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Article overview
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Misclassified type 1 AGNs in the local universe | | Jong-Hak Woo
; Ji-Gang Kim
; Daeseong Park
; Hyun-Jin Bae
; Jae-Hyuk Kim
; Seung-Eun Lee
; Sang Chul Kim
; Hong-Jin Kwon
; | | Date: |
10 Nov 2014 | | Abstract: | We search for misclassified type 1 AGNs among type 2 AGNs identified with
emission line flux ratios, and investigate the properties of the sample. Using
4,113 local type 2 AGNs at $0.02<z<0.05$ selected from Sloan Digital Sky
Survey Data Release 7, we detected a broad component of the Ha line with a
Full-Width at Half-Maximum (FWHM) ranging from 1,700 to 19,090 kms for 142
objects, based on the spectral decomposition and visual inspection. The
fraction of the misclassified type 1 AGNs among type 2 AGN sample is
$sim$3.5%, implying that a large number of missing type 1 AGN population may
exist. The misclassified type 1 AGNs have relatively low luminosity with a mean
broad Ha luminosity, log L$_{Halpha} = 40.50pm0.35$ ergs, while black hole
mass of the sample is comparable to that of the local black hole population,
with a mean black hole mass, log M$_{
m BH} = 6.94pm0.51$ M$_{odot}$. The
mean Eddington ratio of the sample is log L$_{
m bol}$/L$_{
m Edd}$ =
$-2.00pm0.40$, indicating that black hole activity is relatively weak, hence,
AGN continuum is too weak to change the host galaxy color. We find that the
OIII lines show significant velocity offsets, presumably due to outflows in
the narrow-line region, while the velocity offset of the narrow component of
the Ha line is not prominent, consistent with the ionized gas kinematics of
general type 1 AGN population. | | Source: | arXiv, 1411.2327 | | Services: | Forum | Review | PDF | Favorites | |
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