The Connection Between Thermal and Non-Thermal Emission in Gamma-ray Bursts: General considerations and GRB090902B as a Case Study

The Connection Between Thermal and Non-Thermal Emission in Gamma-ray Bursts : General considerations and GRB090902B as a Case Study

QC 20120302
Photospheric (thermal) emission is inherent to the gamma-ray burst (GRB) “fireball” model. We show that inclusion of this component in the analysis of the GRB prompt emission phase naturally explains some of the prompt GRB spectra seen by the Fermi satellite over its entire energy band. The sub-MeV peak is explained as multi-color black body emission, and the high energy tail, extending up to the GeV band, results from roughly similar contributions of synchrotron emission, synchrotron self Compton (SSC) and Comptonization of the thermal photons by energetic electrons originating after dissipation of the kinetic energy above the photosphere. We briefly discuss the theory of multicolor black body emission from relativistically expanding plasma, before showing how the analysis method proposed results in a complete, self consistent picture of the physical conditions at both emission sites of the thermal and non-thermal radiation. Furthermore, it enables to extract the values of the free model parameters. We demonstrate the analysis method on GRB090902B, and present the values of the physical parameters deduced. We briefly discuss the uniqueness of GRB090902B-type spectra.

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
explosions
photosphere
relativistic plasmas
brightness
Energetic particles
Stellar atmospheres ; radiative transfer; opacity and line formation
Relativistic plasmas
Magnitudes and colors; luminosities

Zhang, B. -B (författare)
Ryde, Felix,1970-KTH,Partikel- och astropartikelfysik(Swepub:kth)u1tlyg6w (författare)
McGlynn, SinéadKTH,Partikel- och astropartikelfysik(Swepub:kth)u18hd8ug (författare)
Zhang, B. (författare)
Preece, R. D. (författare)
Kouveliotou, C. (författare)
KTHPartikel- och astropartikelfysik (creator_code:org_t)

Ingår i:GAMMA RAY BURSTS 2010. American Institute of Physics Conference Series: AIP, s. 91-949780735409163

Av författaren/redakt...: Pe’Er, A.; Zhang, B. -B; Ryde, Felix, 197 ...; McGlynn, Sinéad; Zhang, B.; Preece, R. D.; visa fler...; Kouveliotou, C.; visa färre...

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