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New developments in the ancient Pulsar Wind Nebulae scenario

机译:古代脉冲星云场景的新发展

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摘要

In a Pulsar Wind Nebula (PWN), the lifetime of inverse Compton emitting electrons exceeds the lifetimeof its progenitor pulsar, but it exceeds also the age of the electrons that emit via synchrotron radiation; i.e. while thePWN grows older, it can remain bright in IC, whereas its GeV-TeV gamma-ray (for 105-106years) flux remains high fortimescales much larger than the Pulsar lifetime and the PWN visible in X-rays. The shell-type remnant of the supernovaexplosion that led to the formation of the pulsar also has a much shorter lifetime. In this scenario, the magnetic field inthe cavity induced by the wind of the progenitor star plays a crucial role, but also the magnetic field in the interstellarmedium cannot be negligible and its outward decrease away from the Galactic disk further reduces their X-ray brightness.This is in line with the discovery of several unidentified sources in the TeV gamma-ray band without X-ray counterparts.Moreover, the consequences are important also in order to reinterprete the detection of starburst galaxies in the TeVgamma-ray band considering a leptonic origin of the gamma-ray signal.
机译:在脉冲星云(PWN)中,逆康普顿发射电子的寿命超过了其祖先脉冲星的寿命,但也超过了通过同步加速器辐射发射的电子的寿命。也就是说,虽然PWN变老了,但它在IC中仍然可以保持明亮,而其GeV-TeV伽马射线(105-106年)的通量在远大于脉冲星寿命和X射线可见的PWN的时间尺度上仍然很高。导致脉冲星形成的超新星爆炸的壳型残余物的寿命也短得多。在这种情况下,由前恒星的风引起的腔中的磁场起着至关重要的作用,但星际间的磁场也不能忽略不计,其向外远离银河系盘的减小进一步降低了它们的X射线亮度。这与在没有X射线对应物的TeV伽马射线带中发现了几个未知来源的结果是一致的。此外,为了重新解释考虑到轻子源的TeVγ射线带中的星爆星系的探测,其结果也很重要。伽马射线信号

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  • 会议地点 Beijing(CN)
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    ITPA, Universitat Wurzburg, Campus Hubland Nord, Emil-Fischer-Str. 31 D-97074 W urzburg, Germany;

    ITPA, Universitat Wurzburg, Campus Hubland Nord, Emil-Fischer-Str. 31 D-97074 W urzburg, Germany;

    Landessternwarte, Universitat Heidelberg, Konigstuhl, D 69117 Heidelberg, Germany;

    ITPA, Universitat Wurzburg, Campus Hubland Nord, Emil-Fischer-Str. 31 D-97074 W urzburg, Germany;

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  • 正文语种 eng
  • 中图分类 宇宙射线强度变化;
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