J/ApJ/585/647 Velocity dispersion in AGN (Boroson, 2003)
Does the narrow [O III] λ5007 line reflect the velocity dispersion
in active galactic nuclei?
Boroson T.A.
<Astrophys. J. 585, 647 (2003)>
=2003ApJ...585..647B 2003ApJ...585..647B
ADC_Keywords: QSOs ; Active gal. nuclei ; Redshifts ; Radio lines ;
Velocity dispersion
Keywords: black hole physics - galaxies: active - galaxies: bulges -
galaxies: nuclei - quasars: emission lines
Abstract:
It has been proposed that the width of the narrow [O III] λ5007
emission line can be used as a surrogate for the stellar velocity
dispersion in active galaxies. This proposition is tested using the
Sloan Digital Sky Survey (SDSS) Early Data Release (EDR) spectra of
107 low-redshift radio-quiet QSOs and Seyfert 1 galaxies by
investigating the correlation between black hole mass, as determined
from Hβ FWHM and optical luminosity, and [O III] FWHM. The
correlation is real, but the scatter is large. Without additional
information or selection criteria, the [O III] width can predict the
black hole mass to a factor of 5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 62 115 Line widths and black hole masses of SDSS sample
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See also:
J/AJ/123/567 : SDSS quasar catalog. EDR. (Schneider+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 24 A19 --- SDSS SDSS name (based oin J2000 position)
26- 31 F6.4 --- z Redshift
33- 37 I5 km/s FWHM The Full-Width at Half-Maximum of Hβ
39- 41 I3 km/s sigma The [O III] velocity dispersion
43- 46 F4.2 [solMass] logM Log of the black hole mass (1)
48- 52 F5.2 [---] logR ? Log of the ratio of flux density at 5GHz
to flux density at 2500 Angstrom
54- 55 A2 --- f_logR Flag on logR (2)
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Note (1): Derived using the formula M=v2*RBLR/G, where
v=30.5/2*FWHM, and RBLR=32.9(λ*L5100/1044ergs/s)0.7
light days (Kaspi et al., 2000ApJ...533..631K 2000ApJ...533..631K). The values of L5100
were derived from the r* photometry in the SDSS database. Fluxes
were converted to luminosities using the Schlegel et al.
(1998ApJ...500..525S 1998ApJ...500..525S) maps for correcting for galactic absorption,
H0=75km/s/Mpc, and q0=0.5.
Note (2): Flags:
: = indicates a differences between the radio and optical centroid of
more than 2 arcseconds
nd = Not detected
no = Not observed
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History:
From electronic version of the journal
References:
Stoughton et al., 2002AJ....123..485S 2002AJ....123..485S, SDSS: early data release.
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 29-Apr-2003