J/AJ/141/137 Pittsburgh SDSS Mg II QSO catalog (Quider+, 2011)
The Pittsburgh Sloan Digital Sky Survey Mg II quasar absorption-line survey
catalog.
Quider A.M., Nestor D.B., Turnshek D.A., Rao S.M., Monier E.M.,
Weyant A.N., Busche J.R.
<Astron. J., 141, 137 (2011)>
=2011AJ....141..137Q 2011AJ....141..137Q (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Redshifts ; Equivalent widths ; Photometry, SDSS
Keywords: galaxies: ISM - quasars: absorption lines
Abstract:
We present a catalog of intervening Mg II quasar absorption-line systems
in the redshift interval 0.36≤z≤2.28. The catalog was built from
Sloan Digital Sky Survey Data Release Four (SDSS DR4, Cat. II/267) quasar
spectra. Currently, the catalog contains ∼17000 measured Mg II doublets.
We also present data on the ∼44600 quasar spectra which were searched
to construct the catalog, including redshift and magnitude information,
continuum-normalized spectra, and corresponding arrays of redshift-dependent
minimum rest equivalent widths detectable at our confidence threshold.
The catalog is available online. A careful second search of 500 random
spectra indicated that, for every 100 spectra searched, approximately one
significant Mg II system was accidentally rejected. Current plans to expand
the catalog beyond DR4 quasars are discussed. Many Mg II absorbers are
known to be associated with galaxies. Therefore, the combination of large
size and well understood statistics makes this catalog ideal for precision
studies of the low-ionization and neutral gas regions associated with
galaxies at low to moderate redshift. An analysis of the statistics of
Mg II absorbers using this catalog will be presented in a subsequent paper.
Description:
In this paper, we present the current state of our SDSS Mg II absorber
catalog, which is presently complete through SDSS Data Release Four (DR4,
Cat. II/267). As noted above, this contribution represents a continuation
of the work presented by Nestor et al. (2005ApJ...628..637N 2005ApJ...628..637N, hereafter
NTR05) in that we used the method of NTR05; however, we did not use their
measurements of the early data release (EDR) Mg II absorbers. The catalog
contains ∼17000 absorbers in the redshift interval 0.36≤z≤2.28 identified
in ∼44600 SDSS quasar spectra. The catalog, along with other information
(Section 4), is now publicly available at
http://enki.phyast.pitt.edu/PittSDSSMgIIcat.php.
We used four criteria to define the quasar sample: (1) a spectral
classification of 3 or 4, which correspond to QSO or HIZ-QSO, respectively,
(2) z>0.36 to ensure visibility of the Mg II λλ2796,
2803 doublet at the SDSS low wavelength limit of 3820 Å, (3) zstatus>1
to eliminate missing or failed redshift measurements, and (4) i<20 for the
fiber magnitude. Incorporating these criteria into an SQL query of the
SpecPhoto view yielded ∼44600 quasars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 296 44620 SDSS DR4 quasars searched for Mg II
absorber.dat 158 17042 MgII absorber catalog
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See also:
II/267 : The SDSS Photometric Catalog, Release 4
(Adelman-McCarthy+, 2006)
J/AJ/106/848 : QSO MgII absorption line systems (Drinkwater+, 1993)
J/MNRAS/354/L25 : MgII absorbers in SDSS QSOs (Bouche+, 2004)
J/ApJ/639/766 : SDSS-DR3 strong MgII absorbers (Prochter+, 2006)
J/MNRAS/371/495 : Catalogue of 1806 MgII absorbers from SDSS DR3
(Bouche+, 2006)
J/ApJ/660/1093 : Weak MgII absorbers at 0.4<z<2.4 (Narayanan+, 2007)
J/ApJ/679/239 : Associated MgII absorbers (Vanden+, 2008)
J/AJ/141/137 : Pittsburgh SDSS Mg II QSO catalog (Quider+, 2011)
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/ApJS/235/11 : Absorption features in SDSS. I. MgII abs. doublets
(Chen+, 2018)
http://enki.phyast.pitt.edu/PittSDSSMgIIcat.php : The Pitt SDSS MgII Catalog
website
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- QSO SDSS quasar name (JHHMMSS.ss+DDMMSS.s)
21- 25 I5 d MJD [51608/53178] SDSS MJD number
27- 30 I4 --- Plate [266/1822] SDSS plate number
32- 34 I3 --- Fiber [1/640] SDSS fiber number
36- 54 F19.15 deg RAdeg Right Ascension in decimal degrees (J2000)
56- 74 F19.15 deg DEdeg Declination in decimal degrees (J2000)
76- 92 F17.15 --- zem [0.36006/5.41353] Emission redshift
94-110 F17.15 --- e_zem [0/1.5139] Uncertainty in zem
112-129 F18.15 mag umag [15.8212/26.3084] BEST fiber u magnitude (1)
131-148 F18.15 mag gmag [15.5956/25.7876] BEST fiber g magnitude (1)
150-167 F18.15 mag rmag [15.5461/22.640] BEST fiber r magnitude (1)
169-186 F18.15 mag imag [15.4653/20] BEST fiber i magnitude (1)
188-205 F18.15 mag zmag [15.117/21.0230] BEST fiber z magnitude (1)
207-224 F18.15 mag e_umag [0.00299192/10.3904] Uncertainty in umag
226-242 F17.15 mag e_gmag [0.00129368/1.29794] Uncertainty in gmag
244-260 F17.15 mag e_rmag [0.00140985/3.60589] Uncertainty in rmag
262-278 F17.15 mag e_imag [0.00155788/3.83476] Uncertainty in imag
280-296 F17.15 mag e_zmag [0.00344106/2.58665] Uncertainty in zmag
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Note (1): Data obtained from SDSS DR4 (Cat. II/267). We used a SpecPhoto view to
generate the quasar sample to be searched. The view we used was intended to
eliminate all spectra of poor quality, sky spectra, duplicate observations
(those spectra labeled as SECONDARY), and all data outside the primary DR4
survey area. In addition, SpecPhoto contains all of the spectroscopic
information and the most accurate photometric information at the time of the
data release (those observations labeled as BEST) for each included object.
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Byte-by-byte Description of file: absorber.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- QSO SDSS quasar name (JHHMMSS.ss+DDMMSS.s)
21- 25 I5 d MJD [51608/53178] SDSS MJD number
27- 30 I4 --- Plate [266/1822] SDSS plate number
32- 34 I3 --- Fiber [1/640] SDSS fiber number
36- 41 F6.4 --- zabs [0.3674/2.281] MgII absorption redshift
43- 47 F5.3 0.1nm EW-MgII2796 [0.156/6.412] Rest equivalent width of
MgII 2796 line (Å)
49- 53 F5.3 0.1nm e_EW-MgII2796 [0.01/1.889] 1σ error in EW-MgII2796
55- 59 F5.3 0.1nm EW-MgII2803 [0.072/6.936] Rest equivalent width of
MgII 2803 line (Å)
61- 65 F5.3 0.1nm e_EW-MgII2803 [0.011/1.946] 1σ error in EW-MgII2803
67- 72 F6.3 0.1nm EW-FeII2586 [-3.851/22.175]? Rest equivalent width of
FeII 2586 line (Å) (1)
74- 80 F7.3 0.1nm e_EW-FeII2586 [0.012/399.317]? 1σ error in
EW-FeII2586 (1)
82- 87 F6.3 0.1nm EW-FeII2600 [-4.091/30.036]? Rest equivalent width of
FeII 2586 line (Å) (1)
89- 94 F6.3 0.1nm e_EW-FeII2600 [0.012/19.562]? 1σ error in
EW-FeII2600 (1)
96-102 F7.3 0.1nm EW-MnII2576 [-1.259/380.914]? Rest equivalent width of
MnII 2576 line (Å) (1)
104-110 F7.3 0.1nm e_EW-MnII2576 [0.013/386.173]? 1σ error in
EW-MnII2576 (1)
112-119 F8.3 0.1nm EW-MnII2594 [-149.822/72.252]? Rest equivalent width of
MnII 2594 line (Å) (1)
121-127 F7.3 0.1nm e_EW-MnII2594 [0.015/168.683]? 1σ error in
EW-MnII2594 (1)
129-136 F8.3 0.1nm EW-MnII2606 [-877.926/1.939]? Rest equivalent width of
MnII 2606 line (Å) (1)
138-144 F7.3 0.1nm e_EW-MnII2606 [0.004/294.893]? 1σ error in
EW-MnII2606 (1)
146-151 F6.3 0.1nm EW-MgI2852 [-1.353/3.075]? Rest equivalent width of
MgI 2852 line (Å) (1)
153-158 F6.3 0.1nm e_EW-MgI2852 [0/16.194]? 1σ error in EW-MgI2852 (1)
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Note (1): In addition to the measurements of Mg II λλ2796, 2803
doublets, we also made rest equivalent width measurements at the predicted
locations of six additional absorption lines (Fe II λλ2586,
2600, Mn II λλ2576, 2594, 2606, and Mg I λ2852) for all
of the systems in the catalog, when possible.
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History:
Copied at http://enki.phyast.pitt.edu/PittSDSSMgIIcat.php
(End) Tiphaine Pouvreau [CDS] 04-Aug-2012