J/ApJ/718/392ivo://CDS.VizieR/J/ApJ/718/392doi:10.26093/cds/vizier.17180392CDSProchaska J.X.O'Meara J.M.Worseck G.2017-12-22T05:33:20Z2012-07-27T08:57:20ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frredshiftedquasarsspectroscopyWe perform a semi-automated survey for {tau}_912_>=2 Lyman limit systems (LLSs) in quasar spectra from the Sloan Digital Sky Survey, Data Release 7. From a starting sample of 2473 quasars with z_em_=3.6-5.0, we analyze 429 spectra meeting strict selection criteria for a total redshift path {Delta}z=93.8 and identify 190 intervening systems at z_LLS_>=3.3. We also perform a survey for proximate LLSs (PLLSs) and find that {l}_PLLS_(z) is systematically lower (~25%) than intervening systems.2010ApJ...718..392Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/718/392CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/ApJ/736/42 : HST QSO Catalog (Ribaudo+, 2011)J/ApJS/195/16 : HST survey for Lyman limit systems. I. (O'Meara+, 2011)J/ApJ/648/L97 : 2 SDSS QSOs supersolar super-Lyman limit systems (Prochaska+http://www.ucolick.org/~xavier/SDSSLLS/ : SDSS LLS survey home pagehttp://www.sdss.org/ : SDSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/718/392https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/718/392http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/718/392https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/718/392https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/718/392http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/718/392GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/718/392/table1 (SDSS-DR7 quasar sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/718/392/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/718/392/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/718/392/table1?GETtext/xml+votable180.050000true0.6600417-10.19716670.0055555555555555565/1058 1108 1141 1142 1154 1160 1228 1265 1311 1357 1390 1600 1606 1661 2114 2273 2287 2304 2308 2483 2574 2637 2660 2734 2765 2790 2873 6624 6631 6866 6957 6959 6991 7060 7113 6/0 554 640 4096 4097 4101 4104 4106 4110 4111 4114 4118 4119 4130 4133 4134 4138 4139 4143 4144 4149 4154 4158 4159 4160 4163 4168 4169 4170 4172 4174 4175 4176 4177 4182 4183 4184 4186 4187 4188 4191 4192 4196 4197 4202 4203 4207 4209 4213 4214 4215 4216 4219 4224 4225 4227 4228 4230 4241 4242 4245 4247 4250 4252 4259 4260 4263 4267 4268 4270 4275 4286 4288 4289 4290 4296 4301 4305 4307 4311 4312 4314 4326 4328 4333 4338 4340 4343 4344 4346 4347 4348 4350 4352 4355 4356 4359 4360 4368 4369 4374 4376 4377 4380 4382 4384 4386 4388 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Should Not be used for identification.meta.recordintPlatePlate numbermeta.id;instr.plateintMJDModified Julian Date of observationdtime.epochintFiberFiber identificationmeta.id;meta.mainintSDSSObject name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharprimaryMSimbad column added by the CDSmeta.ref.urlcharzEmission line derived redshift (1)src.redshiftfloatf_zFlag on z (0=normal) (2)meta.codeintA? Absorbed continuum fitting parameter A (3)stat.param;spect.continuumfloatnullableB? Absorbed continuum fitting parameter B (3)stat.param;spect.continuumfloatnullableScale? Additional scaling factor (4)arith.factorfloatnullableS/N? Estimated signal-to-noise (5)stat.snrfloatnullablef_S/N[I] I: indicates an infinity value for S/Nmeta.codecharDR7Display the SDSS-DR7 quasar and photometry catalogs within 1.5"meta.ref.urlcharSloanDisplay the SDSS online data for this quasarmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refcharNEDSimbad column added by the CDSmeta.refchar_RAPositions from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS name (declination part)degpos.eq.dec;meta.mainJ/ApJ/718/392/table2SDSS-DR7 intervening {tau}_912_>=2 LLS surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRangeThe z_em_ range (< 3.6 or >=3.6) (1)meta.codecharSDSSQuasar name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharzEmission line derived redshiftsrc.redshiftfloatzS/N2Starting redshift at S/N=2 (2)src.redshiftfloatzS/N3? Starting redshift at S/N=3 (2)src.redshiftfloatnullablezLLS? Lyman Limit System redshiftsrc.redshiftfloatnullableJ/ApJ/718/392/table3SDSS-DR7 non-statistical LLS systems and candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSQuasar name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharzEmission line derived redshiftsrc.redshiftfloatzLLSLyman Limit System redshiftsrc.redshiftfloatlogNHILog of HI column density (1)log(cm**-2)phys.columnDensityfloatS/NSignal-to-noise (2)stat.snrcharJ/ApJ/718/392/table6SDSS-DR7 proximate {tau}_912_>=2 LLS surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSQuasar namemeta.id;meta.maincharzEmission line derived redshiftsrc.redshiftfloatzLLS? Lyman Limit System redshiftsrc.redshiftfloatnullableJ/ApJ/718/392/table8SDSS-DR7 quasars with KECK+LRIS comparison spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharzEmission line redshiftsrc.redshiftfloatS/NSignal to noise of the absorbed continuum at the Lyman limit (S/N^A^_912_)stat.snr;spect.continuumfloatf_SDSS[1/3] Flag indication (1=no LLS, 2={tau}_912_>=2LLS, 3={tau}_912_<2LLS) (1)meta.codeintSLLS? SDSS LLS modeling resultsrc.redshiftfloatnullableSpLLS? SDSS proximate LLS modeling resultsrc.redshiftfloatnullableLLLS? LRIS LLS modeling resultsrc.redshiftfloatnullableLpLLS? LRIS proximate LLS modeling resultsrc.redshiftfloatnullable