaxies, radio

Abstract

Galaxy mergers play a crucial role in the formation of massive galaxies and the buildup of their bulges. An important aspect of the merging process is the in-spiral of the supermassive black-holes (SMBHs) to the centre of the merger remnant and the eventual formation of a SMBH binary. If both the SMBHs are accreting they will form a dual or binary active galactic nucleus (DAGN). The final merger remnant is usually very bright and shows enhanced star formation. In this paper we summarise the current sample of DAGN from previous studies and describe methods that can be used to identify strong DAGN candidates from optical and spectroscopic surveys. These methods depend on the Doppler separation of the double peaked AGN emission lines, the nuclear velocity dispersion of the galaxies and their optical/UV colours. We describe two high resolution, radio observations of DAGN candidates that have been selected based on their double peaked optical emission lines (DPAGN). We also examine whether DAGN host galaxies have higher star formation rates (SFRs) compared to merging galaxies that do not appear to have DAGN. We find that the SFR is not higher for DAGN host galaxies. This suggests that the SFRs in DAGN host galaxies is due to the merging process itself and not related to the presence of two AGN in the system.

Keywords : AGN, astronomy, astrophysics, extragalactic, galaxies, radio

To cite this article

Mousumi Das, Khatun Rubinur, Preeti Kharb, Ashlin Varghese, Navyasree Kovakkuni & Atul James, «Dual Active Galactic Nuclei in Nearby Galaxies», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 87 - Année 2018, Actes de colloques, First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - November 2016 - Nainital, India, 209 - 306 URL : https://popups.uliege.be/0037-9565/index.php?id=7738.

About: Mousumi Das

Indian Institute of Astrophysics, Bangalore 560034, India, mousumi@iiap.res.in

About: Khatun Rubinur

Indian Institute of Astrophysics, Bangalore 560034, India and Pondicherry University, 605014 Pondicherry, India

About: Preeti Kharb

National Center for Radio Astrophysics-Tata Institute of Fundamental Research, Pune 411007, India

About: Ashlin Varghese

Christ University, Hosur Road, Bengaluru 560029, India

About: Navyasree Kovakkuni

Christ University, Hosur Road, Bengaluru 560029, India

About: Atul James

Christ University, Hosur Road, Bengaluru 560029, India