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dc.contributor.authorWilkes, Belinda Jane
dc.contributor.authorElvis, Martin S.
dc.contributor.authorFiore, Fabrizio
dc.contributor.authorMcDowell, Jonathan Christopher
dc.contributor.authorTananbaum, Harvey D.
dc.contributor.authorLawrence, Andrew
dc.date.accessioned2017-02-13T16:56:48Z
dc.date.issued1992
dc.identifier.citationWilkes, Belinda J., Martin Elvis, Fabrizio Fiore, Jonathan C. McDowell, Harvey Tananbaum, and Andrew Lawrence. 1992. “PKS 0483-436 - A High-Redshift Quasar with Strong X-Ray Absorption.” The Astrophysical Journal 393 (July): L1. doi:10.1086/186436.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:30212194
dc.description.abstractThe first X-ray spectrum of a high-redshift (z = 2.85) quasar is reported. The Rosat PSPC spectrum of PKS 0438-436, covering 0.3-9 keV in the quasar's rest frame, reveals unexpected absorption of about 1 x 10 exp 22/sq cm, assuming it occurs at the source. Only one other high-luminosity quasar (of greater than about 50 observed by Einstein) shows significant absorption in its X-ray spectrum. Of the common line-of-sight absorbers, only highly ionized Ly-alpha forest clouds may be able to explain this amount of absorption. Candidates for an intrinsic absorber are discussed. Absorption at about 1 keV (rest frame) is due primarily to heavy elements. (O, Ne, Mg, Si, S) raising the possibility of measuring early universe abundances via X-ray absorption in this and like quasars. PKS 0438-436 may be a high-redshift member of a population of quasars which can contribute to the X-ray background above 2 keV, without being detectable by previous imaging missions.en_US
dc.description.sponsorshipAstronomyen_US
dc.language.isoen_USen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofdoi:10.1086/186436en_US
dash.licenseLAA
dc.subjectQuasarsen_US
dc.subjectRed Shiften_US
dc.subjectX Ray Absorptionen_US
dc.subjectAbsorption Spectraen_US
dc.subjectLyman Alpha Radiationen_US
dc.subjectRosat Missionen_US
dc.subjectX Ray Spectraen_US
dc.titlePKS 0483-436 - A high-redshift quasar with strong X-ray absorptionen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalThe Astrophysical Journalen_US
dash.depositing.authorWilkes, Belinda Jane
dc.date.available2017-02-13T16:56:48Z
dc.identifier.doi10.1086/186436*
dash.contributor.affiliatedMcDowell, Jonathan
dash.contributor.affiliatedElvis, Martin
dash.contributor.affiliatedTananbaum, Harvey
dash.contributor.affiliatedWilkes, Belinda


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