X-ray emission from hot accretion flows
X-ray emission from hot accretion flows
复制标题
热吸积流的 X 射线发射
DOI：
10.1017/s1743921314004037
复制
发表时间：
2013-10
期刊：
影响因子：
--
通讯作者：
Stepnik Agnieszka
中科院分区：
文献类型：
--
作者：
Andrzej Niedzwiecki;Fu-Guo Xie;Stepnik Agnieszka
Abstract Radiatively inefficient, hot accretion flows are widely considered as a relevant accretion mode in low-luminosity AGNs. We study spectral formation in such flows using a refined model with a fully general relativistic description of both the radiative (leptonic and hadronic) and hydrodynamic processes, as well as with an exact treatment of global Comptonization. We find that the X-ray spectral index–Eddington ratio anticorrelation as well as the cut-off energy measured in the best-studied objects favor accretion flows with rather strong magnetic field and with a weak direct heating of electrons. Furthermore, they require a much stronger source of seed photons than considered in previous studies. The nonthermal synchrotron radiation of relativistic electrons seems to be the most likely process capable of providing a sufficient flux of seed photons. Hadronic processes, which should occur due to basic properties of hot flows, provide an attractive explanation for the origin of such electrons.
登录
查看更多内容
热吸积流内部区域整体康普顿冷却的蒙特卡洛模拟
DOI：
10.1111/j.1365-2966.2009.16135.x
发表时间：
2009-09
影响因子：
4.8
作者：
Niedzwiecki, Andrzej;Yuan, Feng;Zdziarski, Andrzej A.;Xie, Fu-Guo
通讯作者：
Xie, Fu-Guo
DOI：
10.1111/j.1365-2966.2009.15277.x
发表时间：
2009-06
影响因子：
4.8
作者：
M. Gu;Xinwu Cao
通讯作者：
M. Gu;Xinwu Cao
DOI：
10.1111/j.1365-2966.2011.20106.x
发表时间：
2011-07
影响因子：
4.8
作者：
A. Niedźwiecki;F. Xie;F. Xie;A. Zdziarski
通讯作者：
A. Niedźwiecki;F. Xie;F. Xie;A. Zdziarski
DOI：
10.1088/0004-637x/691/1/131
发表时间：
2008-09
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Y. Yang;Y. Yang;A. Wilson;G. Matt;Y. Terashima;Lj Greenhill
通讯作者：
Y. Yang;Y. Yang;A. Wilson;G. Matt;Y. Terashima;Lj Greenhill
影响因子：
2.3
作者：
S. Yamada;T. Itoh;K. Makishima;K. Nakazawa
通讯作者：
S. Yamada;T. Itoh;K. Makishima;K. Nakazawa