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The Prevalence of Gas Outflows in Type 2 AGNs | Jong-Hak Woo
; Hyun-Jin Bae
; Donghoon Son
; Marios Karouzos
; | Date: |
16 Nov 2015 | Abstract: | To 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 | Services: | Forum | Review | PDF | Favorites |
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