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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Jun-2012
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