J/ApJS/215/12 BOSS narrow CIV absorption lines. II. zem>2.4 (Chen+, 2014)
Catalog of narrow C IV absorption lines in BOSS.
II. For quasars with zem> 2.4.
Chen Z.-F., Qin Y.-P., Qin M., Pan C.-J., Pan D.-S.
<Astrophys. J. Suppl. Ser., 215, 12 (2014)>
=2014ApJS..215...12C 2014ApJS..215...12C
ADC_Keywords: Redshifts ; Equivalent widths ; QSOs ; Surveys
Keywords: quasars: absorption lines; quasars: general
Abstract:
As the second work in a series of papers aiming to detect absorption
systems in the quasar spectra of the Baryon Oscillation Spectroscopic
Survey, we continue the analysis of Paper I (Chen+, 2014, J/ApJS/210/7;
2014ApJS..212...17C 2014ApJS..212...17C) by expanding the quasar sample to those quasars
with zem>2.4. This yields a sample of 21963 appropriate quasars to
search for narrow CIVλλ1548,1551 absorptions with
Wr≥0.2Å for both lines. There are 9708 quasars with at least one
appropriate absorption system imprinted on their spectra. From these
spectra, we detect 13919 narrow C IV absorption systems whose
absorption redshifts cover a range of zabs=1.8784-4.3704. In this
paper and Paper I, we have selected 37241 appropriate quasars with
median S/N≥4 and 1.54≲zem≲5.16 to visually analyze narrow
CIVλλ1548,1551 absorption doublets one by one. A total
of 15999 quasars are found to have at least one appropriate absorption
system imprinted on their spectra. From these 15999 quasar spectra, we
have detected 23336 appropriate CIVλλ1548,1551
absorption systems with Wr≥0.2Å whose absorption redshifts cover
a range of zabs=1.4544-4.3704. The largest values of Wr are
3.19Å for the λ1548 absorption line and 2.93Å for the
λ1551 absorption line, respectively. We find that only a few
absorbers show large values of Wr. About 1.1% of the total absorbers
have Wrλ1548≥2.0Å.
Description:
We identify absorption doublets, such as CIVλλ1548,1551
in the quasar spectra of the Baryon Oscillation Spectroscopic Survey
(BOSS), which is a part of the SDSS-III (Eisenstein et al.
2011AJ....142...72E 2011AJ....142...72E). This work continues the analysis of Paper I
(Chen+, 2014, J/ApJS/210/7; 2014ApJS..212...17C 2014ApJS..212...17C) by expanding the
quasar sample to those quasars with zem>2.4.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 90 13919 Catalog of CIVλλ1548,1551
absorption systems for 9708 quasars
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See also:
VII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012)
J/ApJS/210/7 : BOSS narrow CIV absorption lines. I. zem≤2.4 (Chen+, 2014)
J/ApJ/763/37 : Metals in SDSS QSOs I. 1.5<z<4.5 CIV absorbers (Cooksey+, 2013)
J/ApJS/199/3 : The quasars MMT-BOSS pilot survey (Ross+, 2012)
J/ApJ/666/757 : CIV 1549Å emission line in AGNs (Sulentic+, 2007)
J/ApJ/641/78 : CIV variability in 105 SDSS quasars (Wilhite+, 2006)
J/A+A/283/759 : CIV QSO absorption systems (Petitjean+ 1994)
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-DR9 identifier (HHMMSS.ss+DDMMSS.s; J2000)
20- 23 I4 --- Plate SDSS plate identifier
25- 29 I5 d MJD Modified Julian Date of the observation
31- 34 I4 --- Fiber SDSS fiber identifier
36- 41 F6.4 --- zem [2.4/5.2] Redshift derived from emission lines
43- 48 F6.4 --- zabs [1.8/4.4] Redshift derived from absorption lines
50- 53 F4.2 0.1nm EW1548 [0.2/3] Rest equivalent width of CIV 1548 (Å)
55- 59 F5.2 --- s1548 [2/68] EW1548 divided by its 1σ error:
significance level of CIV 1548 detection
61- 64 F4.2 0.1nm EW1551 [0.2/3] Rest equivalent width of CIV 1551 (Å)
66- 70 F5.2 --- s1551 EW1551 divided by its 1σ error:
significance level of CIV 1551 detection
72- 76 F5.2 --- SNR1548 [1.9/55] Signal-to-noise ratio of CIV1548 line
78- 82 F5.2 --- SNR1551 [0.9/51] Signal-to-noise ratio of CIV1551 line
84- 90 F7.5 --- beta [0.03/0.2] Relative velocity β (1)
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Note (1): β=v/c=((1+zem)2-(1+zabs)2)/((1+zem)2+(1+zabs)2)
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History:
From electronic version of the journal
06-Feb-2015: Insert into VizieR
10-Feb-2016: 10 SDSS identifiers corrected
References:
Chen et al. Paper I. 2014ApJS..210....7C 2014ApJS..210....7C Cat. J/ApJS/210/7
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Jan-2015