Color excess of SDSS quasars with DLA systems (Vladilo+, 2008)

Details Color excess of SDSS quasars with DLA systems (Vladilo+, 2008) Color excess of SDSS quasars with DLA systems (Vladilo+, 2008)

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat..34780701v&link_type=abstract

VizieR On-line Data Catalog: J/A+A/478/701. Originally published in: 2008A&A...478..701V

Physics

Qsos, Redshifts, Photometry

Scientific paper

We analyzed the spectroscopic and photometric database of the 5th data release of the Sloan Digital Sky Survey (SDSS) to search for evidence of the quasar reddening produced by dust embedded in intervening damped Ly{alpha} (DLA) systems. From a list of 5164 quasars in the interval of emission redshift 2.25<=ze<=3.5 and SDSS spectra with signal-to-noise ratio SNR>~4, we built up an "absorption sample" of 248 QSOs with a single DLA system in the interval of absorption redshift 2.2a<=3.5 and a "pool" of 1959 control QSOs without DLA systems or strong metal systems. For each QSO of the absorption sample we extracted from the pool a subset of control QSOs that are closest in redshift and magnitude.
(2 data files).

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