主要内容:
分物质为主和辐射为主两种情形。
应该是辐射转移的一个很好的应用的例子。
精彩摘抄:
文章信息:
- · arXiv e-print (arXiv:1011.6005)
- · References in the Article
- ·
- · Translate This Page
| Title: |
| Radiative transfer in ultra-relativistic outflows and photospheres of gamma-ray bursts |
| Authors: |
| , Andrei M. |
| Publication: |
| eprint arXiv:1011.6005 |
| Publication Date: |
| 11/2010 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - High Energy Astrophysical Phenomena |
| Comment: |
| 13 pages, 8 figures, submitted to ApJ |
| Bibliographic Code: |
| 2010arXiv1011.6005B |
Abstract
Emission of gamma-ray bursts involves radiative transfer in ultra-relativistic jets. The corresponding transfer equation is solved. The solution describes the initial trapping of radiation in the opaque outflow, its adiabatic cooling, and the transition to transparency. Two opposite regimes are examined: (1) Baryon-dominated outflow. Surprisingly, radiation develops enormous anisotropy in the fluid frame before decoupling from the fluid. The radiation is strongly polarized. (2) Radiation-dominated outflow. The transfer occurs as if radiation propagated in vacuum, preserving the angular distribution and the blackbody shape of the spectrum. The observed photospheric spectrum is blackbody if (and only if) the outflow energy is dominated by radiation up to the photospheric radius.
没有评论:
发表评论