J/ApJ/665/990 SDSS DR2 BAL QSOs (Ganguly+, 2007)
Outflows and the physical properties of quasars.
Ganguly R., Brotherton M.S., Cales S., Scoggins B., Shang Z., Vestergaard M.
<Astrophys. J., 665, 990-1003 (2007)>
=2007ApJ...665..990G 2007ApJ...665..990G
ADC_Keywords: QSOs ; Redshifts ; Spectroscopy
Keywords: quasars: absorption lines - quasars: general
Abstract:
We have investigated a sample of 5088 quasars from the SDSS DR2 in
order to determine how the frequency and properties of BALs depend on
black hole mass, bolometric luminosity, Eddington fraction (L/LEdd),
and spectral slope. We focus only on high-ionization BALs and find a
number of significant results. While quasars accreting near the
Eddington limit are more likely to show BALs than lower L/LEdd
systems, BALs are present in quasars accreting at only a few percent
Eddington. We find a stronger effect with bolometric luminosity, such
that the most luminous quasars are more likely to show BALs. There is
an additional effect, previously known, that BAL quasars are redder on
average than unabsorbed quasars. The strongest effects involving the
quasar physical properties and BAL properties are related to terminal
outflow velocity. Maximum observed outflow velocities increase with
both the bolometric luminosity and the blueness of the spectral slope,
suggesting that the ultraviolet luminosity to a great extent
determines the acceleration. These results support the idea of outflow
acceleration via ultraviolet line scattering.
Description:
Our sample comes from the SDSS Data Release 2.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 97 4858 Measured and derived quasar parameters
--------------------------------------------------------------------------------
See also:
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SDSS]
6- 25 A20 --- SDSS Object SDSS name (JHHMMSS.ss+DDMMSS.ss)
27- 31 I5 d MJD Modified Julian Day of observation
33- 36 I4 --- Plate Plate number of observation
38- 40 I3 --- Fiber Fiber number of observation
42- 49 F8.6 --- z Quasar Redshift
51- 57 F7.4 10-19W/m2/nm F3000 Flux density at 3000 Angstroms (1)
59- 63 F5.3 --- alpha Power-law index at 3000 Angstroms (2)
65- 71 F7.3 10+38W L3000 Luminosity at 3000 Angstroms
73- 77 I5 km/s FWMH The Mg II emission-line FWHM
79- 84 F6.3 10+8solMass Mass Black hole mass estimate
86- 91 F6.4 --- ERatio Eddington ratio
93 I1 --- Fit [1/5] Fitting run that provided the best
fit (3)
95- 97 A3 --- Qcl Quasar classification (4)
--------------------------------------------------------------------------------
Note (1): In units of 10-17erg/s/cm2/Angstrom.
Note (2): Where F~λ-α.
Note (3): See table3 in the paper.
Note (4): Quasar classification as follows:
Reg = Unabsorbed quasar (see text)
BAL = broad absorptions line quasar
AAL = "associated" absorption line quasar
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 06-Sep-2009