GALAH调查：尼克斯流没有河外起源的化学证据
The GALAH Survey: No chemical evidence of an extragalactic origin for the Nyx stream
摘要：
欧空局盖亚天体测量任务和深度光度测量的结果彻底改变了我们对银河系的认识。有许多正在进行的努力，以搜索这些数据的恒星子结构，以找到证据的个别吸积事件，建立了银河系和它的光环。这些新发现的特征之一，称为尼克斯，被宣布为在圆盘平面上行进的吸积恒星流。利用GALAH和APOGEE调查的元素丰度和恒星参数的组合，我们发现，最高可能性尼克斯成员的丰度是完全一致的厚盘的成员资格，并不符合矮星系的起源。我们的结论是，假设的尼克斯流是最有可能的银河系的厚盘的高速组件。随着包括运动学、恒星参数和详细丰度在内的大数据集的可用性不断增加，检测到偶然关联的概率也在增加，因此对子结构的新搜索需要在尽可能多的数据维度上进行确认。
英文摘要：
The results from the ESA Gaia astrometric mission and deep photometric surveys have revolutionized our knowledge of the Milky Way. There are many ongoing efforts to search these data for stellar substructure to find evidence of individual accretion events that built up the Milky Way and its halo. One of these newly identified features, called Nyx, was announced as an accreted stellar stream traveling in the plane of the disk. Using a combination of elemental abundances and stellar parameters from the GALAH and APOGEE surveys, we find that the abundances of the highest likelihood Nyx members are entirely consistent with membership of the thick disk, and inconsistent with a dwarf galaxy origin. We conclude that the postulated Nyx stream is most probably a high-velocity component of the Milky Way's thick disk. With the growing availability of large data sets including kinematics, stellar parameters, and detailed abundances, the probability of detecting chance associations increases, and hence new searches for substructure require confirmation across as many data dimensions as possible.
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