J/MNRAS/354/L31 SDSS DR2 QSO and DLA properties (Murphy+, 2004)
Dust-reddening and gravitational lensing of SDSS QSOs due to foreground damped Lyman α systems. Murphy M.T., Liske J. <Mon. Not. R. Astron. Soc., 354, L31-L36 (2004)> =2004MNRAS.354L..31M
ADC_Keywords: QSOs ; Redshifts ; Equivalent widths Keywords: dust, extinction - galaxies: high-redshift - intergalactic medium - galaxies: ISM - quasars: absorption line Abstract: We use Sloan Digital Sky Survey (SDSS) Data Release 2 quasi-stellar object (QSO) spectra to constrain the dust-reddening caused by intervening damped Lyman α systems (DLAs). Comparing the spectral index distribution of a 70 sight-line DLA sample with that of a large control sample reveals no evidence for dust-reddening at z∼3. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 97 1979 Catalogue of DR2 QSO and DLA properties.
See also: J/AJ/126/2579 : SDSS quasar catalog. First data release (Schneider+, 2003) J/MNRAS/354/L25 : MgII absorbers in SDSS QSOs (Bouche+, 2004) http://www.sdss.org/dr2 : SDSS-DR2 Home Page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 18 A18 --- SDSS SDSS J2000 name of the QSO derived from the RA and DEC supplied in the FITS headers of the spectra (HHMMSS.ss+DDMMSS.s) 20- 25 F6.4 --- z SDSS emission redshift of the QSO given in the FITS headers of the spectra. 27- 32 F6.3 mag r'mag r'-band PSF magnitude corrected for Galactic extinction 34- 39 F6.3 mag i'mag i'-band PSF magnitude corrected for Galactic extinction 41- 46 F6.3 mag z'mag z'-band PSF magnitude corrected for Galactic extinction 48- 53 F6.3 --- Sp+Index Spectral index. 55- 59 F5.3 --- e_Sp+Index 1-sigma statistical error in spectral index 61- 65 F5.2 --- S/Nmin Minimum signal-to-noise ratio 67- 72 F6.4 ---- zabs ?=0.0000 Absorption redshift of the DLA (approximate only) 74- 79 F6.3 0.1nm EWHa ?=0.000 Rest-frame equivalent width of the damped Lyman alpha line 82- 86 F5.3 0.1nm e_EWHa ?=0.000 1-sigma statistical error in EWHa 88 I1 --- DLA [0/2] Status of DLA detection (1) 91 I1 --- Target [0/1] Primary (1) or secondary (0) SDSS target 94 I1 --- DR1 [0/1] QSO appears (1) or did not appears (0) in SDSS DR1 QSO catalogue (Cat. J/AJ/126/2579) 97 I1 --- BAL [0/1] QSO deemed (1) or not deemed (0) to have BALs (2)
Note (1): Damped Lymanα (DLA) detection flags as follows: 0 = indicates no DLA detected 1 = indicates that the DLA detection is plausible, though unconvincing and so is excluded from further analysis (i.e. this sight-line appears in neither the DLA or control samples) 2 = indicates that the DLA detection is taken to be genuine Note (2): Flag indicating whether the QSO was judged, by visual inspection, to have some moderately strong Broad Absorption Lines (BALs) in its spectrum.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 29-Apr-2005
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