J/ApJ/670/92 New sample of low-mass black holes in AGN (Greene+, 2007)
A new sample of low-mass black holes in active galaxies.
Greene J.E., Ho L.C.
<Astrophys. J., 670, 92-104 (2007)>
=2007ApJ...670...92G 2007ApJ...670...92G
ADC_Keywords: Active gal. nuclei ; Spectroscopy ; Magnitudes ; X-ray sources ;
Radio sources
Keywords: galaxies: active - galaxies: nuclei - galaxies: Seyfert
Abstract:
We present an expanded sample of low-mass black holes (BHs) found in
galactic nuclei. Using standard virial mass techniques to estimate BH
masses, we select from the Fourth Data Release of the Sloan Digital
Sky Survey all broad-line active galaxies with masses <2x106M☉
BHs in this mass regime provide unique tests of the relationship
between BHs and galaxies, since their late-type galaxy hosts do not
necessarily contain classical bulges. Furthermore, they provide
observational analogs of primordial seed BHs and are expected, when
merging, to provide strong gravitational signals for future detectors
such as LISA. From our preliminary sample of 19, we have increased the
total sample by an order of magnitude to 174, as well as an additional
55 (less secure) candidates.
Description:
Our low-mass BHs are selected from the sample of broad-line AGNs with
z<0.352 described in detail by Greene & Ho (2007, Cat. J/ApJ/667/131).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 58 229 The SDSS Sample
table2.dat 103 229 Emission-line measurements
table3.dat 43 229 Luminosity and mass measurements
table4.dat 46 55 ROSAT detections
table5.dat 36 229 FIRST detections
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See also:
J/ApJ/667/131 : Mass function of active black holes (Greene+, 2007)
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- 3 I3 --- Seq Running identification number
5- 8 A4 --- --- [SDSS]
10- 28 A19 --- SDSS The SDSS identification (JHHMMSS.ss+DDMMSS.s)
30- 33 A4 --- Flag Object flag (1)
35- 40 F6.4 --- z Spectroscopic redshift from SDSS pipeline
42- 45 F4.1 mag gmag Petrosian g band magnitude
47 A1 --- n_gmag [*] if gmag is a model magnitude (2)
49- 52 F4.1 mag g-r Petrosian (g-r) color index
54- 58 F5.3 mag Ag Galactic extinction in the g band
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Note (1): Objects that are beneath our detection threshold are indicated
with c. Previous identifier, if relevant, is indicated.
Note (2): * = a questionable Petrosian magnitude (flagged as many_petro or
no_petro by the SDSS pipeline). The model magnitude provided instead.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running identification number
5- 9 F5.3 --- OII3727 ? [OII] (3727Å) emission line flux (1)
11 A1 --- l_FeII4570 Limit flag on FeII4570
12- 18 F7.4 --- FeII4570 FeII (4570Å) emission line flux (1)
20 A1 --- l_Hbn Limit flag on Hbn
21- 27 F7.3 --- Hbn Narrow Hβ component emission
line flux (1)
29 A1 --- l_Hbb Limit flag on Hbb
30- 36 F7.4 --- Hbb Broad Hβ component emission line flux (1)
38- 44 F7.3 10-20W/m2 OIII5007 The [OIII] (5007Å) emission line flux
46 A1 --- l_OI6300 Limit flag on OI-6300
47- 53 F7.4 --- OI6300 The [OI] (6300Å) emission line flux (1)
55- 60 F6.3 --- Han Narrow Hα component emission (1)
62- 67 F6.3 --- Hab Broad Hα component emission (1)
69 A1 --- l_NII6583 Limit flag on NII6583
70- 75 F6.3 --- NII6583 The [NII] (6583Å) emission line flux (1)
77 A1 --- l_SII6716 Limit flag on SII6716
78- 83 F6.3 --- SII6716 The [SII] (6716Å) emission line flux (1)
85 A1 --- l_SII6731 Limit flag on SII6731
86- 91 F6.3 --- SII6731 The [SII] (6731Å) emission line flux (1)
93- 96 I4 km/s W.Ha The Hα full width at half maximum (2)
98-103 F6.1 km/s W.OIII The [OIII] full width at half maximum (2)
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Note (1): Relative to that of [OIII](5007Å) and are observed values;
only a Galactic extinction correction has been applied.
Note (2): Corrected for instrumental resolution using the values measured
from arc spectra and tabulated by the SDSS.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running identification number
5- 10 F6.2 mag gMAGt Total g band absolute magnitude
12- 17 F6.2 mag gMAGa AGN g band absolute magnitude (1)
19- 24 F6.2 mag gMAGg ? Host galaxy g band absolute magnitude (2)
26- 30 F5.2 [10-7W] logLHa Log of AGN luminosity in broad Hα (3)
32- 34 F3.1 [solMass] logMBH Log of virial black hole mass estimate
36- 39 F4.1 [-] logLbol Bolometric to Eddington luminosities ratio
41- 43 F3.1 [solMass] logMMBHo ? Log of old black hole mass estimate (4)
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Note (1): Estimated from logLHa and a conversion from logLHa to gTMag
assuming fλ∝λ-1.566.
Note (2): Obtained by subtracting the AGN luminosity from the total
luminosity. Cases where the AGN accounts for the total galaxy
luminosity are blank.
Note (3): In units of erg/s.
Note (4): Previously reported in Greene & Ho (2007, Cat. J/ApJ/667/131).
There are no entries for the "c" sample (see Table 1).
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running identification number
5- 10 F6.4 ct/s CRate ROSAT count rate
12- 17 F6.4 ct/s e_CRate Uncertainty in CRate
19- 23 F5.2 [cm-2] logNH Log of Galactic hydrogen column density (1)
25- 30 F6.2 [mW/m2] logFX Log of 0.5-2keV band flux (2)
32- 35 F4.2 [mW/m2] e_logFX Uncertainty in logFX
37- 41 F5.2 [10-7W] logLX Log of 0.5-2keV luminosity in erg/s
43- 46 F4.2 [10-7W] e_logLX Uncertainty in logLX
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Note (1): Calculated following Dickey & Lockman (1990ARA&A..28..215D 1990ARA&A..28..215D).
Note (2): In ergs/s/cm2 and assuming a power-law spectrum with Γ=2
and logNH.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running identification number
5 A1 --- l_S1.5 Limit flag on S1.5
6- 10 F5.2 mJy S1.5 FIRST 20cm flux density
12- 15 F4.2 mJy e_S1.5 Uncertainty in S1.5 (1)
17 A1 --- l_logP1.5 Limit flag on P1.5
18- 23 F6.2 [W/Hz] logP1.5 Log of FIRST radio power at 1.5
25- 28 F4.2 [W/Hz] e_logP1.5 Uncertainty in logP1.5
30 A1 --- l_logR Limit flag on logR
31- 36 F6.3 [-] logR 6cm to 4400Å flux densities ratio (2)
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Note (1): Includes the 5% systematic uncertainty recommended by
White et al. (1997, Cat. VIII/59).
Note (2): Assuming a spectral index (fν∝ν-α)
αr=0.46 (radio; Ulvestad & Ho, 2001ApJ...558..561U 2001ApJ...558..561U) and
αo=0.44 (optical; Vanden Berk et al., 2001AJ....122..549V 2001AJ....122..549V),
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 27-Jan-2010