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arXiv 1010.4601astro-ph.HEastro-ph.CO
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GRB 100724 B瞬发发射中热光谱成分的检测

Detection of a Thermal Spectral Component in the Prompt Emission of GRB 100724B

Sylvain Guiriec, Valerie Connaughton, Michael S. Briggs, Michael Burgess, Felix Ryde, Frédéric Daigne, Peter Mészáros, Adam Goldstein, Julie McEnery, Nicola Omo… 展开作者

Sylvain Guiriec, Valerie Connaughton, Michael S. Briggs, Michael Burgess, Felix Ryde, Frédéric Daigne, Peter Mészáros, Adam Goldstein, Julie McEnery, Nicola Omodei, P. N. Bhat, Elisabetta Bissaldi, Ascensión Camero-Arranz, Vandiver Chaplin, Roland Diehl, Gerald Fishman, Suzanne Foley, Melissa Gibby, Misty M. Giles, Jochen Greiner, David Gruber, Andreas von Kienlin, Marc Kippen, Chryssa Kouveliotou, Sheila McBreen, Charles A. Meegan, William Paciesas, Robert Preece, Arne Rau, Dave Tierney, Alexander J. van der Horst, Colleen Wilson-Hodge

摘要:

用费米伽马射线暴监测器(GBM)对GRB 100724 B进行的观测发现,GRB 100724 B的光谱主要是典型的能带函数形式,它通常被用来表示非热辐射成分,但也包括统计上高度显著的热辐射谱贡献。同时观察热和非热成分使我们能够自信地识别两种发射成分。事实上,这些似乎是独立变化的主张,热分量是光球的起源,而占主导地位的非热辐射发生在较大的半径。我们的研究结果意味着一个非常高的效率为非热过程,或一个非常小的尺寸的区域的基础上的流动,这两个相当具有挑战性的标准火球模型。如果射流最初是高度磁化的,并且具有相当大的坡印亭通量,这些问题就可以解决。

英文摘要:

Observations of GRB 100724B with the Fermi Gamma-Ray Burst Monitor (GBM) find that the spectrum is dominated by the typical Band functional form, which is usually taken to represent a non-thermal emission component, but also includes a statistically highly significant thermal spectral contribution. The simultaneous observation of the thermal and non-thermal components allows us to confidently identify the two emission components. The fact that these seem to vary independently favors the idea that the thermal component is of photospheric origin while the dominant non-thermal emission occurs at larger radii. Our results imply either a very high efficiency for the non-thermal process, or a very small size of the region at the base of the flow, both quite challenging for the standard fireball model. These problems are resolved if the jet is initially highly magnetized and has a substantial Poynting flux.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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