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29 March 2024
 
  » arxiv » 1511.5142

 Article overview


The Prevalence of Gas Outflows in Type 2 AGNs
Jong-Hak Woo ; Hyun-Jin Bae ; Donghoon Son ; Marios Karouzos ;
Date 16 Nov 2015
AbstractTo constrain the nature and fraction of the ionized gas outflows in AGNs, we perform a detailed analysis on gas kinematics as manifested by the velocity dispersion and shift of the OIII {lambda}5007 emission line, using a large sample of ~39,000 type 2 AGNs at z<0.3. First, we confirm a broad correlation between OIII and stellar velocity dispersions, indicating that the bulge gravitational potential plays a main role in determining the OIII kinematics. However, OIII velocity dispersion is on average larger than stellar velocity dispersion by a factor of 1.3-1.4, suggesting that the non-gravitational component, i.e., outflows, is almost comparable to the gravitational component. Second, the increase of the OIII velocity dispersion (after normalized by stellar velocity dispersion) with both AGN luminosity and Eddington ratio suggests that non-gravitational kinematics are clearly linked to AGN accretion. The distribution in the OIII velocity - velocity dispersion diagram dramatically expands toward large values with increasing AGN luminosity, implying that the launching velocity of gas outflows increases with AGN luminosity. Third, the majority of luminous AGNs presents the non-gravitational kinematics in the OIII profile. These results suggest that ionized gas outflows are prevalent among type 2 AGNs. On the other hand, we find no strong trend of the OIII kinematics with radio luminosity, once we remove the effect of the bulge gravitational potential, indicating that ionized gas outflows are not directly related to radio activity for the majority of type 2 AGNs.
Source arXiv, 1511.5142
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