J/MNRAS/444/1747 CaII absorbers in SDSS QSOs (Sardane+, 2014)
Ca II absorbers in the Sloan Digital Sky Survey: statistics.
Sardane G.M., Turnshek D.A., Rao S.M.
<Mon. Not. R. Astron. Soc., 444, 1747-1758 (2014)>
=2014MNRAS.444.1747S 2014MNRAS.444.1747S
ADC_Keywords: QSOs ; Redshifts ; Equivalent widths
Keywords: catalogues - quasars: absorption lines
Abstract:
We present the results of a survey for CaII λλ3934,3969
absorption-line systems culled from ∼95000 Sloan Digital Sky Survey
(SDSS) Data Release 7 and Data Release 9 quasar spectra. With 435
doublets identified in the catalogue, this list is the largest CaII
catalogue compiled to date, spanning redshifts z<1.34, which
corresponds to the most recent ∼8.9Gyr of the history of the
Universe. We derive statistics on the Caii rest equivalent width
distribution and incidence. We find that the λ3934 rest
equivalent width (W0λ3934) distribution cannot be described
by a single exponential function. A double exponential function is
required to produce a satisfactory description.
Description:
In order to ensure adequate signal-to-noise ratios, we restricted the
quasar sample to SDSS fibre magnitudes of i<20, and to minimize the
incidence of galaxies that have been misidentified as quasars, we only
considered quasars with zem≥0.1. In addition, we searched for
CaII at wavelengths greater than 6000km/s redward of the quasar
Lyα emission line. The quasar with the highest redshift in our
sample has zem=6.0. We used the catalogues compiled by Shen et al.
(2011ApJS..194...45S 2011ApJS..194...45S, Cat. J/ApJS/194/45) for SDSS DR7, and extended
by Paris et al. (2012A&A...548A..66P 2012A&A...548A..66P, Cat. VII/270) for SDSS DR9, to
exclude broad absorption-line quasars from our search.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 62 435 The CaII absorbers from SDSS-DR9
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See also:
VII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- QSO Quasar name, JHHMMSS.ss+DDMMSS.s
21- 25 F5.3 --- zem [0.1/4.3] Emission redshift
27- 32 F6.4 --- zabs [0.02/1.35] Absorption redshift
34- 38 F5.2 mag gmag [16.4/22] SDSS g magnitude
40- 44 F5.3 0.1nm W0a [0.1/2.6] λ3934 rest equivalent width
46- 50 F5.3 0.1nm e_W0a [0.02/0.39] rms uncertainty on W0a
52- 56 F5.3 0.1nm W0b [0.1/1.6] λ3969 rest equivalent width
58- 62 F5.3 0.1nm e_W0b [0.02/0.49] rms uncertainty on W0b
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Apr-2015