AI 中文总结
研究本地宇宙中星系形态与恒星形成关系，发现大型形态学目录中静止晚期星系可能因分类错误导致数量高估，边缘 S0 星系代表性不足，建议消除偏差以构建准确的星系演化图景。
AI 中文摘要
在本地宇宙中，晚期和早期星系分别用于描述有旋臂的盘状星系和更以 bulge 为主且无螺旋结构的系统。这些形态常与不同恒星形成水平相关，促使经典情景中晚期和早期星系分别被视为恒星形成和‘红且死寂’的系统。为构建星系演化全貌，必须理解形态与恒星形成的关系并解释晚期星系中的静止等奇特构型。大型形态学目录是解决这些问题的宝贵工具，但不能盲目使用。我们发现，在这些目录中选择被分类为晚期的静止星系会导致与斯隆数字巡天中的一般星系群体相比，明显有过多形态不可靠的边缘星系。因此，该巡天中静止晚期星系的比例可能被高估了两倍。相反，被视为无螺旋臂的早期盘状星系 S0 在高倾角下代表性不足。我们得出结论，如果这些系统大多是被错误分类的边缘 S0 星系，就能解释边缘静止晚期星系过多的现象。我们提出了消除这种偏差的建议。
英文摘要
In the local Universe, the terms late-type and early-type are used to describe, respectively, disc galaxies with spiral arms and more bulge-dominated systems lacking spiral structure. These morphologies are often associated with different star formation levels, motivating the classical scenario where late-type and early-type galaxies are seen, respectively, as star-forming and "red and dead" systems. To build a comprehensive picture of galaxy evolution, we must understand the relationship between morphology and star formation, and be able to explain more exotic configurations, such as quiescence in late-type galaxies. Large morphological catalogues are valuable tools to address these questions, but they must not be used blindly. We show that selecting quiescent galaxies classified as late-type in these catalogues leads to a clear excess of edge-on systems, with unreliable morphologies, compared with the general galaxy population in the Sloan Digital Sky Survey. Consequently, the fraction of quiescent late-type galaxies in this survey could be overestimated by a factor of two. Conversely, S0 galaxies, considered early-type discs without spiral arms, are under-represented at high inclinations. We conclude that the excess of edge-on quiescent late-type galaxies can be explained if most of these systems are misclassified edge-on S0 galaxies. We make recommendations to remove this bias.
CommentsAccepted for publication in MNRAS Letters, 6 pages, 3 figures
