A luminous hot accretion flow in the low-luminosity active galactic nucleus NGC 7213
文献类型：期刊论文
| 作者 | Xie, Fu-Guo3; Zdziarski, Andrzej A.1; Ma, Renyi2,4; Yang, Qi-Xiang3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2016-12-01 |
| 卷号 | 463期号:3页码:2287-2295 |
| ISSN号 | 0035-8711 |
| 关键词 | Accretion, Accretion Discs Galaxies: Active Galaxies: Individual: Ngc 7213 Galaxies: Seyfert |
| DOI | 10.1093/mnras/stw2132 |
| 英文摘要 | The active galactic nucleus (AGN) NGC 7213 shows a complex correlation between the monochromatic radio luminosity L-R and the 2-10 keV X-ray luminosity L-X, i.e. the correlation is unusually weak with p similar to 0 (in the form L-R proportional to L-X(p)) when L-X is below a critical luminosity, and steep with p > 1 when L-X is above that luminosity. Such a hybrid correlation in individual AGNs is unexpected as it deviates from the Fundamental Plane of AGN activity. Interestingly, a similar correlation pattern is observed in the black hole X-ray binary H1743-322, where it has been modelled by switching between different modes of accretion. We propose that the flat L-R-L-X correlation of NGC 7213 is due to the presence of a luminous hot accretion flow, an accretion model whose radiative efficiency is sensitive to the accretion rate. Given the low luminosity of the source, L-X similar to 10(-4) of the Eddington luminosity, the viscosity parameter is determined to be small, alpha approximate to 0.01. We also modelled the broad-band spectrum from radio to gamma-rays, the time lag between the radio and X-ray light curves, and the implied size and the Lorentz factor of the radio jet. We predict that NGC 7213 will enter into a two-phase accretion regime when L-X greater than or similar to 1.5 x 10(42) erg s(-1). When this happens, we predict a softening of the X-ray spectrum with the increasing flux and a steep radio/X-ray correlation. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000393566000002 |
| 源URL | [http://119.78.226.72/handle/331011/32653]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Xie, Fu-Guo; Zdziarski, Andrzej A. |
| 作者单位 | 1.Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland 2.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 4.Xiamen Univ, Dept Astron, Xiamen 361005, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xie, Fu-Guo,Zdziarski, Andrzej A.,Ma, Renyi,et al. A luminous hot accretion flow in the low-luminosity active galactic nucleus NGC 7213[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,463(3):2287-2295. |
| APA | Xie, Fu-Guo,Zdziarski, Andrzej A.,Ma, Renyi,&Yang, Qi-Xiang.(2016).A luminous hot accretion flow in the low-luminosity active galactic nucleus NGC 7213.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,463(3),2287-2295. |
| MLA | Xie, Fu-Guo,et al."A luminous hot accretion flow in the low-luminosity active galactic nucleus NGC 7213".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 463.3(2016):2287-2295. |
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来源：上海天文台
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