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arXiv 0801.1255astro-ph
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超新星遗迹IC 443与分子云相互作用区域内的孤立X射线-红外源

Isolated X-ray -- infrared sources in the region of interaction of the supernova remnant IC 443 with a molecular cloud

A. M. Bykov, A. M. Krassilchtchikov, Yu. A. Uvarov, H. Bloemen, F. Bocchino, G. M. Dubner, E. B. Giacani, G. G. Pavlov

摘要:

利用XMM-Newton、Chandra和Spitzer观测研究了扩展硬X射线源XMMU J061804.3+222732及其周围环境的性质。这个源位于IC 443超新星遗迹与邻近分子云的相互作用区域。X射线发射由许多明亮的团块组成,这些团块嵌在一个尺寸大于30”的扩展结构非热X射线星云中。在99%的置信水平下,一些团块显示出在~1.9 keV和~3.7 keV处的线发射的证据。IC 443的大规模弥散射电辐射经过源区域,在源附近增强。在24 μ m、70 μ m和2.2 μ m波段中,与假定的Si K壳层X射线线发射区域相邻的是约14”× 7”尺寸的IR源。所观察到的IR/X射线的形态和光谱是一致的预期的J/C型冲击不同的速度驱动的破碎的超新星喷出物碰撞的分子云的致密介质。斯皮策探测到的源的红外辐射可以归因于喷出物碎片产生的HII区域的连续辐射和激波激发的线辐射。IC 443中的这个源区域可能是恒星形成区域的致密环境中超新星爆炸产生的大量硬X射线/IR源的一个例子。替代银河系和河外的解释所观察到的源进行了讨论。

英文摘要:

The nature of the extended hard X-ray source XMMU J061804.3+222732 and its surroundings is investigated using XMM-Newton, Chandra, and Spitzer observations. This source is located in an interaction region of the IC 443 supernova remnant with a neighboring molecular cloud. The X-ray emission consists of a number of bright clumps embedded in an extended structured non-thermal X-ray nebula larger than 30" in size. Some clumps show evidence for line emission at ~1.9 keV and ~3.7 keV at the 99% confidence level. Large-scale diffuse radio emission of IC 443 passes over the source region, with an enhancement near the source. An IR source of about 14" x 7" size is prominent in the 24 um, 70 um, and 2.2 um bands, adjacent to a putative Si K-shell X-ray line emission region. The observed IR/X-ray morphology and spectra are consistent with those expected for J/C-type shocks of different velocities driven by fragmented supernova ejecta colliding with the dense medium of a molecular cloud. The IR emission of the source detected by Spitzer can be attributed to both continuum emission from an HII region created by the ejecta fragment and line emission excited by shocks. This source region in IC 443 may be an example of a rather numerous population of hard X-ray/IR sources created by supernova explosions in the dense environment of star-forming regions. Alternative Galactic and extragalactic interpretations of the observed source are also discussed.

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