J/ApJ/824/130 SDSS/BOSS/TDSS CIV BAL quasars (Grier+, 2016)
C IV broad absorption line acceleration in Sloan Digital Sky Survey quasars.
Grier C.J., Brandt W.N., Hall P.B., Trump J.R., Filiz Ak N., Anderson S.F.,
Green P.J., Schneider D.P., Sun M., Vivek M., Beatty T.G., Brownstein J.R.,
Roman-Lopes A.
<Astrophys. J., 824, 130-130 (2016)>
=2016ApJ...824..130G 2016ApJ...824..130G (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Surveys ; Magnitudes, absolute ; Redshifts
Keywords: galaxies: active; galaxies: nuclei; quasars: absorption lines
Abstract:
We present results from the largest systematic investigation of broad
absorption line (BAL) acceleration to date. We use spectra of 140
quasars from three Sloan Digital Sky Survey programs to search for
global velocity offsets in BALs over timescales of ∼2.5-5.5 years in
the quasar rest frame. We carefully select acceleration candidates by
requiring monolithic velocity shifts over the entire BAL trough,
avoiding BALs with velocity shifts that might be caused by profile
variability. The CIV BALs of two quasars show velocity shifts
consistent with the expected signatures of BAL acceleration, and the
BAL of one quasar shows a velocity-shift signature of deceleration. In
our two acceleration candidates, we see evidence that the magnitude of
the acceleration is not constant over time; the magnitudes of the
change in acceleration for both acceleration candidates are difficult
to produce with a standard disk-wind model or via geometric projection
effects. We measure upper limits to acceleration and deceleration for
76 additional BAL troughs and find that the majority of BALs are
stable to within about 3% of their mean velocities. The lack of
widespread acceleration/deceleration could indicate that the gas
producing most BALs is located at large radii from the central black
hole and/or is not currently strongly interacting with ambient
material within the host galaxy along our line of sight.
Description:
We began with the 2005 targets from the BAL catalog of Gibson et al.
(2009, J/ApJ/692/758), which were observed by SDSS and targeted for
additional observations with Baryon Oscillation Spectroscopic Survey
(BOSS; Eisenstein et al. 2011AJ....142...72E 2011AJ....142...72E; Dawson et al.
2013AJ....145...10D 2013AJ....145...10D) and Time Domain Spectroscopic Survey (TDSS;
Morganson et al. 2015ApJ...806..244M 2015ApJ...806..244M). We then searched for BOSS and
TDSS observations of these targets as of 2015 June 30, identifying 172
targets that were observed by all three surveys.
We restricted the redshift range of our sample to 1.5<z<5 to ensure
good coverage of the CIV region and to a signal-to-noise ratio
(S/N1700) equal to or greater than 6. See section 2.1 for further
details.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 149 140 Quasar observation information
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See also:
VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)
VII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014)
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/MNRAS/454/3962 : 188 CIV BAL QSOs from SDSS DR7 (He+, 2015)
J/MNRAS/449/1593 : CIV absorption in BAL QSOs (Baskin+, 2015)
J/MNRAS/440/799 : BAL QSOs MgII & AlIII variability (Vivek+, 2014)
J/ApJS/215/12 : BOSS narrow CIV absorption lines. II. zem>2.4 (Chen+, 2014)
J/ApJS/210/7 : BOSS narrow CIV absorption lines. I. zem≤2.4 (Chen+, 2014)
J/ApJ/778/98 : Cross-correlation of SDSS QSOs & BOSS galaxies (Shen+, 2013)
J/ApJ/777/168 : CIV & SiIV BAL troughs in SDSS (Filiz+, 2013)
J/ApJ/763/37 : SDSS QSOs. I. 1.5<z<4.5 CIV absorbers (Cooksey+, 2013)
J/ApJS/199/3 : The quasars MMT-BOSS pilot survey (Ross+, 2012)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)
J/ApJ/709/611 : The multi-component absorber QSO 0318-0600 (Dunn+, 2010)
J/ApJ/696/924 : UV and X-Ray radio-quiet QSOs (Gibson+, 2009)
J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)
J/ApJ/692/758 : BAL QSOs in SDSS-DR5 (Gibson+, 2009)
J/ApJ/685/773 : X-ray-UV relations in SDSS DR5 QSOs (Gibson+, 2008)
J/ApJ/613/682 : AGN central masses & broad-line sizes (Peterson+, 2004)
J/A+AS/123/529 : UV-excess quasar candidates around NGC 450 (Gosset+ 1997)
J/A+A/283/759 : CIV QSO absorption systems (Petitjean+ 1994)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS identifier (JHHMMSS.ss+DDMMSS.s)
21- 28 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000)
30- 36 F7.4 deg DEdeg Declination in decimal degrees (J2000)
38- 42 F5.3 --- z [1.6/4] Spectroscopic redshift (1)
44- 49 F6.2 mag iMag [-28.7/-25.8] Absolute i band magnitude (2)
51- 60 A10 "Y/M/D" SDSS.date UT date of SDSS observation
62- 65 I4 --- SDSS-Plt Plate identifier of SDSS observation
67- 71 I5 d SDSS-MJD Modified Julian Date of SDSS observation
73- 76 I4 --- SDSS-Fib Fiber identifier of SDSS observation
78- 87 A10 "Y/M/D" BOSS.date UT date of BOSS observation
89- 92 I4 --- BOSS-Plt Plate identifier of BOSS observation
94- 98 I5 d BOSS-MJD Modified Julian Date of BOSS observation
100-103 I4 --- BOSS-Fib Fiber identifier of BOSS observation
105-114 A10 "Y/M/D" TDSS.date UT date of TDSS observation
116-119 I4 --- TDSS-Plt Plate identifier of TDSS observation
121-125 I5 d TDSS-MJD Modified Julian Date of TDSS observation
127-130 I4 --- TDSS-Fib Fiber identifier of TDSS observation
132-135 F4.1 --- SDSS-1700 [6/34] SDSS Signal-to-Noise at 1700 Angstroms
137-140 F4.1 --- BOSS-1700 [6/38] BOSS Signal-to-Noise at 1700 Angstroms
142-145 F4.1 --- TDSS-1700 [6/66] TDSS Signal-to-Noise at 1700 Angstroms
147-149 A3 --- Best Best-fit profile for CIV emission line (3)
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Note (1): From Hewett & Wild (2010, J/MNRAS/405/2302).
Note (2): Unless otherwise marked magnitudes are from the DR12 quasar catalog
(Paris et al. 2015, submitted; arXiv:1608.06483).
Note (3): Best-fit profile for CIV emission line as follows:
G-H = Gauss-Hermite;
2-G = Double-Gaussian;
V = Voigt profile.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Aug-2016