孤立星系CIG 85（UGC 1547）中的HI不对称
HI asymmetry in the isolated galaxy CIG 85 (UGC 1547)
摘要：
本文介绍了利用巨米波射电望远镜（GMRT）对来自AMIGA（孤立星系星际介质分析）样本的孤立非对称星系CIG 85进行干涉HI和20 cm射电连续谱观测的结果。尽管是一个孤立的星系，CIG 85显示出明显的光学和HI光谱不对称性，因此是一个很好的候选人解决HI研究，以了解孤立星系中产生不对称性的原因。该星系的图像在HI和20厘米射电连续使用GMRT。为了详细讨论结果，我们还利用了来自SDSS、GALEX和Halalpha成像的多波长数据。我们发现CIG 85中的HI在西北部有一个聚集的、不对称的分布，这与光学尾状特征有关，但HI速度场显示出一个相对规则的旋转模式。评估所有的观测证据，我们得出的结论是，CIG 85最有可能是一个受干扰的旋涡星系，现在似乎有一个不规则星系的形态。虽然它目前与主要的伴星分离，但观测证据与HI不对称性一致，这是一个高度扰动的光盘，最近恒星形成的增加是由一次较小的合并引起的，其残余物现在投射在光盘前面。如果这是正确的，伴星将在不久的将来被CIG 85完全吸积。
英文摘要：
We present the results from the Giant Metrewave Radio Telescope (GMRT) interferometric HI and 20 cm radio continuum observations of CIG 85, an isolated asymmetric galaxy from the AMIGA (Analysis of the Interstellar Medium of Isolated GAlaxies) sample. Despite being an isolated galaxy, CIG 85 showed an appreciable optical and HI spectral asymmetry and therefore was an excellent candidate for resolved HI studies to understand the reasons giving rise to asymmetries in isolated galaxies. The galaxy was imaged in HI and 20 cm radio continuum using the GMRT. For a detailed discussion of the results we also made use of multi-wavelength data from archival SDSS, GALEX and Halpha imaging. We find the HI in CIG 85 to have a clumpy, asymmetric distribution which in the NW part is correlated with optical tail like features, but the HI velocity field displays a relatively regular rotation pattern. Evaluating all the observational evidence, we come to a conclusion that CIG 85 is most likely a case of a disturbed spiral galaxy which now appears to have the morphology of an irregular galaxy. Although it is currently isolated from major companions, the observational evidence is consistent with HI asymmetries, a highly disturbed optical disk and recent increase in star formation having been caused by a minor merger, remnants of which are now projected in front of the optical disk. If this is correct, the companion will be fully accreted by CIG 85 in the near future.
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