XMM observations of the high-redshift quasar RX J1028.6 - 0844 at z = 4.276: Soft X-ray spectral flattening | |
Yuan WM(袁为民)3,4; Fabian, A. C.3; Celotti, A.2; McMahon, R. G.3; Matsuoka, M.1 | |
刊名 | Monthly Notices of the Royal Astronomical Society |
2005-04-01 | |
卷号 | 358期号:2页码:432-440 |
关键词 | galaxies: active galaxies: individual: RXJ1028.6-0844 X rays: galaxies |
ISSN号 | 0035-8711 |
DOI | 10.1111/j.1365-2966.2005.08800.x |
产权排序 | 第4完成单位 |
文献子类 | Article |
英文摘要 | We present results from a new XMM-Newton observation of the high-redshift quasar RXJ1028.6 - 0844 at a redshift of 4.276. The soft X-ray spectral flattening, as reported by a previous study with ASCA, is confirmed to be present, with, however, a reduced column density when modelled by absorption. The inferred column density for absorption intrinsic to the quasar is 2.1( +0.4-0.3) × 1022 cm-2 for cold matter, and higher for ionized gas. The spectral flattening shows remarkable similarity with that of two similar object, namely GB 1428 + 4217 and PMN J0525 - 3343. The results improve upon those obtained from a previous short-exposure observation for RX J1028.6 - 0844 with XMM-Newton. A comparative study of the two XMM-Newton observations reveals a change in the power-law photon index from γ 1.3 to 1.5 on time-scales of about one year. A tentative excess emission feature in the rest-frame 5-10 keV band is suggested, which is similar to that marginally suggested for GB 1428 + 4217. © 2005 RAS. |
学科主题 | 天文学 |
URL标识 | 查看原文 |
出版地 | GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND |
资助项目 | N/A |
WOS关键词 | RADIO-LOUD QUASAR ; SBLAZAR GB 1428+4217 ; NEWTON OBSERVATIONS ; RX J1028.6-0844 ; WGACAT QUASARS ; EARLY UNIVERSE ; WARM ABSORBER ; Z=4.72 ; ABSORPTION ; ASCA |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | Oxford University Press |
WOS记录号 | WOS:000227673700010 |
资助机构 | N/A |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/25085] |
专题 | 云南天文台_高能天体物理研究组 |
通讯作者 | Yuan WM(袁为民) |
作者单位 | 1.Japan Aerospace Exploration Agency, Tsukuba Space Centre, Tsukuba, Ibaraki 305-8505, Japan; 2.SISSA, via Beirut 2-4, 34014 Trieste, Italy; 3.University of Cambridge, Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, United Kingdom; 4.Yunnan Astronomical Observatory, Chinese Academy of Sciences, Phoenix Hill, Kunming, Yunnan, 650011, China |
推荐引用方式 GB/T 7714 | Yuan WM,Fabian, A. C.,Celotti, A.,et al. XMM observations of the high-redshift quasar RX J1028.6 - 0844 at z = 4.276: Soft X-ray spectral flattening[J]. Monthly Notices of the Royal Astronomical Society,2005,358(2):432-440. |
APA | Yuan WM,Fabian, A. C.,Celotti, A.,McMahon, R. G.,&Matsuoka, M..(2005).XMM observations of the high-redshift quasar RX J1028.6 - 0844 at z = 4.276: Soft X-ray spectral flattening.Monthly Notices of the Royal Astronomical Society,358(2),432-440. |
MLA | Yuan WM,et al."XMM observations of the high-redshift quasar RX J1028.6 - 0844 at z = 4.276: Soft X-ray spectral flattening".Monthly Notices of the Royal Astronomical Society 358.2(2005):432-440. |
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