Proximate damped Ly{alpha} systems in SDSS-DR5 J/ApJ/675/1002 ivo://CDS.VizieR/J/ApJ/675/1002 doi:10.26093/cds/vizier.16751002 CDS Prochaska J.X. Hennawi J.F. Herbert-Fort S. 2017-09-19T14:24:11Z 2010-10-02T23:28:20Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr quasars redshifted Using the Sloan Digital Sky Survey Data Release 5 (SDSS-DR5), we survey proximate damped Ly{alpha} systems (PDLAs): absorption-line systems with HI column density N_H_>=2x10^20^cm^-2^ at velocity separation {delta}v<2999km/s from their background quasar. Many of these absorbers may be physically associated with their background quasars, and their statistics allow us to study quasar environments out to z~5. However, the large ionizing flux emitted by a quasar can ionize the neutral gas in a nearby galaxy, possibly giving rise to a "proximity effect", analogous to the similar effect observed in the Ly{alpha} forest. From a sample of 108 PDLAs, we measure the HI frequency distribution f(N_H_,X) incidence, and gas mass density of the PDLAs near luminous quasars over the redshift interval z=2.2-5. The incidence and mass density of PDLAs at z~3 is approximately twice that of intervening DLAs, while at z<2.5 and >3.5 the f(N_H_X) distribution is enhanced but statistically consistent with the intervening population. We interpret the observed enhancement of PDLAs around quasars in terms of quasar-galaxy clustering and compare the strength of the clustering signal to the expectation from independent measures of the respective clustering strengths of DLAs and quasars, as well as a complementary analysis of the clustering of absorbers around quasars in the transverse direction. We find that there are a factor of 5-10 fewer PDLAs around quasars than expected and interpret this result as evidence for the hypothesis that the ionizing flux from the quasars photoevaporates HI in nearby DLA galaxies, thus reducing their cross section for DLA absorption. This constitutes the first detection of a "proximity effect" for DLAs. 2008ApJ...675.1002P https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/675/1002 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/ApJ/651/61 : Optically thick absorbers near luminous quasars (Hennawi+ 2006) J/AJ/133/2222 : Clustering of high-redshift QSOs from SDSS (Shen+, 2007) http://www.sdss.org : SDSS Home Page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/675/1002 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/675/1002 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/675/1002 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/675/1002 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/675/1002 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/675/1002 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/675/1002/table1 (SDSS-DR5 quasar for proximate DLA) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/675/1002/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/675/1002/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/675/1002/table1? 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Should Not be used for identification. meta.record int Set meta.note char QSO Quasar name (JHHMMSS.s+DDMMSS.s) meta.id;meta.main char zabs Absorption redshift src.redshift float fmtl [0/2] Flag for metal absorption (1) meta.note int logNH Hydrogen column density log(cm**-2) phys.columnDensity float E_logNH Error on logNH (upper limit) log(cm**-2) stat.error;stat.max float e_logNH Error on logNH (lower limit) log(cm**-2) stat.error float SDSS Full SDSS name (added at CDS) meta.id char
J/ApJ/675/1002/table1 SDSS-DR5 quasar for proximate DLA SimbadName Simbad column added by the CDS meta.id char MJD Modified Julian Date of the observation d time.epoch int recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Plate SDSS Plate number meta.id;instr.plate int Fiber SDSS Fiber identification number meta.note int n_SDSS Simbad column added by the CDS meta.ref.url char SDSS SDSS source name, JHHMMSS.ss+DDMMSS.s meta.id;meta.main char primary zQSO Quasar redshift reported in SDSS-DR5 src.redshift;pos.heliocentric float znew ? New quasar redshift (1) src.redshift;pos.heliocentric float nullable fmtl [0/3]? Absorption flag (2) meta.note int nullable zinit ? Starting redshift for the PDLA search (3) src.redshift;pos.heliocentric float nullable Sloan Display the SDSS data for this quasar meta.ref.url char DR7 Details from SDSS-DR7 photometric catalog meta.ref.url char _RA Position, from SDSS name (right ascension part) deg pos.eq.ra;meta.main _DE Position, from SDSS name (declination part) deg pos.eq.dec;meta.main