| Clumpy tori around type II active galactic nuclei as revealed by X-ray fluorescent lines | |
Liu, JR; Liu Y(刘元) ; Li XB(李小波); Liu, Y; Li, XB; Xu, WW; Gou, LJ; Cheng, C
| |
| 2016 | |
| Source Publication | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| ISSN | 0035-8711 |
| EISSN | 1365-2966 |
| Volume | 459Issue:1Pages:L100-L104 |
| Subtype | Article |
| Abstract | The reflection spectrum of a torus around an active galactic nucleus (AGN) is characterized by X-ray fluorescent lines, which are most prominent for type II AGNs. A clumpy torus allows photons reflected from the back-side of the torus to leak through the front regions that are free of obscuration. The observed X-ray fluorescent lines are therefore sensitive to the clumpiness of the torus. We analysed a sample of type II AGNs observed with the Chandra High Energy Transmission Grating Spectrometer (HETGS), and measured the fluxes for the Si K alpha and Fe K alpha lines. The measured FeK alpha/Si K alpha ratios, spanning a range between 5 and 60, are far smaller than the ratios predicted from simulations of smooth tori, indicating that the tori of the studied sources have clumpy distributions rather than smooth ones. We compared the measured Fe K alpha/Si K alpha ratios with simulation results of clumpy tori. The Circinus galaxy has a FeK alpha/Si K alpha ratio of similar to 60, which is close to the simulation results for N = 5, where N is the average number of clumps along the line of sight. The FeK alpha/Si K alpha ratios of the other sources are all below the simulation results for N = 2. Overall, this shows that the non-Fe fluorescent lines in the soft X-ray band are a potentially powerful probe of the clumpiness of tori around AGNs. |
| Keyword | galaxies: individual: Circinus, Mrk 3, NGC 1068, NGC 3393, NGC 7582, NGC 2992, NGC 4388, NGC 4507, 3C 445 galaxies: Seyfert X-rays: galaxies |
| DOI | 10.1093/mnrasl/slw042 |
| Indexed By | SCI ; ADS |
| Language | 英语 |
| WOS ID | WOS:000376388000021 |
| ADS Bibcode | 2016MNRAS.459L.100L |
| ADS URL | https://ui.adsabs.harvard.edu/abs/2016MNRAS.459L.100L |
| ADS CITATIONS | https://ui.adsabs.harvard.edu/abs/2016MNRAS.459L.100L/citations |
| inspireid | 1427268 |
| Citation statistics |
Cited Times:5 [INSPIRE]
Cited Times:6 [ADS]
|
| Document Type | 期刊论文 |
| Identifier | http://ir.ihep.ac.cn/handle/311005/247964 |
| Collection | 粒子天体物理中心 |
| Recommended Citation GB/T 7714 | Liu, JR,Liu Y,Li XB,et al. Clumpy tori around type II active galactic nuclei as revealed by X-ray fluorescent lines[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,459(1):L100-L104. |
| APA | Liu, JR.,刘元.,李小波.,Liu, Y.,Li, XB.,...&Cheng, C.(2016).Clumpy tori around type II active galactic nuclei as revealed by X-ray fluorescent lines.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,459(1),L100-L104. |
| MLA | Liu, JR,et al."Clumpy tori around type II active galactic nuclei as revealed by X-ray fluorescent lines".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 459.1(2016):L100-L104. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment