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arXiv 0810.1605astro-ph
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关于TeV Gamma-ray从HESS J1834-087发射的起源

On the Origin of TeV Gamma-ray Emission from HESS J1834-087

R. Mukherjee, E. V. Gotthelf, J. P. Halpern

摘要:

我们提出了一个X射线研究的领域包含扩展TeV源HESS J1834-087使用XMM-牛顿望远镜获得的数据。以前,这个源与壳型超新星遗迹(SNR)W 41和巨型分子云(GMC)的重合被解释为有利于旧SNR与GMC相互作用产生的π ^0衰变伽马射线。或者,TeV辐射被归因于PSR J1833-0827沉积的轻子的逆康普顿散射,一颗假设诞生于W 41的脉冲星,但现在位于距离SNR(和TeV源)中心24'的位置。相反,我们主张第三种可能性,即TeV辐射是由位于W 41中心附近的一个以前未知的脉冲星风星云提供动力的。候选的脉冲星是XMMU J183435.3-084443,一个硬X射线点源,缺乏R>21的光学对应物,并且与漫射X射线发射一致。点源X射线和漫反射X射线都具有明显的非热性和强吸收性。最佳拟合的幂律模型得出,点源和漫发射的光子指数分别为Gamma ~ 0.2和Gamma ~ 1.9,每个点源和漫发射的通量为2-10 keV ~ 5 × 10^(-13)尔格/cm^(2)/s。在距离W 41为4 kpc的位置上,观测到的X射线光度意味着一颗能量为Edot ~ 10^(36)d_4^2 ergs/s的高能脉冲星,这也足以通过逆康普顿散射产生观测到的伽马射线光度2.7 X 10^(34)d_4^2 ergs/s。

英文摘要:

We present an X-ray study of the field containing the extended TeV source HESS J1834-087 using data obtained with the XMM-Newton telescope. Previously, the coincidence of this source with both the shell-type supernova remnant (SNR) W41 and a giant molecular cloud (GMC) was interpreted as favoring pi^0-decay gamma-rays from interaction of the old SNR with the GMC. Alternatively, the TeV emission has been attributed to inverse Compton scattering from leptons deposited by PSR J1833-0827, a pulsar assumed to have been born in W41 but now located 24' from the center of the SNR (and the TeV source). Instead, we argue for a third possibility, that the TeV emission is powered by a previously unknown pulsar wind nebula located near the center of W41. The candidate pulsar is XMMU J183435.3-084443, a hard X-ray point source that lacks an optical counterpart to R>21 and is coincident with diffuse X-ray emission. The X-rays from both the point source and diffuse feature are evidently non-thermal and highly absorbed. A best fit power-law model yields photon index Gamma ~ 0.2 and Gamma ~ 1.9, for the point source and diffuse emission, respectively, and 2-10 keV flux ~ 5 X 10^(-13) ergs/cm^(2)/s for each. At the measured 4 kpc distance of W41, the observed X-ray luminosity implies an energetic pulsar with Edot ~ 10^(36)d_4^2 ergs/s, which is also sufficient to generate the observed gamma-ray luminosity of 2.7 X 10^(34)d_4^2 ergs/s via inverse Compton scattering.

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