发表机构
The University of Texas at Austin; INAF-IAPS; INAF, Sezione di Lecce; University of Kentucky; National Astronomical Observatory of Japan; Max Planck Institute for Radio Astronomy; The Ohio State University（德克萨斯大学奥斯汀分校; 意大利国家天体物理研究所空间天文与物理学中心; 意大利国家天体物理研究所莱切分部; 肯塔基大学; 日本国立天文台; 马克斯·普朗克射电天文研究所; 俄亥俄州立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究以PHANGS项目方法分析银河系分子云星表，发现其耗尽时间特性与河外星系相似，明确了影响结果的关键因素及空间分辨率不足的重要影响。
AI 中文摘要
银河系的分子云完整星表可用于分析银河系的分子介质及恒星形成特性，其分析方法与邻近星系（尤其是PHANGS项目）所采用的方法高度一致。以类似方式分析时，银河系分子气体的耗尽时间对其他特性的依赖关系与其他星系相似，呈现出较大的离散度和相对较弱的相关性，其中最强的相关性是耗尽时间随速度弥散度的增加而降低。我们探究了空间分辨率、灵敏度、云识别方法、平均方法及示踪剂选择对结果的影响，在将观测数据转换为质量时，金属丰度效应会产生显著影响。较为巧合的是，PHANGS项目与银河系研究之间转换方法的差异不会影响当前的比较结果，而导致云结构未被分辨的空间分辨率不足，对河外观测及现有银河系云星表的解释具有最重要的影响。
英文摘要
Complete catalogs of molecular clouds in the Milky Way allow analysis of the molecular medium and the star formation properties of the Milky Way that closely follows the method used for nearby galaxies, in particular in the PHANGS project. The dependencies of the depletion time on other properties of molecular gas in the Milky Way are similar to those of other galaxies when analyzed in an analogous way. They exhibit a large scatter and relatively weak correlations. The strongest correlation is a decrease in depletion time with increasing velocity dispersion. We explore the effects of spatial resolution, sensitivity, cloud identificaton method, averaging method, and tracer choice on our results. Metallicity effects in converting observations to mass can have a substantial impact. Somewhat fortuitously, differences in conversion methods between PHANGS and the Milky Way do not affect the current comparison. Inadequate spatial resolution, resulting in unresolved cloud structure, has the most important effect on interpretation of both extragalactic observations and existing catalogs of Milky Way clouds.
Comments23 pages, 13 figures, journal publication, revised version corrects tables and figures by small amounts
