期刊
ASTROPHYSICAL JOURNAL
卷 621, 期 2, 页码 785-792出版社
IOP PUBLISHING LTD
DOI: 10.1086/427741
关键词
accretion, accretion disks; Galaxy : center; X-rays : individual (Sagittarius A*)
We calculate synchrotron radiation in three-dimensional pseudo-Newtonian magnetohydrodynamic simulations of radiatively inefficient accretion flows. We show that the emission is highly variable at optically thin frequencies, with order-of-magnitude variability on timescales as short as the orbital period near the last stable orbit; this emission is linearly polarized at the similar to 20% - 50% level because of the coherent toroidalmagnetic field in the flow. At optically thick frequencies, both the variability amplitude and polarization fraction decrease significantly with decreasing photon frequency. We argue that these results are broadly consistent with the observed properties of SgrA* at the Galactic center, including the rapid infrared flaring.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据