Subphotospheric heating in GRBs: analysis and modeling of GRB090902B as observed by Fermi

Details Subphotospheric heating in GRBs: analysis and modeling of GRB090902B as observed by Fermi Subphotospheric heating in GRBs: analysis and modeling of GRB090902B as observed by Fermi

2011-11-01

arxiv.org/abs/1111.0308v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

2011 Fermi Symposium proceedings - eConf C110509

Scientific paper

We analyze the spectral evolution of GRB 090902B and show that subphotospheric dissipation can explain both the spectra and the spectral evolution. The emission from a GRB photosphere can give rise to a variety of spectral shapes. The spectrum can have a shape close to that of a Planck function (as is observed during the first half of GRB090902B) or be broadened, resembling a typical Band function (as is observed during the second half of GRB090902B). The shape mainly depends on the strength and location of the dissipation in the jet, the ratio of the energy densities of thermal photons and of the electrons at the dissipation site, as well as on the strength of the magnetic field. We further discuss numerical models of the dissipation and relate these to the observed spectra.

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