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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 PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
EISSN1365-2966
Volume459Issue:1Pages:L100-L104
SubtypeArticle
AbstractThe 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.
Keywordgalaxies: individual: Circinus, Mrk 3, NGC 1068, NGC 3393, NGC 7582, NGC 2992, NGC 4388, NGC 4507, 3C 445 galaxies: Seyfert X-rays: galaxies
DOI10.1093/mnrasl/slw042
Indexed BySCI ; ADS
Language英语
WOS IDWOS:000376388000021
ADS Bibcode2016MNRAS.459L.100L
ADS URLhttps://ui.adsabs.harvard.edu/abs/2016MNRAS.459L.100L
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2016MNRAS.459L.100L/citations
inspireid1427268
Citation statistics
Cited Times:5 [INSPIRE]
Cited Times:6 [ADS]
Document Type期刊论文
Identifierhttp://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.
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