Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 465, Issue 1, Pages 997-1007Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw2705
Keywords
galaxies: active; galaxies: general; galaxies: nuclei; infrared: galaxies; radio continuum: galaxies; radio lines: galaxies.
Categories
Funding
- Chinese Academy of Sciences Visiting Fellowship for Researchers from Developing Countries [2013FFJB0009]
- National Natural Science Foundation of China (NSFC) [11550110181]
- China Ministry of Science and Technology under State Key Development Program for Basic Research (973 program) [2012CB821802]
- National Aeronautics and Space Administration
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy Office of Science
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- Carnegie Mellon University
- University of Florida
- French Participation Group
- German Participation Group
- Harvard University
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- Max Planck Institute for Extraterrestrial Physics
- New Mexico State University
- New York University
- Ohio State University
- Pennsylvania State University
- University of Portsmouth
- Princeton University
- Spanish Participation Group
- University of Tokyo
- University of Utah
- Vanderbilt University
- University of Virginia
- University of Washington
- Yale University
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HI absorption studies of active galaxies enable us to probe their circumnuclear regions and the general interstellar medium and study the supply of gas that may trigger nuclear activity. In this article, we investigate the dependence of the detection rate of HI absorption on the nature of radio galaxies based on their emission-line spectra and on the nature of host galaxies based on WISE colours and their radio structure, which may help us understand the different accretion modes. We find significant differences in the distributions of W2-W3 colour for sources with HI absorption detections and non-detections. We report a high detection rate of HI absorption in those galaxies with WISE infrared colours W2-W3 > 2, typical of gasrich systems, along with a compact radio structure. The HI detection rate for low-excitation radio galaxies ( LERGs) with W2-W3 > 2 and compact radio structure is high ( 70.6 +/- 20.4 per cent). In high-excitation radio galaxies ( HERGs), compact radio structure in the nuclear or circumnuclear region could give rise to absorption by gas in the dusty torus, in addition to gas in the interstellar medium. However, the higher specific star-formation rate ( sSFR) for LERGs with W2-W3 > 2 suggests that HI absorption may be largely due to star-forming gas in their hosts. LERGs with extended radio structure tend to have significantly lower values of W2-W3 compared with those with compact structure. Extended radio sources and those with W2-W3 < 2 have low H-I detection rates.
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