J/ApJ/667/131 Mass function of active black holes (Greene+, 2007)
The mass function of active black holes in the Local Universe.
Greene J.E., Ho L.C.
<Astrophys. J., 667, 131-148 (2007)>
=2007ApJ...667..131G 2007ApJ...667..131G
ADC_Keywords: Active gal. nuclei ; X-ray sources ; Redshifts
Keywords: galaxies: active - galaxies: nuclei - galaxies: Seyfert
Abstract:
We present the first measurement of the BH mass function for
broad-line active galaxies in the local universe. Using the ∼8500
broad-line active galaxies from SDSS-DR4, we construct a broad-line
luminosity function that agrees very well with the local soft X-ray
luminosity function. Using standard virial relations, we then convert
observed broad-line luminosities and widths into BH masses. A mass
function constructed in this way has the unique capability to probe
the mass region <106M☉ which, while insignificant in terms of
total BH mass density, nevertheless may place important constraints on
the mass distribution of seed BHs in the early universe.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 42 8497 The sample
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See also:
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS Name (JHHMMSS.ss+DDMMSS.s)
21- 26 F6.4 --- z Redshift (from SDSS)
28- 32 I5 km/s FWHMHa Hα FWHM
34- 38 F5.2 [10-7W] logLHa Hα luminosity
40- 42 F3.1 [solMass] logMBH Black hole mass (1)
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Note (1): MBH=(2.0+0.4-0.3)x106(LHa)0.55±0.02(FWHMHa)2.06±0.06
where LHa is in 1042erg/s and FWHMHa is in 103km/s
(Greene & Ho, 2005ApJ...630..122G 2005ApJ...630..122G)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Oct-2009