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A study of iron and dust in the supernova remnant IC 443

机译:超新星残留IC 443中铁和尘埃的研究

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We performed near-infrared line mapping of the supernova remnant IC 443 with the IRSF 1.4-m telescope, using the narrow-band filters tuned for [Fe II] 1.257 mu m, [Fe II] 1.644 mu m, and Pa beta. We detected the [Fe II] and Pa beta emissions from a very wide area of the observed region (30' x 35'). These line intensity maps reveal a global correlation between [Fe II] and Pa beta. Kokusho et al. (2013) found that the [Fe II] emission is notably strong while dust emission is faint in inner regions of IC 443. These results indicate that the abundant Fe+ is likely to be of interstellar origins through shock destruction of dust, rather than of ejecta origins. From the X-ray intensity map of the 6.7 key Fe-K line obtained with Suzaku, we find that highly ionized He-like Fe ions exist in the inner regions of IC 443, toward which Fe+ is detected. The presence of the He-like Fe ions and the faint dust emission indicates that Fe is likely to be interacting with X-ray plasma for a time long enough to be highly ionized. We discuss the implications of the detection of the lowly ionized Fe ions in such regions for the processing and composition of dust in the interstellar environment around IC 443. (C) 2015 Elsevier Ltd. All rights reserved.
机译:我们使用调谐为[Fe II] 1.257μm,[Fe II] 1.644μm和Pa beta的窄带滤光片,用IRSF 1.4-m望远镜对超新星残留IC 443进行了近红外线映射。我们从观察区域的非常宽的区域(30'x 35')检测到[Fe II]和Pa beta排放。这些线强度图揭示了[Fe II]和Pa beta之间的全局相关性。 Kokusho等。 (2013年)发现,在IC 443的内部区域,[Fe II]的发射特别强,而粉尘的发射却微弱。这些结果表明,大量的Fe +可能是通过尘埃的冲击破坏而不是喷射而星际起源的。起源。从用朱雀获得的6.7键Fe-K谱线的X射线强度图,我们发现在IC 443的内部区域中存在着高度电离的He样Fe离子,并向其中检测到Fe +。类氦的铁离子的存在和微弱的粉尘发射表明,铁很可能与X射线等离子体相互作用的时间足够长,以至于被高度电离。我们讨论了在此类区域中检测低电离的Fe离子对IC 443周围星际环境中粉尘的处理和组成的意义。(C)2015 Elsevier Ltd.保留所有权利。

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