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arXiv 0810.5230astro-ph
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PSR J1833-1034及其相关脉冲星风星云的硬X射线观测

Hard X-ray observations of PSR J1833-1034 and its associated pulsar wind nebula

A. De Rosa, P. Ubertini, R. Campana, A. Bazzano, A. J. Dean, L. Bassani

摘要:

利用0.1 - 200 keV的X射线观测对PSR J1833-1034及其伴随的脉冲星风星云(PWN)进行了深入研究。来自钱德拉的低能X射线数据揭示了一种复杂的形态,其特征是明亮的中心plerion,没有热壳和扩展的扩散晕。从中央plerion的光谱发射软化与径向距离的脉冲星,与光谱指数范围从$Γ$ = 1.61在中央区域的$Γ$ =2.36在PWN的边缘。在更高的能量INTEGRAL探测到17- 200千电子伏范围内的源。数据分析清楚地表明,在硬X射线能量范围内的光谱发射的主要贡献来自PWN,而脉冲星是占主导地位的200 keV以上。最近HESS在高能γ射线领域的观测表明,PSR J 1833 -1034是一个明亮的TeV发射体,在1- 10 TeV范围内,其通量相当于蟹状星云的$\sim$ 2%。此外,在TeV能区的光谱形状与INTEGRAL观测到的硬X射线的光谱形状匹配良好。基于这些发现,我们得出结论,从脉冲星及其相关的PWN的发射可以描述在一个场景中,硬X射线产生通过同步光的电子与洛伦兹因子$γ\sim10^{9}$在磁场$\sim$ 10微高斯。在这个假设中,TeV辐射是由于冷却的电子与宇宙微波背景光子的逆康普顿相互作用。通过RXTE和Swift X射线观测,搜索PSR J1833-1034 X射线脉冲发射,得到的上限约为50%。

英文摘要:

PSR J1833-1034 and its associated Pulsar Wind Nebula (PWN) has been investigated in depth through X-ray observations ranging from 0.1 to 200 keV. The low energy X-ray data from Chandra reveal a complex morphology that is characterised by a bright central plerion, no thermal shell and an extended diffuse halo. The spectral emission from the central plerion softens with radial distance from the pulsar, with the spectral index ranging from $Γ$ = 1.61 in the central region to $Γ$ =2.36 at the edge of the PWN. At higher energy INTEGRAL detected the source in the 17--200 keV range. The data analysis clearly shows that the main contribution to the spectral emission in the hard X-ray energy range is originated from the PWN, while the pulsar is dominant above 200 keV. Recent HESS observations in the high energy gamma-ray domain show that PSR J1833-1034 is a bright TeV emitter, with a flux corresponding to $\sim$2 per cent of the Crab in 1--10 TeV range. In addition the spectral shape in the TeV energy region matches well with that in the hard X-rays observed by INTEGRAL. Based on these findings, we conclude that the emission from the pulsar and its associated PWN can be described in a scenario where hard X-rays are produced through synchrotron light of electrons with Lorentz factor $γ\sim10^{9}$ in a magnetic field of $\sim$10 micro Gauss. In this hypothesis the TeV emission is due to Inverse Compton interaction of the cooled electrons off the Cosmic Microwave Background photons. Search for PSR J1833-1034 X-ray pulsed emission, via RXTE and Swift X-ray observations, resulted in an upper limit that is about 50 per cent.

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