题  目：Gamma-ray burst afterglow optical polarimetry: looking at the shock front

报告人：Stefano Covino  研究员
　　　　　  (INAF / Brera Astronomical Observatory)

摘  要: Gamma-ray bursts and their afterglows are thought to be produced by an ultrarelativistic jet. One of the most important open questions is the outflow composition: the energy may be carried out from the central source either as kinetic energy (of baryons and/or pairs), or in electromagnetic form (Poynting flux). While the total observable flux may be indistinguishable in both cases, its polarization properties are expected to differ markedly. The later time evolution of afterglow polarization is also a powerful diagnostic of the jet geometry. Again, with subtle and hardly detectable differences in the output flux, we have distinct polarization predictions.

时  间：2010年6月22日（星期二）下午4:00

地  点：（北京西路2号）紫台大楼大327教室

 

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　　　　　　　　　　　　　　　　　　 紫金山天文台学术委员会学术交流工作委员会
　　　　　　　　　　　　　　　　　　　　　　　　　　  2010年6月21日