报告题目: Model independent constraints on magnetic field strength in the remnant of the historical supernova SN 1006.

报 告 人：Fabrizio Bocchino 教授（意大利天体物理研究所）

时　  间：5月17日上午10：30

地　  点：南大蒙民伟楼2402

内容摘要: The remnant of SN 1006 is considered the archetype of cosmic ray accelerating shells. It shows two bright limbs associated to the regions where the acceleration occurs. These bright limbs coincide spatially in various bands, they have different brightness, and the contrast of brightness varies from radio to gamma-rays. The reasons of such properties and the role of the magnetic field strength are discussed. Model-independent methods and analytical approximations for the derivation of the strength of magnetic field from the comparison of radio, X-rays and TeV images of SNRs are presented. The methods require the TeV gamma-ray image to be well resolved and accurate, in order to put reasonable constraints on magnetic field. If we apply it to the recent HESS observation of SN1006, they limit the strength of magnetic field in limbs of SN1006 to values lower than few hundreds micro Gauss.