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Investigating the Effect of Galaxy Interactions on AGN Enhancement at $0.5<z<3.0$

Shah, EA, Kartaltepe, JS, Magagnoli, CT, Cox, IG, Wetherell, CT, Vanderhoof, BN, Calabro, A, Chartab, N, Conselice, CJ, Croton, DJ, Donley, J, Groot, LD, Vega, ADL, Hathi, NP, Ilbert, O, Inami, H, Kocevski, DD, Koekemoer, AM, Lemaux, BC, Mantha, KB , Marchesi, S, Martig, M, Masters, DC, McGrath, EJ, McIntosh, DH, Moreno, J, Nayyeri, H, Pampliega, BA, Salvato, M, Snyder, GF, Straughn, AN, Treister, E and Weston, ME Investigating the Effect of Galaxy Interactions on AGN Enhancement at $0.5<z<3.0$. The Astrophysical Journal. ISSN 1538-4357 (Accepted)

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Galaxy interactions and mergers are thought to play an important role in the evolution of galaxies. Studies in the nearby universe show a higher AGN fraction in interacting and merging galaxies than their isolated counterparts, indicating that such interactions are important contributors to black hole growth. To investigate the evolution of this role at higher redshifts, we have compiled the largest known sample of major spectroscopic galaxy pairs (2381 with $\Delta V <5000$ km s$^{-1}$) at $0.5<z<3.0$ from observations in the COSMOS and CANDELS surveys. We identify X-ray and IR AGN among this kinematic pair sample, a visually identified sample of mergers and interactions, and a mass-, redshift-, and environment-matched control sample for each in order to calculate AGN fractions and the level of AGN enhancement as a function of relative velocity, redshift, and X-ray luminosity. While we see a slight increase in AGN fraction with decreasing projected separation, overall, we find no significant enhancement relative to the control sample at any separation. In the closest projected separation bin ($<25$ kpc, $\Delta V <1000$ km s$^{-1}$), we find enhancements of a factor of 0.94$^{+0.21}_{-0.16}$ and 1.00$^{+0.58}_{-0.31}$ for X-ray and IR-selected AGN, respectively. While we conclude that galaxy interactions do not significantly enhance AGN activity on average over $0.5<z<3.0$ at these separations, given the errors and the small sample size at the closest projected separations, our results would be consistent with the presence of low-level AGN enhancement.

Item Type: Article
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
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Date Deposited: 01 Dec 2020 10:41
Last Modified: 01 Dec 2020 10:41
URI: https://researchonline.ljmu.ac.uk/id/eprint/14102

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