NGC 2207/ IC 2163：与大尺度冲击波的擦撞
NGC 2207/IC 2163: A Grazing Encounter with Large Scale Shocks
摘要：
射电连续谱、斯皮策红外、光学和XMM-牛顿X射线和UVM 2观测被用来研究相互作用星系NGC 2207/IC 2163中的大尺度激波阵面、年轻恒星复合体和星系核。在这对星系中有两种类型的大尺度激波锋面。沿着IC 2163眼椭圆边缘的激波阵面在尘埃环境中产生了活跃的恒星形成。在NGC 2207的伴星侧的外部，一个大规模的由盘或晕刮造成的锋面在射电连续谱中特别明亮，但在最近恒星形成的任何示踪物或X射线中都没有。这种射电连续谱阵面可能主要位于两个星系之间的NGC 2207背面的晕中。NGC 2207/IC 2163中千帕秒大小的斯皮策IRAC恒星形成团块的通量密度比S（8 μ m）/S（6 cm）值与M81中巨大H II区域的通量密度比S（8 μ m）/S（6 cm）进行了比较。我们发现的证据表明，在2001年，一颗射电超新星出现在特征i的核心，这是NGC 2207外臂上的一个小型星暴。NGC 2207的核和9个离散的源都有X射线辐射，其中一个对应SN 1999 ec，另一个可能是射电超新星或背景类星体。NGC 2207核的X射线光度和X射线光谱表明它是一个高吸收、低光度的活动星系核。
英文摘要：
Radio continuum, Spitzer infrared, optical and XMM-Newton X-ray and UVM2 observations are used to study large-scale shock fronts, young star complexes, and the galactic nuclei in the interacting galaxies NGC 2207/IC 2163. There are two types of large-scale shock fronts in this galaxy pair. The shock front along the rim of the ocular oval in IC 2163 has produced vigorous star formation in a dusty environment. In the outer part of the companion side of NGC 2207, a large-scale front attributed to disk or halo scraping is particularly bright in the radio continuum but not in any tracers of recent star formation or in X-rays. This radio continuum front may be mainly in the halo on the back side of NGC 2207 between the two galaxies. Values of the flux density ratio S(8 um)/S(6 cm) of kpc-sized, Spitzer IRAC star-forming clumps in NGC 2207/IC 2163 are compared with those of giant H II regions in M81. We find evidence that in 2001 a radio supernova was present in the core of feature i, a mini-starburst on an outer arm of NGC 2207. X-ray emission is detected from the NGC 2207 nucleus and from nine discrete sources, one of which corresponds to SN 1999ec, and another may be a radio supernova or a background quasar. The X-ray luminosity and X-ray spectrum of the NGC 2207 nucleus suggests it is a highly absorbed, low luminosity AGN.
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