Skip to Main content Skip to Navigation
Journal articles

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

Abstract : 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.
Document type :
Journal articles
Complete list of metadata
Contributor : Hal Sorbonne Université Gestionnaire Connect in order to contact the contributor
Submitted on : Tuesday, April 19, 2022 - 4:27:31 PM
Last modification on : Wednesday, April 20, 2022 - 3:40:04 AM

Links full text



Sylvain Guiriec, Valerie Connaughton, Michael S. Briggs, Michael Burgess, Felix Ryde, et al.. Detection of a Thermal Spectral Component in the Prompt Emission of GRB 100724B. The Astrophysical Journal Letters, 2011, 727, ⟨10.1088/2041-8205/727/2/L33⟩. ⟨insu-03646070⟩



Record views