期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 441, 期 2, 页码 1005-1016出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu599
关键词
accretion; accretion discs; black hole physics; MHD; radiation mechanisms: general; Galaxy: centre
资金
- European Community [ITN 215212]
- 'Nederlandse Onderzoekschool Voor Astronomie' NOVA Network-3 under NOVA [R.2320.0086]
- Netherlands Organization for Scientific Research (NWO) Vidi Fellowship
- French National Research Agency (CHAOS) [ANR-12-BS05-0009]
- Programme National Hautes Energies
We present a new way of describing the flares from Sgr A* with a self-consistent calculation of the particle distribution. All relevant radiative processes are taken into account in the evolution of the electron distribution and resulting spectrum. We present spectral modelling for new X-ray flares observed by NuSTAR, together with older observations in different wavelengths, and discuss the changes in plasma parameters to produce a flare. We show that under certain conditions, the real particle distribution can differ significantly from standard distributions assumed in most studies. We conclude that the flares are likely generated by magnetized plasma consistent with our understanding of the accretion flow. Including non-thermal acceleration, injection, escape, and cooling losses produces a spectrum with a break between the infrared and the X-ray, allowing a better simultaneous description of the different wavelengths. We favour the non-thermal synchrotron interpretation, assuming the infrared flare spectrum used is representative. We also consider the effects on Sgr A*'s quiescent spectrum in the case of a density increase due to the G2 encounter with Sgr A*.
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