AN X-RAY SPECTRAL MODEL FOR CLUMPY TORI IN ACTIVE GALACTIC NUCLEI

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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
刊名	ASTROPHYSICAL JOURNAL
	2014
卷号	787 期号:1 页码:52
关键词	galaxies: Seyfert radiative transfer X-rays: galaxies
英文摘要	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.
学科主题	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000335924200052
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224845]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	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.