J/ApJS/235/11 Absorption features in SDSS. I. MgII abs. doublets (Chen+, 2018)
The associated absorption features in quasar spectra of the Sloan Digital Sky
Survey.
I. Mg II absorption doublets.
Chen Z.-F., Huang W.-R., Pang T.-T., Huang H.-Y., Pan D.-S., Yao M.,
Nong W.-J., Lu M.-M.
<Astrophys. J. Suppl. Ser., 235, 11 (2018)>
=2018ApJS..235...11C 2018ApJS..235...11C
ADC_Keywords: QSOs; Spectra, optical; Redshifts; Radial velocities;
Equivalent widths; Surveys
Keywords: catalogs; galaxies: halos; line: identification;
quasars: absorption lines
Abstract:
Using the SDSS spectra of quasars included in the DR7Q or DR12Q
catalogs, we search for MgIIλλ2796,2803 narrow
absorption doublets in the spectra data around MgIIλ2798
emission lines. We obtain 17316 MgII doublets, within the redshift
range of 0.3299≤zabs≤2.5663. We find that a velocity offset of
υr<6000km/s is a safe boundary to constrain the vast
majority of associated Mg ii systems, although we find some doublets
at υr>6000km/s. If associated Mg ii absorbers are defined by
υr<6000km/s, ∼33.3% of the absorbers are supposed to be
contaminants of intervening systems. Removing the 33.3% contaminants,
∼4.5% of the quasars present at least one associated MgII system with
Wrλ2796≥0.2Å. The fraction of associated MgII systems
with high-velocity outflows correlates with the average luminosities
of their central quasars, indicating a relationship between outflows
and the quasar feedback power. The υr distribution of the
outflow MgII absorbers is peaked at 1023km/s, which is smaller than
the corresponding value of the outflow CIV absorbers. The redshift
number density evolution of absorbers (dn/dz) limited by
υr>-3000km/s differs from that of absorbers constrained by
υr>2000km/s. Absorbers limited by υr>2000km/s and
higher values exhibit profiles similar to dn/dz. In addition, the
dn/dz is smaller when absorbers are constrained with larger
υr. The distributions of equivalent widths, and the ratio of
Wrλ2796/Wrλ2803, are the same for associated and
intervening systems, and independent of quasar luminosity.
Description:
The Legacy surveys of the SDSS spectroscopically mapped objects from
optical to near-infrared bands at a resolution of R∼2000. The first
(SDSS-I, 2000-2005) and second (SDSS-II, 2005-2008) stages of the SDSS
produced spectra in a wavelength range of λ=3800-9200Å
(Abazajian+ 2009, II/294). The SDSS-I/II obtained 105783
spectroscopically confirmed quasars (DR7Q; Schneider+ 2010, VII/260).
In the third stage of the SDSS, the BOSS produces spectra with
coverage from λ=3600 to 10400Å (Alam+ 2015, V/147). BOSS
spectroscopically mapped 297301 unique quasars (DR12Q; Paris+ 2017,
VII/279).
Our quasar sample is sourced from the quasar catalogs of DR7Q and
DR12Q.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 198229 Catalog of quasar spectra searched for MgII
absorption systems
table2.dat 76 17316 Catalog of MgII absorption systems
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)
J/MNRAS/354/L25 : MgII absorbers in SDSS QSOs (Bouche+, 2004)
J/ApJ/613/129 : Equivalent widths of QSOs (Wise+, 2004)
J/ApJ/639/766 : SDSS-DR3 strong MgII absorbers (Prochter+, 2006)
J/MNRAS/371/495 : Catalog of 1806 MgII absorbers from SDSS DR3 (Bouche+, 2006)
J/ApJS/171/1 : Census of QSOs Narrow Absorption Lines (Misawa+, 2007)
J/ApJ/679/239 : Associated MgII absorbers (Vanden+, 2008)
J/ApJ/714/1521 : Spectroscopy of galaxies around distant QSOs (Chen+, 2010)
J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)
J/MNRAS/413/813 : ATLAS3D project. I. (Cappellari+, 2011)
J/ApJ/754/38 : MgII abs. syst. for Flat-Spectrum Radio QSOs (Chand+, 2012)
J/ApJ/748/131 : MgII absorbers in SDSS-DR7 quasar catalog (Shen+, 2012)
J/ApJ/779/161 : MgII absorbers in 0.4<z<2.3 SDSS QSOs (Seyffert+, 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/ApJS/210/7 : BOSS narrow CIV absorption lines. I. zem≤2.4 (Chen+, 2014)
J/ApJS/215/12 : BOSS narrow CIV absorption lines. II. zem>2.4 (Chen+, 2014)
J/ApJS/221/32 : Narrow MgII absorption lines from SDSS-DR9Q (Chen+, 2015)
J/MNRAS/450/3904 : Quasars narrow absorption lines from SDSS (Chen+, 2015)
J/MNRAS/462/3285 : XQ-100 targets equivalent widths (Perrotta+, 2016)
J/MNRAS/463/2640 : SDSS-DR12 QSOs MgII absorption systems (Raghunathan+, 2016)
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
--------------------------------------------------------------------------------
1- 19 A19 --- SDSS SDSS identifier (JHHMMSS.ss+DDMMSS.s) (G1)
21- 24 I4 --- Plate SDSS plate number
26- 30 I5 d MJD [51608/56837] Modified Julian Date of
the observation
32- 35 I4 --- Fiber SDSS fiber number
37- 42 F6.4 --- zem [0.3/2.8] Spectroscopic emission line
derived redshift
44- 49 F6.3 [10-7W] logL [43/47.5] log monochromatic flux at 3000Å;
in units of erg/s.
51- 54 F4.1 --- S/N [3/87] Median Signal-to-Noise per pixel
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- SDSS SDSS identifier (JHHMMSS.ss+DDMMSS.s) (G1)
21- 24 I4 --- Plate SDSS plate number
26- 30 I5 d MJD [51608/56837] Modified Julian Date of the
observation
32- 35 I4 --- Fiber SDSS fiber number
37- 42 F6.4 --- zem [0.3/2.6] Spectroscopic emission line
derived redshift
44- 49 F6.4 --- zabs [0.3/2.6] Spectroscopic absorption line
derived redshift
51- 54 F4.2 0.1nm W2796 [0.2/8.3] Equivalent width of
MgII 2796Å line (1)
56- 59 F4.2 0.1nm e_W2796 [0.02/1.7] Uncertainty in W2796 (1)
61- 64 F4.2 0.1nm W2803 [0.2/7.5] Equivalent width of
MgII 2803Å line (1)
66- 69 F4.2 0.1nm e_W2803 [0.02/1.4] Uncertainty in W2803 (1)
71- 76 I6 km/s RV [-10447/11652] Radial velocity
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Note (1): In units of Angstroms.
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Global note:
Note (G1): 198 SDSS (in Table 1) with a wrong IDs have been corrected by CDS --
along with 38 MJDs.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Aug-2018