Searching for Dual Active Galactic Nuclei

Abstract

Binary or dual active galactic nuclei (DAGN) are expected from galaxy formation theories. However, confirmed DAGN are rare and finding these systems has proved to be challenging. Recent systematic searches for DAGN using double-peaked emission lines have yielded several new detections. As have the studies of samples of merging galaxies. In this paper, we present an updated list of DAGN compiled from published data. We also present preliminary results from our ongoing Expanded Very Large Array (EVLA) radio study of eight double- peaked emission-line AGN (DPAGN). One of the sample galaxy shows an S-shaped radio jet. Using new and archival data, we have successfully fitted a precessing jet model to this radio source. We find that the jet precession could be due to a binary AGN with a super-massive black-hole (SMBH) separation of 0.02 pc or a single AGN with a tilted accretion disk. We have found that another sample galaxy, which is undergoing a merger, has two radio cores with a projected separation of 5.6 kpc. We discuss the preliminary results from our radio study.

8 pages, 1 Figure, Accepted in Journal of Astrophysics and Astronomy; Special issue on the proceedings of "Recent trends in the study of compact objects-III"

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Cited by in corpus (11)

• The Astrophysics of Nanohertz Gravitational Waves
• The deepest $Chandra$ view of RBS 797: evidence for two pairs of equidistant X-ray cavities
• VLBI studies of DAGN and SMBHB hosting galaxies
• Double-peaked Lines, Dual VLBI Components, and Precessing Jets in J1328+2751
• A possible sub-kiloparsec dual AGN buried behind the galaxy curtain
• Intrinsic and observed dual AGN fractions from major mergers
• Automated Detection of Double Nuclei Galaxies using GOTHIC and the Discovery of a Large Sample of Dual AGN
• Deep VLBI Observations Challenge Previous Evidence of a Binary Supermassive Black Hole Residing in the Seyfert Galaxy NGC 7674
• Unravelling the nature of the dual AGN in the galaxy pair system IRAS 05589+2828 and 2MASX J06021107+2828382
• Prospects for observing supermassive black hole binaries with the space-ground interferometer
• Investigating the Bulge Morphology of Dual AGN Host Galaxies from the GOTHIC survey