期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 727, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2041-8205/727/2/L33
关键词
acceleration of particles; gamma-ray burst: individual (GRB 1000724B); gamma rays: stars; radiation mechanisms: non-thermal; radiation mechanisms: thermal
资金
- German Bundesministerium fur Wirtschaft und Technologie (BMWi) via the Deutsches Zentrum fur Luft- und Raumfahrt (DLR) [50 QV 0301, 50 OG 0502]
- NASA [NNX08AL40G]
- Irish Research Council for Science, Engineering and Technology
- Marie Curie Actions
- Swedish National Space Board
- Division Of Physics
- Direct For Mathematical & Physical Scien [757155] Funding Source: National Science Foundation
Observations of GRB 100724B with the Fermi Gamma-Ray Burst Monitor 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.
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