Photon Acceleration at Shock Breakout of Trans-Relativistic Supernova

Details Photon Acceleration at Shock Breakout of Trans-Relativistic Supernova Photon Acceleration at Shock Breakout of Trans-Relativistic Supernova

2007-05-28

arxiv.org/abs/0705.3958v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figs, talk at Amsterdam 2007 GRB meeting. No figs in the version for the proceedings "070228: The Next Decade of Ga

Scientific paper

The predicted thermal flash from SN shock breakout might have been detected for the first time by Swift in GRB 060218/SN 2006aj. The detected thermal X-ray emission in this event implies emergence of a trans-relativistic (TR) SN shock with kinetic energy of E_k>1E49 erg. During TRSN shock breakout, the thermal photons could be "accelerated" by the shock through repeated bulk Compton scattering, forming a nonthermal gamma/X-ray component with dominant energy over thermal one. This mechanism of "photon acceleration" at TRSN shock breakout might also account for gamma-rays in the other similar low-luminosity GRBs, implying that they are atypical GRBs with only TR outflows. TRSNe form a peculiar type of SNe with large kinetic energy, >1E49 erg, in TR ejecta, \Gamma\beta ~2.

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