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Speaker |
Acuner, Zeynep |
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Coauthors |
Felix Ryde, Magnus Axelsson |
| Talk Title |
Varying faces of photospheric emission |
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Abstract |
Among the more than 1000 gamma-ray bursts observed by Fermi a large fraction show narrow and hard spectra inconsistent with non-thermal emission, signifying optically thick emission from the photosphere. However, only a few of these bursts have spectra consistent with a pure Planck function with the majority showing slightly broader spectra. We will discuss these bursts and summarise their observational features with focus on spectral evolution. We interpret the observations in light of models of subphotospheric dissipation, geometrical broadening and multi-zone emission, and show what we can learn about the dissipation mechanism and properties of GRB jets. |
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