X-ray fluorescent lines from the Compton-thick AGN in M51
文献类型：期刊论文
| 作者 | Xu, Weiwei ; Liu, Zhu; Gou, Lijun; Liu, Jiren
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2016 |
| 卷号 | 455期号:1页码:L26-L30 |
| 关键词 | atomic processes galaxies: individual: M51 (NGC 5194) galaxies: Seyfert X-rays: galaxies |
| 英文摘要 | The cold disc/torus gas surrounding active galactic nuclei (AGN) emits fluorescent lines when irradiated by hard X-ray photons. The fluorescent lines of elements other than Fe and Ni are rarely detected due to their relative faintness. We report the detection of K alpha lines of neutral Si, S, Ar, Ca, Cr, and Mn, along with the prominent Fe Ka, Fe K beta, and Ni K alpha lines, from the deep Chandra observation of the low-luminosity Compton-thick AGN in M51. The Si Ka line at 1.74 keV is detected at similar to 3 sigma, the other fluorescent lines have a significance between 2 and 2.5 sigma, while the Cr line has a significance of similar to 1.5 sigma. These faint fluorescent lines are made observable due to the heavy obscuration of the intrinsic spectrum of M51, which is revealed by NuSTAR observation above 10 keV. The hard X-ray continuum of M51 from Chandra and NuSTAR can be fitted with a power-law spectrum with an index of 1.8, reprocessed by a torus with an equatorial column density of N-H similar to 7 x 10(24) cm(-2) and an inclination angle of 74 degrees. This confirms the Compton-thick nature of the nucleus of M51. The relative element abundances inferred from the fluxes of the fluorescent lines are similar to their solar values, except for Mn, which is about 10 times overabundant. It indicates that Mn is likely enhanced by the nuclear spallation of Fe. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000368005900006 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5467]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Weiwei,Liu, Zhu,Gou, Lijun,et al. X-ray fluorescent lines from the Compton-thick AGN in M51[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,455(1):L26-L30. |
| APA | Xu, Weiwei,Liu, Zhu,Gou, Lijun,&Liu, Jiren.(2016).X-ray fluorescent lines from the Compton-thick AGN in M51.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,455(1),L26-L30. |
| MLA | Xu, Weiwei,et al."X-ray fluorescent lines from the Compton-thick AGN in M51".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 455.1(2016):L26-L30. |
入库方式： OAI收割
来源：国家天文台
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