J/A+A/560/A104 UV variability of quasars (Meusinger+, 2013)
Ultraviolet variability of quasars: dependence on the accretion rate.
Meusinger H., Weiss, V.
<Astron. Astrophys. 560, A104 (2013)>
=2013A&A...560A.104M 2013A&A...560A.104M
ADC_Keywords: Active gal. nuclei ; QSOs
Keywords: quasars: general - quasars: supermassive black holes
Abstract:
Although the variability in the ultraviolet and optical domain is one
of the major characteristics of quasars, the dominant underlying
mechanisms are still poorly understood. There is a broad consensus on
the relationship between the strength of the variability and such
quantities as time-lag, wavelength, luminosity, and redshift. However,
evidence on a dependence on the fundamental parameters of the
accretion process is still inconclusive. This paper is focused on the
correlation between the ultraviolet quasar long-term variability and
the accretion rate.
Description:
We present a catalogue of 3916 quasars with redshifts between 0.7 and
1.7 from the Sloan Digital Sky Survey Stripe 82. The catalogue
combines individual estimators for the variability strength from
Meusinger et al. (2011, Cat. J/A+A/525/37), luminosities and virial
black hole masses from Shen et al. (2011ApJS..194...45S 2011ApJS..194...45S), and mass
accretions rates computed from the scaling relation derived by Davis &
Laor (2011ApJ...728...98D 2011ApJ...728...98D).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 212 3916 Quasar variabilities and accretion rates
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See also:
J/A+A/525/A37 : Variability indexes of QSOs in SDSS Stripe 82 (Meusinger+ 2011)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/3916] Sequential number
6- 23 A18 --- SDSS SDSS designation hhmmss.ss+ddmmss.s
25- 32 F8.4 deg RAdeg Right Ascension J2000.0 (degree)
34- 40 F7.4 deg DEdeg Declination J2000.0 (degree)
43- 52 E10.5 --- zsp [0.7/1.7] Spectroscopic redshift (1)
55- 58 I4 --- Plate Spectroscopic plate number (1)
61- 63 I3 --- Fiber Spectroscopic fiber number (1)
66- 70 I5 --- MJD MJD of spectroscopic observation (1)
73- 78 F6.3 [10-7W] logLbol Log Bolometric luminosity (1)
81- 90 E10.5 [10-7W] e_logLbol Error in logLbol (1)
92- 98 F7.4 [Msun] logMbh ?=-9.9999 Log Black hole mass (1)
100-110 E11.5 [Msun] e_logMbh ?=-9.9999 Error in logMass (1)
112-122 E11.5 [-] logEdd ?=-999 Log Eddington ratio log(Lbol/Ledd) (1)
124-129 F6.3 [K] logT* ?=-9.999 Log temperature parameter
131-140 E10.4 --- alphal Spectral index αλ
[log(Fλ)/log(λ)]
142-151 E10.4 Msun/yr Acc ?=-9.999 Accretion rate (2)
153-162 E10.4 --- eta ?=-9.999 Radiative efficiency η (2)
164-172 E9.3 mag+2 Vu ?=-9.99 u band variability (3)
174-182 E9.3 mag+2 Vg ?=-9.99 g band variability (3)
184-192 E9.3 mag+2 Vr ?=-9.99 r band variability (3)
194-202 E9.3 mag+2 Vi ?=-9.99 i band variability (3)
204-212 E9.3 mag+2 Vz ?=-9.99 z band variability (3)
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Note (1): from Shen et a. (2011ApJS..194...45S 2011ApJS..194...45S)
Note (2): using the scaling relation from Davis & Laor (2011ApJ...728...98D 2011ApJ...728...98D)
Note (3): from Meusinger, Hinze & de Hoon (2011, Cat. J/A+A/525/A37):
variance of the magnitude differences from all those pairs of two
measurements that have rest-frame time-lags between 1 and 2 yr.
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Acknowledgements:
Helmut Meusinger, meus(at)tls-tautenburg.de
(End) Helmut Meusinger [TLS, Germany], Patricia Vannier [CDS] 17-Dec-2013