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Searching for dual AGN in galaxies with double-peaked emission line spectra using radio observations

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dc.contributor.author Rubinur, K
dc.contributor.author Mousumi Das
dc.contributor.author Kharb, P
dc.date.accessioned 2020-11-20T13:28:16Z
dc.date.available 2020-11-20T13:28:16Z
dc.date.issued 2019-04
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 484, No. 4, pp. 4933-4950 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7331
dc.description Restricted Access © Royal Astronomical Society https://doi.org/10.1093/mnras/stz334 en_US
dc.description.abstract Supermassive black hole (SMBH) binaries form due to galaxy mergers and minor accretion events. When the SMBHs are accreting, they form dual or binary AGN and can give rise to double-peaked emission lines in the optical spectra of the merger remnant. The double-peaked emission lines could also be due to jet-ISM interaction or rotating discs. One of the best ways to confirm dual/binary AGN in double-peaked AGN (DPAGN) is using high-resolution radio observations. We have observed a sample of 20 DPAGN at two or more frequencies using the Karl G. Jansky Very Large Array (VLA), of which one source is already published and the remaining 19 are presented in this paper. We have detected dual radio structures at separation of ≲10 kpc in three of our sample galaxies. Using the spectral index maps and optical spectra of the sources, we have confirmed that one of them is a dual AGN (DAGN), while the other two can be dual AGN or AGN + star-forming nuclei pairs. Of the remaining sources, one has a clear core-jet structure and another source could be a core-jet structure or a DAGN. The remaining 13 sources are single cores while one source is not detected at any frequency. We find that for our dual AGN detection, the DPAGN emission lines do not originate from the dual/binary AGN. Instead, they could be due to outflows or jets. Hence, we conclude that DPAGN identified in low-resolution SDSS spectra are not good indicators of dual/binary AGN. On the other hand, closely interacting galaxies or merger remnants are good candidates for detecting dual/binary AGN. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject Galaxies: active en_US
dc.subject Galaxies: formation en_US
dc.subject Galaxies: nuclei en_US
dc.subject Radio continuum: galaxies en_US
dc.title Searching for dual AGN in galaxies with double-peaked emission line spectra using radio observations en_US
dc.type Article en_US

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