J/AJ/140/817 SDSS-DR3 OVI QSOs absorbers (Frank+, 2010)
A survey of metal lines at high-redshift. I. SDSS absorption line studies.
The methodology and first search results for O VI.
Frank S., Mathur S., Pieri M., York D.G.
<Astron. J., 140, 817-834 (2010)>
=2010AJ....140..817F 2010AJ....140..817F
ADC_Keywords: QSOs ; Spectroscopy ; Redshifts
Keywords: intergalactic medium - quasars: absorption lines
Abstract:
We report the results of a systematic search for signatures of metal
lines in quasar spectra of the Sloan Digital Sky Survey (SDSS) data
release 3 (DR3), focusing on finding intervening absorbers via
detection of their OVI doublet. Here, we present the search algorithm
and criteria for distinguishing candidates from spurious Lyα
forest lines. In addition, we compare our findings with simulations of
the Lyα forest in order to estimate the detectability of OVI
doublets over various redshift intervals. We have obtained a sample of
1756 OVI doublet candidates with rest-frame equivalent width
(EW)≥0.05Å in 855 active galactic nuclei spectra (out of 3702
objects with redshifts in the accessible range for OVI detection).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 51 1866 List of OVI absorber candidates in all 3702
SDSS QSO spectra of the survey
table3.dat 110 69 Details for category 1 OVI absorber candidates
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See also:
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+ 2007)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/1866] Internal catalogue number
6- 9 I4 --- Plate SDSS Plate number
11- 13 I3 --- Fiber SDSS Fiber number
15- 19 I5 d MJD SDSS Modified Julian Date of exposure
21- 27 F7.4 --- zem Spectroscopic emission redshift of QSO
29- 35 F7.4 --- zabs Redshift of OVI absorber
37- 40 F4.1 --- SNR Signal-to-noise ratio within Lyman forest
43 I1 --- Qual [1/3] Quality flag: 1=excellent, 2=mediocre,
3=extremely poor
45- 51 F7.4 --- beta Velocity difference beta, δV/c
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Plate SDSS Plate number
6- 8 I3 --- Fiber SDSS Fiber number
10- 14 I5 d MJD SDSS Modified Julian Date of exposure
16- 22 F7.4 --- zem Spectroscopic emission redshift of QSO
24- 30 F7.4 --- zabs Redshift of OVI absorber
32- 38 F7.4 --- SNR Signal-to-noise ratio within Lyman forest
40- 46 F7.1 0.1nm lam1548 ? Wavelength(Å) of QSOALS CIV 1548 detection
48- 54 F7.1 0.1nm lam1550 ? Wavelength(Å) of QSOALS CIV 1550 detection
56- 62 F7.1 0.1nm lam1335 ? Wavelength(Å) of QSOALS CII 1335 detection
64- 70 F7.1 0.1nm lam1394 ? Wavelength(Å) of QSOALS SiIV 1394 detection
72- 78 F7.1 0.1nm lam1402 ? Wavelength(Å) of QSOALS SiIV 1402 detection
80- 86 F7.1 0.1nm lam1671 ? Wavelength(Å) of QSOALS AlII 1671 detection
88- 94 F7.1 0.1nm lam1855 ? Wavelength(Å) of QSOALS AlIII 1855 detection
96-102 F7.1 0.1nm lam1863 ? Wavelength(Å) of QSOALS AlIII 1863 detection
104-110 F7.4 --- zQSOALS ? Redshift of QSOALS system
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Jun-2012