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arXiv 1402.4309astro-ph.HEhep-ph
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脉冲星风星云方案中Milagro TeV源MGRO J2019 +37的TeV gamma ray发射的同步加速器自康普顿机制的约束

Constraints on the synchrotron self-Compton mechanism of TeV gamma ray emission from the Milagro TeV source MGRO J2019+37 within the pulsar wind nebula scenario

Lab Saha, Pijushpani Bhattacharjee

摘要:

在脉冲星风星云(PWN)方案中,使用与该物体相关的源的多波长信息,研究了Milagro实验发现的MGRO J2019+37的TeV伽马射线发射的起源。我们发现,PWN场景中观测到的TeV伽马射线的同步自康普顿(SSC)起源机制受到巨型米波射电望远镜(GMRT)给出的MGRO J2019+37周围区域的无线电通量上限以及SWIFT/XRT的x射线通量上限的严重限制。具体来说,对于SSC机制来解释从MGRO J2019+37观测到的TeV通量,而不违反射电和X射线区域的GMRT和/或Swift/XRT通量上限,发射区域必须非常紧凑,发射区域的特征尺寸限制在$\lsim{\mathcal O}(10^{-4}\pc)$,假设距离源$\sim$几kpc。这是至少四个数量级小于特征尺寸的发射区域通常调用在解释TeV的排放通过SSC机制在PWN的情况下。另一方面,星云高能电子在宇宙微波背景(CMB)光子上的逆康普顿(IC)散射可以在不违反GMRT和/或SWIFT/XRT通量边界的情况下,在合理的参数范围内解释观测到的TeV通量。

英文摘要:

Origin of the TeV gamma ray emission from MGRO J2019+37 discovered by the Milagro experiment is investigated within the pulsar wind nebula (PWN) scenario using multiwavelength information on sources suggested to be associated with this object. We find that the synchrotron self-Compton (SSC) mechanism of origin of the observed TeV gamma rays within the PWN scenario is severely constrained by the upper limit on the radio flux from the region around MGRO J2019+37 given by the Giant Metrewave Radio Telescope (GMRT) as well as by the x-ray flux upper limit from SWIFT/XRT. Specifically, for the SSC mechanism to explain the observed TeV flux from MGRO J2019+37 without violating the GMRT and/or Swift/XRT flux upper limits in the radio and x-ray regions, respectively, the emission region must be extremely compact with the characteristic size of the emission region restricted to $\lsim{\mathcal O}(10^{-4}\pc)$ for an assumed distance of $\sim$ few kpc to the source. This is at least four orders of magnitude less than the characteristic size of the emission region typically invoked in explaining the TeV emission through the SSC mechanism within the PWN scenario. On the other hand, inverse Compton (IC) scattering of the nebular high energy electrons on the cosmic microwave background (CMB) photons can, for reasonable ranges of values of various parameters, explain the observed TeV flux without violating the GMRT and/or SWIFT/XRT flux bounds.

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