J/MNRAS/454/3864 Orientation & QSO black hole mass estimation (Brotherton+ 2015)
Orientation and quasar black hole mass estimation.
Brotherton M.S., Singh V., Runnoe J.
<Mon. Not. R. Astron. Soc., 454, 3864-3871 (2015)>
=2015MNRAS.454.3864B 2015MNRAS.454.3864B (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; QSOs ; Velocity dispersion
Keywords: galaxies: active - quasars: general
Abstract:
We have constructed a sample of 386 radio-loud quasars with z<0.75
from the Sloan Digital Sky Survey in order to investigate orientation
effects on black hole mass estimates. Orientation is estimated using
radio core dominance measurements based on FIRST survey maps. Black
hole masses are estimated from virial-based scaling relationships
using Hβ, and compared to the stellar velocity dispersion
(σ*), predicted using the full width at half maximum (FWHM) of
[OIII] λ5007, which tracks mass via the M-σ* relation. We
find that the FWHM of Hβ correlates significantly with radio core
dominance and biases black hole mass determinations that use it, but
that this is not the case for σ* based on [OIII] λ5007.
The ratio of black hole masses predicted using orientation-biased and
unbiased estimates, which can be determined for radio-quiet as well as
radio-loud quasars, is significantly correlated with radio core
dominance. Although there is significant scatter, this mass ratio
calculated in this way may in fact serve as an orientation estimator.
We additionally note the existence of a small population of radio
core-dominated quasars with extremely broad Hβ emission lines
that we hypothesize may represent recent black hole mergers.
Description:
We recalibrated FWHM [OIII] as a proxy for σ* using the sample and
measurements of Shen et al. (2008, Cat. J/AJ/135/928). We then
constructed a sample of radio-loud quasars based on a combination of
SDSS, NVSS, and FIRST catalogues and measured FWHM [OIII] in order
to predict σ*.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 773 Measurements for the revised Shen et al.
(2008, Cat. J/AJ/135/928) sample
table2.dat 99 386 Optical measurements for the radio-loud sample
table3.dat 45 386 FIRST 1.4 GHz measurements for the radio-loud
sample and core dominance
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See also:
VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)
J/AJ/135/928 : The black hole-bulge relationship (Shen+, 2008)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- SDSS SDSS name (HHMMSS.ss+DDMMSS.s)
20- 25 F6.4 --- z Redshift
27- 31 F5.1 km/s sigma velocity dispersion (1)
33- 36 F4.1 km/s e_sigma rms uncertainty on sigma (1)
38- 40 I3 km/s Csigma Corrected velocity dispersion
42- 47 F6.1 km/s FWHM FWHM of [OIII] λ5007Å line
49- 53 F5.1 km/s InstR FWHM of the instrumental resolution
55- 60 F6.1 km/s FWHMI Intrincsic FWHM of [OIII] λ5007Å
line (2)
62- 64 I3 km/s e_FWHMI rms uncertainty on FWHMI
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Note (1): The sigma and e_sigma columns are taken from Shen et al.
(2008, Cat. J/AJ/135/928), along with an-aperture corrected sigma (Csigma)
rounded to the nearest whole number. Please refer to section 2 of the paper
for final sample selection criteria.
Note (2): The final or intrinsic value (FWHMI) is obtained by subtracting InstR
from the calculated value in quadrature.
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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- 18 A18 --- SDSS SDSS name (HHMMSS.ss+DDMMSS.s)
20- 25 F6.4 --- z Redshift (1)
27- 32 F6.2 mag IMAG Absolute I magnitude (1)
34- 39 F6.3 [10-7W] logL5100 Continuum luminosity at 5100Å (1)
41- 45 F5.3 [10-7W] e_logL5100 rms uncertainty on logL5100 (1)
47- 53 F7.1 km/s FWHMHb FWHM of Hβ line (1)
55- 61 F7.1 km/s e_FWHMHb rms uncertainty on FWMHHb (1)
63- 67 F5.2 [Msun] logMHb Black hole mass derived from FWHMHb (1)
69- 72 F4.2 [Msun] e_logMHb rms uncertainty on logMHb (1)
74- 78 F5.2 [-] logL/LEdd Bolometric to Eddington luminosity
ratio (1)
80- 85 F6.1 km/s FWHM[OIII] FWHM of [OIII] λ5007Å line
87- 89 I3 km/s e_FWHM[OIII] rms uncertainty on FWHM[OIII]
91- 94 F4.2 [km/s] logsigma*[OIII] Velocity dispersion of [OIII] (2)
96- 99 F4.2 [km/s] e_logsigma*[OIII] rms uncertainty on logsigma
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Note (1): taken from the Shen et al. (2011, Cat. J/ApJS/194/45) DR7 catalog.
Note (2): predicted using the formula obtained in Section 2.1.
logsigma*[OIII]=1.0366(±0.0712)+0.4701(±0.0284)logFWHM[OIII].
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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- 18 A18 --- SDSS SDSS name (HHMMSS.ss+DDMMSS.s)
20- 25 F6.4 --- z Redshift
27- 32 F6.1 mJy FCore FIRST 1.4GHz core flux density
34- 39 F6.1 mJy FExt FIRST 1.4GHz extended flux density
41- 45 F5.2 --- kcor Adopted radio core dominance parameter
k-corrected to 5GHz rest frame
(k-corrected log R)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Jul-2016