Journal
ASTROPHYSICAL JOURNAL
Volume 795, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/795/1/30
Keywords
galaxies: active; galaxies: kinematics and dynamics; galaxies: nuclei
Categories
Funding
- NRF (National Research Foundation of Korea) - Korean Government
- National Research Foundation of Korea (NRF) - Korea government [2012-006087]
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- National Research Foundation of Korea [2011-0002355] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We perform a census of ionized gas outflows using a sample of similar to 23,000 type 2 active galactic nuclei (AGNs) out to z similar to 0.1. By measuring the velocity offset of narrow emission lines, i.e., [O III] lambda 5007 and H alpha, with respect to the systemic velocity measured from the stellar absorption lines, we find that 47% of AGNs display an [O III] line-of-sight velocity offset >= 20 km s(-1). The fraction of the [O III] velocity offset in type 2 AGNs is comparable to that in type 1 AGNs after considering the projection effect. AGNs with a large [O III] velocity offset preferentially have a high Eddington ratio, implying that the detected velocity offsets are related to black hole activity. The distribution of the host galaxy inclination is clearly different between the AGNs with blueshifted [O III] and the AGNs with redshifted [O III], supporting the combined model of the biconical outflow and dust obscuration. In addition, for similar to 3% of AGNs, [O III] and H alpha show comparable large velocity offsets, indicating a more complex gas kinematics than decelerating outflows in a stratified narrow-line region.
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