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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
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:
FileName Lrecl Records Explanations
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
See also: J/ApJ/667/131 : Mass function of active black holes (Greene+, 2007) : SDSS Home Page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Running identification number 5- 8 A4 --- --- [SDSS] 10- 28 A19 --- SDSS The SDSS identification ( 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
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.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Running identification number 5- 9 F5.3 --- OII3727 ? [OII] (3727AA) emission line flux (1) 11 A1 --- l_FeII4570 Limit flag on FeII4570 12- 18 F7.4 --- FeII4570 FeII (4570AA) emission line flux (1) 20 A1 --- l_Hbn Limit flag on Hbn 21- 27 F7.3 --- Hbn Narrow Hbeta component emission line flux (1) 29 A1 --- l_Hbb Limit flag on Hbb 30- 36 F7.4 --- Hbb Broad Hbeta 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] (6300AA) emission line flux (1) 55- 60 F6.3 --- Han Narrow Halpha component emission (1) 62- 67 F6.3 --- Hab Broad Halpha component emission (1) 69 A1 --- l_NII6583 Limit flag on NII6583 70- 75 F6.3 --- NII6583 The [NII] (6583AA) emission line flux (1) 77 A1 --- l_SII6716 Limit flag on SII6716 78- 83 F6.3 --- SII6716 The [SII] (6716AA) emission line flux (1) 85 A1 --- l_SII6731 Limit flag on SII6731 86- 91 F6.3 --- SII6731 The [SII] (6731AA) emission line flux (1) 93- 96 I4 km/s W.Ha The Halpha full width at half maximum (2) 98-103 F6.1 km/s W.OIII The [OIII] full width at half maximum (2)
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.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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 Halpha (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)
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).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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
Note (1): Calculated following Dickey & Lockman (1990ARA&A..28..215D). Note (2): In ergs/s/cm2 and assuming a power-law spectrum with Γ=2 and logNH.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
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 4400AA flux densities ratio (2)
Note (1): Includes the 5% systematic uncertainty recommended by White et al. (1997, Cat. VIII/59). Note (2): Assuming a spectral index (fν∝ν) αr=0.46 (radio; Ulvestad & Ho, 2001ApJ...558..561U) and αo=0.44 (optical; Vanden Berk et al., 2001AJ....122..549V),
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 27-Jan-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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