Detection of a Thermal Spectral Component in the Prompt Emission of GRB 100724B
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....
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| creator | Guiriec, Sylvain Connaughton, Valerie Briggs, Michael S Burgess, Michael Ryde, Felix Daigne, Frédéric Mészáros, Peter Goldstein, Adam McEnery, Julie Omodei, Nicola Bhat, P N Bissaldi, Elisabetta Camero-Arranz, Ascensión Chaplin, Vandiver Diehl, Roland Fishman, Gerald Foley, Suzanne Gibby, Melissa Giles, Misty M Greiner, Jochen Gruber, David Andreas von Kienlin Kippen, Marc Kouveliotou, Chryssa McBreen, Sheila Meegan, Charles A Paciesas, William Preece, Robert Rau, Arne Tierney, Dave Alexander J van der Horst Wilson-Hodge, Colleen |
| description | 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. |
| doi_str_mv | 10.48550/arxiv.1010.4601 |
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| subjects | Gamma ray bursts Gamma rays Photosphere Physics - Cosmology and Nongalactic Astrophysics Physics - High Energy Astrophysical Phenomena Thermal emission |
| title | Detection of a Thermal Spectral Component in the Prompt Emission of GRB 100724B |
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