AI 中文总结
该研究通过ALMA项目ALCHEMI对比银河系与NGC 253的CMZ化学，发现二者相关性极佳，ALMA升级将拓展此类对比范围。
AI 中文摘要
数十年来，对河外星系的化学研究一直受限于灵敏度、分辨率、带宽或其组合。ALMA运行的十年间，详细研究邻近星系的分子丰度已成为常规工作。我们终于能通过一对一对比，将星际介质（ISM）化学从银河系环境延伸至河外星系环境，尽管探测的尺度差异显著。ALMA大型项目ALCHEMI以空前的灵敏度和分辨率组合对星暴星系NGC 253的化学进行成像，获得了详细的空间分辨化学 inventory。ALCHEMI探测了其中心分子区（CMZ）内不同区域的分子差异，并允许与银河系环境（包括热核、宁静分子云和彗星）进行对比。该对比可置于其他河外星系环境的可用数据背景下。总体而言，此处呈现的对比显示，银河系巨分子云（GMC）与NGC 253的CMZ化学之间存在惊人良好的相关性，尺度范围从1 pc到约0.5 kpc。ALMA的宽带灵敏度升级将把类似对比扩展至更广泛的银河系和河外星天体。
英文摘要
For decades, chemical studies in external galaxies have been limited by sensitivity, resolution, bandwidth or a combination of them. A decade of ALMA operations, made the detailed study of the molecular abundances in nearby galaxies a routine job. We can finally bridge the ISM chemistry from Galactic to extragalactic environments, through one to one comparison, albeit probing significantly different scales. The ALMA large program ALCHEMI imaged the chemistry of the starburst galaxy NGC 253 at an unprecedented combination of sensitivity and resolution, achieving a detailed spatially resolved chemical inventory. ALCHEMI probed molecular differences among regions within its CMZ, and allowed the comparison with Galactic environments ranging from hot cores, quiescent molecular clouds and comets. This comparison can be put in the context of available data towards other extragalactic environments. Globally, the comparisons presented here show an astoundingly good correlation between the chemistry in Galactic GMCs and the central molecular zone of NGC 253, ranging scales from 1 pc up to ~0.5 kpc. The wideband sensitivity upgrade of ALMA will expand similar comparisons towards a wider range of Galactic and extragalactic objects.
Comments6 pages, 3 figures, Proceedings of IAU Symposium 405
