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arXiv 0906.5503astro-ph.HE
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用MAGIC望远镜寻找耀变体周围的扩展发射

Search for an extended emission around blazars with the MAGIC telescope

Julian Sitarek, Razmik Mirzoyan

摘要:

来自河外源的极高能量伽马射线可以与星系际辐射场相互作用。这个过程可能会导致电磁级联,其循环如下:产生电子-正电子对,然后由于逆康普顿散射产生次级伽马射线。由于电子和正电子在星系际磁场中会被散射,在某些条件下,它们的辐射可能会重新导向观测者。因此,我们可以预期,二次伽马射线发射可能会在源周围产生明显的扩展晕。MAGIC是一台成像大气切伦科夫望远镜,位于加那利群岛的拉帕尔马,Roque de los Muchachos天文台(2200 m.a.s.l)。利用MAGIC望远镜的专用蒙特卡罗模拟,研究了$1^\circ$直径范围内的各种源尺寸和扩展发射轮廓。我们目前的研究结果的一个可能的扩展发射Mrk 421和Mrk 501完成的MAGIC望远镜。

英文摘要:

Very high energy gamma rays coming from extra-galactic sources can interact with intergalactic radiation fields. This process may result in electromagnetic cascades with the following cycle: the production of electron-positron pairs and then secondary gamma-rays due to inverse Compton scattering. Since electrons and positrons will be scattered in the intergalactic magnetic field, under certain conditions their radiation may be redirected towards the observer. Thus one can anticipate that the secondary gamma-ray emission may produce an apparent extended halo around the source. MAGIC is an Imaging Atmospheric Cerenkov Telescope located on Canary island of La Palma at Roque de los Muchachos Observatory (2200 m.a.s.l). Various source sizes and extended emission profiles within $1^\circ$ diameter have been studied by using dedicated Monte Carlo simulations for the MAGIC telescope. We present results of the study of a possible extended emission for Mrk 421 and Mrk501 done with the MAGIC telescope.

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