Origin of X-rays in the low state of the FSRQ 3C 273: evidence of inverse Compton emission
文献类型：期刊论文
| 作者 | Kalita, Nibedita1,2; Gupta, Alok C.2,5; Wiita, Paul J.4; Dewangan, Gulab C.3; Duorah, Kalpana1 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2017-08-01 |
| 卷号 | 469期号:4页码:3824-3839 |
| ISSN号 | 0035-8711 |
| 关键词 | Galaxies: Active Quasars: General Quasars: Individual: 3c 273 X-rays: Individual: 3c 273 |
| DOI | 10.1093/mnras/stx1108 |
| 英文摘要 | We analyse the 2.5-10 keV X-ray spectra of the luminous quasar 3C 273 and simultaneous observations in UV wavelengths from XMM-Newton between 2000 and 2015. The lowest flux level ever was observed in 2015. The continuum emission from 3C 273 is generally best described by an absorbed power-law but during extremely low states the addition of fluorescence from the K-shell iron line improves the fit. We study the spectral evolution of the source during its extended quiescent state and also examine connections between the X-ray and ultraviolet emissions, which have been seen in some, but not all, previous work. We detect a possible anticorrelation between these two bands during the low state that characterized 3C 273 for most of this period; however, this was not present during a flaring state. A harder-when-brighter trend for the X-ray spectrum was observed in these long-term observations of 3C 273 for the first time. We suggest that the X-ray emission in 3C 273 is the result of inverse Compton scattering of soft UV seed photons (emitted from the local environment of the AGN), most likely in a thermal corona. We can explain the significant temporal variation of the spectral continuum as an outcome of changing optical depth of the Comptonizing medium, along the lines of the wind-shock model proposed by Courvoisier and Camenzind. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000406837900005 |
| 源URL | [http://119.78.226.72/handle/331011/32547]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Kalita, Nibedita; Gupta, Alok C.; Wiita, Paul J. |
| 作者单位 | 1.Gauhati Univ, Dept Phys, Gauhati 781014, India 2.Aryabhatta Res Inst Observat Sci ARIES, Manora Peak 263002, Nainital, India 3.IUCAA, Post Bag 4, Pune 411007, Maharashtra, India 4.Coll New Jersey, Dept Phys, POB 7718, Ewing, NJ 08628 USA 5.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Kalita, Nibedita,Gupta, Alok C.,Wiita, Paul J.,et al. Origin of X-rays in the low state of the FSRQ 3C 273: evidence of inverse Compton emission[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,469(4):3824-3839. |
| APA | Kalita, Nibedita,Gupta, Alok C.,Wiita, Paul J.,Dewangan, Gulab C.,&Duorah, Kalpana.(2017).Origin of X-rays in the low state of the FSRQ 3C 273: evidence of inverse Compton emission.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,469(4),3824-3839. |
| MLA | Kalita, Nibedita,et al."Origin of X-rays in the low state of the FSRQ 3C 273: evidence of inverse Compton emission".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 469.4(2017):3824-3839. |
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来源：上海天文台
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