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arXiv 1201.3533astro-ph.HE
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1843年Eta Carinae冲击波非热辐射的限制

Constraints on the non-thermal emission from Eta Carinae's blast wave of 1843

J. L. Skilton, W. Domainko, J. A. Hinton, D. I. Jones, S. Ohm, J. S. Urquhart

摘要:

最近使用INTEGRAL、AGILE和Fermi卫星探测到了海山二方向的非热硬X射线和高能(1 MeV < E < 100 GeV)伽马射线发射。这种发射被解释为在两颗大质量恒星之间碰撞风区的粒子加速框架中,或者在起源于历史上的1843年“大爆发”的非常快速移动的冲击波中。钱德拉的档案数据被重新分析,以寻找海山二爆炸波中粒子加速的特征。在硬X射线中无法检测到壳状结构,并且对壳的非热X射线发射进行了限制。利用“侏儒”目标辐射场的时间依赖性,建立了爆炸波的单区模型。尝试使用该模型来协调X射线极限与HE射线发射导致非常硬的电子注入谱dN/dE ~ E^-Gamma,其中Gamma < 1.8,比从扩散冲击加速预期的正则值更硬。

英文摘要:

Non-thermal hard X-ray and high-energy (HE; 1 MeV < E < 100 GeV) gamma-ray emission in the direction of Eta Carinae has been recently detected using the INTEGRAL, AGILE and Fermi satellites. This emission has been interpreted either in the framework of particle acceleration in the colliding wind region between the two massive stars or in the very fast moving blast wave which originates in the historical 1843 "Great Eruption". Archival Chandra data has been reanalysed to search for signatures of particle acceleration in Eta Carinae's blast wave. No shell-like structure could be detected in hard X-rays and a limit has been placed on the non-thermal X-ray emission from the shell. The time dependence of the target radiation field of the Homunculus is used to develop a single zone model for the blast wave. Attempting to reconcile the X-ray limit with the HE -ray emission using this model leads to a very hard electron injection spectrum dN/dE ~ E^-Gamma with Gamma < 1.8, harder than the canonical value expected from diffusive shock acceleration.

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