J/ApJS/221/32 Narrow MgII absorption lines from SDSS-DR9Q (Chen+, 2015)
Catalog of narrow Mg II absorption lines in the Baryon Oscillation
Spectroscopic Survey.
Chen Z.-F., Gu Q.-S., Chen Y.-M.
<Astrophys. J. Suppl. Ser., 221, 32 (2015)>
=2015ApJS..221...32C 2015ApJS..221...32C (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Equivalent widths ; Redshifts ; Spectroscopy ; Surveys
Keywords: line: identification; quasars: absorption lines; quasars: general
Abstract:
Using the Data Release 9 Quasar spectra from the Baryonic Oscillation
Spectroscopic Survey, which does not include quasar spectra from the
Sloan Digital Sky Survey Data Release 7, we detect narrow
MgIIλλ2796,2803 absorption doublets in the spectral data
redward of 1250Å (quasar rest frame) until the red wing of the
MgIIλ2800 emission line. Our survey is limited to quasar
spectra with a median signal-to-noise ratio <S/N>≥4/pixel in the
surveyed spectral region, resulting in a sample that contains 43260
quasars. We have detected a total of 18598 MgII absorption doublets
with 0.2933≤zabs≤2.6529. About 75% of absorbers have an equivalent
width at rest frame of Wrλ2796. About 75% of absorbers have
doublet ratios (DR=Wrλ2796/Wrλ2803) in the range
of 1≤DR≤2, and about 3.2% lie outside the range of
1-σDR≤DR≤2+σDR. We characterize the detection false
positives/negatives by the frequency of detected MgII absorption
doublets in the limits of the S/N of the spectral data. The S/N=4.5
limit is assigned a completeness fraction of 53% and tends to be
complete when the S/N is greater than 4.5. The redshift number
densities of all of the detected MgII absorbers moderately increase
from z∼0.4 to z∼1.5, which parallels the evolution of the cosmic star
formation rate density. Limiting our investigation to those quasars
whose emission redshift can be determined from narrow emission lines,
the relative velocities (β) of MgII absorbers have a complex
distribution which probably consists of three classes of MgII
absorbers: (1) cosmologically intervening absorbers; (2) environmental
absorbers that reside within the quasar host galaxies or galaxy
clusters; (3) quasar outflow absorbers. After subtracting
contributions from cosmologically intervening absorbers and
environmental absorbers, the β distribution of the MgII might
mainly be contributed by the quasar outflow absorbers and peaks at
υ∼1500km/s. This peak velocity is lower than the value of
2000km/s found in statistical analysis of CIV absorbers.
Description:
The Baryonic Oscillation Spectroscopic Survey (BOSS) project (Dawson
et al. 2013AJ....145...10D 2013AJ....145...10D) of SDSS-III (Eisenstein et al.
2011AJ....142...72E 2011AJ....142...72E) uses upgraded versions of the SDSS spectrographs
mounted on the Sloan 2.5m telescope at Apache Point, New Mexico. The
spectra are taken through 2" diameter fibers and cover a wavelength
range from 3600 to 10400Å with a resolution of R∼2000 and a
dispersion of 69km/s/pixel.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 91 18598 Catalog of Mg II absorption systems
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See also:
VII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012)
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/ApJS/215/12 : BOSS narrow CIV absorption lines. II. zem>2.4 (Chen+, 2014)
J/MNRAS/444/1747 : CaII absorbers in SDSS QSOs (Sardane+, 2014)
J/ApJS/210/7 : BOSS narrow CIV absorption lines. I. zem≤2.4 (Chen+, 2014)
J/ApJ/779/161 : MgII absorbers in 0.4<z<2.3 SDSS QSOs (Seyffert+, 2013)
J/ApJ/776/114 : MAGIICAT. I. MgII Absorber-Galaxy Catalog (Nielsen+, 2013)
J/MNRAS/434/163 : QSOs narrow absorption line variability (Hacker+, 2013)
J/PASJ/65/8 : Catalog of SDSS quasar absorption redshift (Qin+, 2013)
J/ApJ/763/37 : Metals in SDSS QSOs I. CIV absorbers (Cooksey+, 2013)
J/ApJ/761/112 : High-redshift MgII absorption QSO with FIRE (Matejek+, 2012)
J/ApJ/748/131 : MgII absorbers in SDSS-DR7 quasar catalog (Shen+, 2012)
J/AJ/142/122 : SDSS DR7 galaxy/QSOs pairs (Cherinka+, 2011)
J/AJ/141/137 : Pittsburgh SDSS Mg II QSO catalog (Quider+, 2011)
J/ApJ/729/87 : SiIV absorption systems (Cooksey+, 2011)
J/ApJ/727/47 : The MgII cross-section of red galaxies (Bowen+, 2011)
J/ApJ/724/L176 : MgII absorbing gas around galaxies (Chen+, 2010)
J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)
J/ApJ/714/1521 : Spectroscopy of galaxies around distant QSOs (Chen+, 2010)
J/ApJ/708/868 : CIV candidates (Cooksey+, 2010)
J/ApJ/698/819 : MgII and LRGs cross-correlation analysis (Lundgren+, 2009)
J/ApJ/679/239 : Associated MgII absorbers (Vanden+, 2008)
J/ApJ/660/1093 : Weak MgII absorbers at 0.4<z<2.4 (Narayanan+, 2007)
J/MNRAS/371/495 : Catalog of 1806 MgII absorbers from SDSS DR3 (Bouche+, 2006)
J/ApJ/639/766 : SDSS-DR3 strong MgII absorbers (Prochter+, 2006)
J/AJ/127/2002 : Star Formation Rate of NFGS galaxies (Kewley+, 2004)
http://www.sdss3.org/ : SDSS-III home page
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-DR9Q identifier (VII/269;
HHMMSS.ss+DDMMSS.s; J2000)
20- 23 I4 --- Plate SDSS plate identifier
25- 29 I5 d MJD [55176/55752] Modified Julian Date
of the observation
31- 34 I4 --- Fiber SDSS fiber identifier
36- 41 F6.4 --- zem [0.35/5.4] Redshift derived from emission lines
43- 48 F6.4 --- zabs [0.29/2.7] Redshift derived from
absorption lines
50- 53 F4.2 0.1nm EW2796 [0.2/8.2] Rest equivalent width of
MgIIλ2796 (Å)
55- 59 F5.2 --- s2796 [2/71] EW2796 divided by its 1σ error;
significance of MgIIλ2796 detection
61- 64 F4.2 0.1nm EW2803 [0.2/7.1] Rest equivalent width of
MgIIλ2803 (Å)
66- 70 F5.2 --- s2803 [2/65] EW2803 divided by its 1σ error;
significance of MgIIλ2803 detection
72- 76 F5.2 --- SNR2796 [1.9/63] Signal-to-noise ratio of
MgIIλ2796 line
78- 82 F5.2 --- SNR2803 [1.9/60] Signal-to-noise ratio of
MgIIλ2803 line
84- 91 F8.5 --- beta [-0.02/0.74] Relative velocity, β (1)
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Note (1): Where β=[(1+zem)2-(1+zabs)2]/[(1+zem)2+(1+zabs)2]
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Jan-2016