Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1133..317p&link_type=abstract
GAMMA-RAY BURST: Sixth Huntsville Symposium. AIP Conference Proceedings, Volume 1133, pp. 317-322 (2009).
Other
Gamma-Ray Sources, Gamma-Ray Bursts, Radiation Belts, Density Functional Theory, Local Density Approximation, Gradient And Other Corrections
Scientific paper
Recent analysis show evidence for a thermal emission component that accompanies the non-thermal emission during the prompt phase of GRBs. We show that this component is naturally explained by considering emission from the photosphere. The photosphere of a relativistically expanding plasma wind strongly depends on the angle to the line of sight, θ. As a result, thermal emission can be seen after tens of seconds. Using probability density function P(r,θ) to describe photon escape at radius r and angle θ, we show that the thermal flux is expected to decay at late times as FBB~t-2, and the observed temperature decays as T~t-α, with α~1/2-2/3. We discuss the relation between thermal emission and high energy, non-thermal spectra observed by FERMI. We show how thermal emission can be used to directly measure the Lorentz factor of the flow and the initial radius of the jet.
Pe'er Asaf
Ryde Felix
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