PKS 0483-436 - A high-redshift quasar with strong X-ray absorption
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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.
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.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:30212194
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