The associated absorption features in quasar spectra of the Sloan Digital Sky Survey. I. Mg II absorption doublets. (2018)
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 MgII{lambda}{lambda}2796,2803 narrow absorption doublets in the spectra data around MgII{lambda}2798 emission lines. We obtain 17316 MgII doublets, within the redshift range of 0.3299<=z_abs_<=2.5663. We find that a velocity offset of {upsilon}_r_<6000km/s is a safe boundary to constrain the vast majority of associated Mg ii systems, although we find some doublets at {upsilon}_r_>6000km/s. If associated Mg ii absorbers are defined by {upsilon}_r_<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
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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 {lambda}=3800-9200{AA}
(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 {lambda}=3600 to 10400{AA} (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.
- 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
- 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
