X-Ray Study of the Distant QSO PKS 0237–233 with ASCA and ROSAT

Publications of the Astronomical Society of Japan

Miyazaki, Hiroyuki¹  Ohashi, Takaya¹  Yamasaki, Noriko Y.¹  Wilkes, Belinda J.² 

[1] Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397 E-mail(NYY):;Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA

关键词: "intergalactic medium";    Quasars;    "X-rays: sources";   

DOI  :  10.1093/pasj/50.1.19

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

TheX-rayspectrumofthedistantQSOPKS0237–233(z=2.223)hasbeenstudiedwithASCAandROSAT.Thespectrumintheenergyrange0.1keVto8keVintheobserver'sframeiswellfittedbyapower-lawmodelwithaphotonindexof1.54±0.06absorbedbythegalacticinterstellarmatter.Thelackofexcessabsorptionconfirmsthatsuchabsorptionisnotauniversalpropertyofthehigh-redshiftGHz-peakedspectrum(GPS)sources.FromacomparisonoftheLymanalphaandthemetalabsorptionlinesintheopticalandUVbands,smallamountofX-rayabsorptionconstrainstheionizationstateofthemetallinesystematz=1.65as[HI/H]gt;2.5×10−4and[CIV/C]gt;0.11ifthemetallinesystemshaveametalabundanceof0.1Z⊙.

【 授权许可】

Unknown