An X-Ray Study of Lobe-Dominated Radio-Loud Quasars with XMM-Newton
文献类型：期刊论文
| 作者 | Dou LM(窦立明)1,2 ; Yuan WM(袁为民)1
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| 刊名 | CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2008 |
| 卷号 | 8期号:6页码:653-670 |
| 关键词 | galaxies: active quasars: general galaxies: X-ray galaxies: radio continuum |
| ISSN号 | 1009-9271 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Dou, LM (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 英文摘要 | We report on our results of X-ray spectral analysis for a sample of radio-loud quasars covering a wide range of the radio core-dominance Parameter, R, from core-dominated to lobe-dominated objects, using data obtained mostly with the XMM-Newton Observatory. We find that the spectral shape of the underlying power-law continuum is flat even for the lobe-dominated objects (average photon index similar to 1.5), indistinguishable from that of core-dominated quasars. For lobe-dominated objects, contribution of X-rays from the jets is expected to be very small based on previous unification schemes, more than one order of magnitude lower than the observed X-ray luminosities. Assuming that radio-loud quasars follow the same X-ray-UV/optical luminosity relation for the disk-corona. emission as found for radio-quiet quasars, we estimate the X-ray flux contributed by the disk-corona component from the optical/UV continuum. We find that neither the luminosity, nor the spectral shape, of the disk-corona X-ray emission can account for the bulk of the observed X-ray properties. Thus in lobe-dominated quasars, either the disk-corona X-ray emission is much enhanced in strength and flatter in spectral shape (photon index similar to 1.5) compared to normal radio-quiet quasars, or their jet X-ray emission is much enhanced compared to their weak radio core-jet emission. If the latter is the case, our result may imply that the jet emission in X-rays is less Doppler beamed than that in the radio. As a demonstrating example, we test this hypothesis by using a specific model in which the X-ray jet has a larger opening angle than the radio jet. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ACTIVE GALACTIC NUCLEI ; BL-LACERTAE OBJECTS ; BAND ENERGY-DISTRIBUTION ; ROSAT DETECTED QUASARS ; DIGITAL-SKY SURVEY ; CHANDRA DISCOVERY ; EXTRAGALACTIC SOURCES ; VLA OBSERVATIONS ; PG QUASARS ; HOT-SPOTS |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/1009-9271/8/6/04/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000262268400004 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4968]  |
| 专题 | 云南天文台_高能天体物理研究组 |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Graduate School of Chinese Academy of Sciences, Beijing 100049, China |
| 推荐引用方式 GB/T 7714 | Dou LM,Yuan WM. An X-Ray Study of Lobe-Dominated Radio-Loud Quasars with XMM-Newton[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2008,8(6):653-670. |
| APA | Dou LM,&Yuan WM.(2008).An X-Ray Study of Lobe-Dominated Radio-Loud Quasars with XMM-Newton.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,8(6),653-670. |
| MLA | Dou LM,et al."An X-Ray Study of Lobe-Dominated Radio-Loud Quasars with XMM-Newton".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 8.6(2008):653-670. |
入库方式： OAI收割
来源：云南天文台
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