J/MNRAS/391/1457ivo://CDS.VizieR/J/MNRAS/391/1457doi:10.26093/cds/vizier.73911457CDSKirkman D.Tytler D.2024-07-07T20:17:23Z2009-06-28T07:41:41ZCDS support team

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

cds-question@unistra.frquasarsredshiftedapparent-magnitudeh-i-line-emissionWe look for signs of the HI transverse proximity effect in the spectra of 130 quasi-stellar object (QSO) pairs, most with transverse separations in the plane of the sky of 0.1-3Mpc at z~2.2. We expected to see a decrease in Ly{alpha} forest HI absorption in the spectrum of background QSOs near the position of foreground QSOs. Instead, we see no change in the absorption in front of the foreground QSOs, and we see evidence for a 50 per cent increase in the absorption out to 6Mpc behind the foreground QSOs. Further, we see no change in the HI absorption along the line-of-sight to the foreground QSOs, the normal line-of-sight proximity effect. We may account for the lack of change in the HI absorption if the effect of extra ultraviolet photons is cancelled by higher gas density around QSOs. If so, the increase in absorption behind the QSOs then suggests that the higher gas density there is not cancelled by the UV radiation from the QSOs. We can explain our observations if QSOs have had their current UV luminosities for less than approximately a million years, a time-scale that has been suggested for accretion disc instabilities and gas depletion.2008MNRAS.391.1457Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/391/1457CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/276 : SDSS Photometric Catalog, Release 5 (Adelman-McCarthy+, 2007)J/ApJ/658/99 : Pairs of QSO in SDSS-DR4 (Myers+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/391/1457https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/391/1457http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/391/1457https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/391/1457https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/391/1457http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/391/1457GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/391/1457/table1 (*QSO pairs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/391/1457/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/391/1457/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/391/1457/table1?GETtext/xml+votable180.050000true169.04458341.3040280.0055555555555555566/4099 4238 4836 4920 4952 4987 5055 5231 5439 5494 5638 5676 5714 5754 5882 5942 6043 6060 6068 6081 6117 6236 6425 6472 6487 6552 6643 7185 7427 8192 8638 8830 9256 9272 9325 9343 9419 9978 9980 10096 10194 10202 10383 10601 10707 10947 11317 11332 11348 11389 11400 11451 11465 11483 11504 11789 11844 11848-11849 12381 16494 16556 16586 16904 17295 17407 17492 17581 17584 17832 18032 18112 18535 18791 19101 22003 23072 23191 25943 25953 25957 25960 25982 26020 26023 26025 26178 26202 26205 26273 26277 26368 26373 26379 26969 26976 27025 27031 27046 27074 27104 27199 27305 27658 27770 27845 27880 28195 30033 32497 32680 32682 35551 35580 35735 35768 35897 35937 35939 35945 35999 36010 36265 46649 46651 46930 46953 47018 47041https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/391/1457?format=asciiOpticalRadiodefaultJ/MNRAS/391/1457/table1*QSO pairsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Background QSO right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Background QSO declination (J2000)pos.eq.dec;meta.mainzemBackground QSO emission redshiftsrc.redshiftfloatmagBackground QSO magnitude in bandmagphot.magfloatn_mag[V bJ rg] Background QSO photometric band of the magnitudeinstr.bandpasscharSBackground QSO signal-to-noise per {AA} at 1290{AA} in the QSO rest framestat.snrintRA2Second QSO right ascension (J2000)pos.eq.raDE2Second QSO declination (J2000)pos.eq.deczem2Second QSO emission redshiftsrc.redshiftfloatmag2Second QSO magnitude in bandmagphot.magfloatn_mag2[V bJ g] Second QSO photometric band of the magnitudeinstr.bandpasscharS2Second QSO signal-to-noise per {AA} at 1290{AA} in the QSO rest framestat.snrintSepAngular separation on the sky between the two QSOsarcsecpos.angDistance;obs.fieldfloatbImpact parameter in proper Mpc between the two sightlines at the zem of the foreground QSOMpcsrc.impactParamfloatLLyaEstimated Lyman alpha limit luminosity1e+23W.Hz**-1phys.luminosity;em.line.Lyalpha;spect.linefloatOmeMaxExpected ratio of the UV flux (1)phot.flux;arith.ratiofloat