J/A+A/607/A107ivo://CDS.VizieR/J/A+A/607/A107doi:10.26093/cds/vizier.36070107CDSWiseman P.Perley D. A.Schady P.Prochaska J. X.de Ugarte Postigo A.,Kruehler T.Yates R. M.Greiner J2017-12-13T18:26:29Z2017-11-22T06:18:25ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyspectroscopyWe reveal multiple components of an interacting galaxy system at z~3.35 through a detailed analysis of the exquisite high-resolution Keck/HIRES spectrum of the afterglow of a gamma-ray burst (GRB). Through Voigt-profile fitting of absorption lines from the Lyman-series, we constrain the neutral hydrogen column density to N_HI_<=10^18.35^cm^-2^ for the densest of four distinct systems at the host redshift of GRB 080810, among the lowest NHI ever observed in a GRB host, despite the line of sight passing within a projected 5kpc of the galaxy centres. By detailed analysis of the corresponding metal absorption lines, we derive chemical, ionic and kinematic properties of the individual absorbing systems, and thus build a picture of the host as a whole. Striking differences between the systems imply that the line of sight passes through several phases of gas: the star-forming regions of the GRB host; enriched material in the form of a galactic outflow; the hot and ionised halo of a second, interacting galaxy falling towards the host at a line-of-sight velocity of 700km/s; and a cool, metal-poor cloud which may represent one of the best candidates yet for the inflow of metal-poor gas from the intergalactic medium.2017A&A...607A.107Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/607/A107CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/607/A107https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/607/A107http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/607/A107https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/607/A107https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/607/A107http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/607/A107GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/607/A107/list (Information on spectrum file)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/607/A107/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/607/A107/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/607/A107/list?GETtext/xml+votable180.050000true356.79366670.31980560.0055555555555555566/18777https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/607/A107?format=asciiGamma-rayOpticaldefaultJ/A+A/607/A107/listInformation on spectrum fileNameNamemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainNxNumber of pointsmeta.numberintblambdaLower value of wavelength interval0.1nmem.wldoubleBlambdaUpper value of wavelength interval0.1nmem.wldoublespShow the spectrummeta.ref.urlcharFileNameName of the spectrum filemeta.id;meta.filecharTitleTitle of the filemeta.title;meta.filechar