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Article
Galaxy and Mass Assembly (GAMA) : active galactic nuclei in pairs of galaxies.
Faculty Scholarship
  • Yjan A. Gordon, University of Hull
  • Matt S. Owers, Macquarie University
  • Kevin A. Pimbblet, University of Hull
  • Scott M. Croom, University of Sydney
  • Mehmet Alpaslan, NASA Ames Research Center
  • Ivan K. Baldry, Liverpool John Moores University
  • Sarah Brough, Australian Astronomical Observatory
  • Michael J. I. Brown, Monash University
  • Michelle E. Cluver, University of Western Cape
  • Christopher J. Conselice, University of Nottingham
  • Luke J. M. Davies, University of Western Australia
  • Benne W. Holwerda, University of Louisville
  • Andrew M. Hopkins, Australian Astronomical Observatory
  • Madusha L. P. Gunawardhana, Ponticia Universidad Catolica de Chile
  • Jonathan Loveday, University of Sussex
  • Edward N. Taylor, Swinburne University of Technology
  • Lingyu Wang, University of Groningen
Document Type
Article
Publication Date
3-1-2017
Department
Physics and Astronomy
Abstract

There exist conflicting observations on whether or not the environment of broad- and narrow-line active galatic nuclei (AGN) differ and this consequently questions the validity of the AGN unification model. The high spectroscopic completeness of the Galaxy and Mass Assembly (GAMA) survey makes it ideal for a comprehensive analysis of the close environment of galaxies. To exploit this, and conduct a comparative analysis of the environment of broad- and narrow-line AGN within GAMA, we use a double-Gaussian emission line fitting method to model the more complex line profiles associated with broad-line AGN. We select 209 type 1 (i.e. unobscured), 464 type 1.5–1.9 (partially obscured), and 281 type 2 (obscured) AGN within the GAMA II data base. Comparing the fractions of these with neighbouring galaxies out to a pair separation of 350 kpc h−1 and Δz < 0.012 shows no difference between AGN of different type, except at separations less than 20 kpc h−1 where our observations suggest an excess of type 2 AGN in close pairs. We analyse the properties of the galaxies neighbouring our AGN and find no significant differences in colour or the star formation activity of these galaxies. Further to this, we find that Σ5 is also consistent between broad- and narrow-line AGN. We conclude that the observations presented here are consistent with AGN unification.

Comments

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Copyright: 2017. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

https://doi.org/10.1093/mnras/stw2925

DOI
10.1093/mnras/stw2925
Citation Information

Gordon, Yjan A., et al. "Galaxy and Mass Assembly (GAMA): Active Galactic Nuclei in Pairs of Galaxies." 2017. Monthly Notices of the Royal Astronomical Society 465(3): 2671-2686.