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AN X-RAY SPECTRAL MODEL FOR CLUMPY TORI IN ACTIVE GALACTIC NUCLEI
Liu Y(刘元); 李小波;Liu, Y; Li, XB
2014
发表期刊ASTROPHYSICAL JOURNAL
卷号787期号:1页码:52
摘要We construct an X-ray spectral model for the clumpy torus in an active galactic nucleus (AGN) using Geant4, which includes the physical processes of the photoelectric effect, Compton scattering, Rayleigh scattering, gamma conversion, fluorescence line, and Auger process. Since the electrons in the torus are expected to be bounded instead of free, the deviation of the scattering cross section from the Klein-Nishina cross section has also been included, which changes the X-ray spectra by up to 25% below 10 keV. We have investigated the effect of the clumpiness parameters on the reflection spectra and the strength of the fluorescent line Fe K alpha. The volume filling factor of the clouds in the clumpy torus only slightly influences the reflection spectra, however, the total column density and the number of clouds along the line of sight significantly change the shapes and amplitudes of the reflection spectra. The effect of column density is similar to the case of a smooth torus, while a small number of clouds along the line of sight will smooth out the anisotropy of the reflection spectra and the fluorescent line Fe K alpha. The smoothing effect is mild in the low column density case (N-H = 10(23) cm(-2)), whereas it is much more evident in the high column density case (N-H = 10(25) cm(-2)). Our model provides a quantitative tool for the spectral analysis of the clumpy torus. We suggest that the joint fits of the broad band spectral energy distributions of AGNs (from X-ray to infrared) should better constrain the structure of the torus.
关键词galaxies: Seyfert radiative transfer X-rays: galaxies
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/787/1/52
收录类别SCI
WOS记录号WOS:000335924200052
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被引频次:24[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224845
专题粒子天体物理中心
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Liu Y,李小波;Liu, Y,Li, XB. AN X-RAY SPECTRAL MODEL FOR CLUMPY TORI IN ACTIVE GALACTIC NUCLEI[J]. ASTROPHYSICAL JOURNAL,2014,787(1):52.
APA 刘元,李小波;Liu, Y,&Li, XB.(2014).AN X-RAY SPECTRAL MODEL FOR CLUMPY TORI IN ACTIVE GALACTIC NUCLEI.ASTROPHYSICAL JOURNAL,787(1),52.
MLA 刘元,et al."AN X-RAY SPECTRAL MODEL FOR CLUMPY TORI IN ACTIVE GALACTIC NUCLEI".ASTROPHYSICAL JOURNAL 787.1(2014):52.
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