Subaru Deep Field中的一个候选极环星系
A candidate polar-ring galaxy in the Subaru Deep Field
摘要：
我们讨论了斯巴鲁深场（SDF）中的一个对象的属性，该对象在在线数据库中被归类为星系，并在斯巴鲁图像上显示为真正的极环星系（PRG）候选者。我们分析了现有的光度数据，并得出结论，该对象包括一个>5 Gyr老的早期型中心体周围的微弱，狭窄的内环倾斜在一个~25度角相对于主星系的极轴。围绕着主恒星的晕圈表现出多种多样的低表面亮度的空间扩展恒星特征，包括一个微弱的不对称恒星云和两个突出的环。这些微弱的特征，加上中央宿主的未受扰动的形态，是两个高度不等质量星系最近合并的明显迹象，很可能是一个预先存在的早期星系和一个附近的富含气体的矮星系。在环边缘附近观测到的恒星残骸，可能包括幸存的被捕获的伴星本身，表明合并仍在进行。
英文摘要：
We discuss the properties of an object in the Subaru Deep Field (SDF) classified as a galaxy in on-line data bases and revealed on the Subaru images as a genuine polar-ring galaxy (PRG) candidate. We analyse available photometric data and conclude that this object consists of a >5 Gyr old early-type central body surrounded by a faint, narrow inner ring tilted at a ~25 deg angle relative to the polar axis of the host galaxy. The halo surrounding the main stellar body exhibits a diversity of spatially extended stellar features of low surface brightness, including a faint asymmetric stellar cloud and two prominent loops. These faint features, together with the unperturbed morphology of the central host, are clear signs of a recent coalescence of two highly unequal mass galaxies, most likely a pre-existing early-type galaxy and a close-by gas-rich dwarf galaxy. The presumed stellar remnants observed near the edges of the ring, including possibly the surviving captured companion itself, indicate that the merger is still taking place.
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