外星系中大质量恒星形成的分子示踪
Molecular tracers of high mass star-formation in external galaxies
摘要：
在高红移的外部活动星系中，热核分子应该是可以探测到的。我们在这里提出了一个详细的研究化学物质的恒星形成区域的物理条件下，显着不同的那些可能是适当的银河系。我们研究，特别是，作为时间的函数的分子丰度的趋势，在相关的物理参数的变化。这些参数包括金属丰度、尘埃与气体的质量比、H $_{2}$的形成率、相对初始元素丰度、宇宙射线电离率和热核的温度。这些趋势表明不同的示踪剂如何提供有关物理条件和进化年龄的信息。我们确定几个观察到的星系，被认为是代表螺旋，活跃的星系，低金属量星系，高红移星系的热核示踪剂。即使在低金属丰度的例子中，许多潜在的分子示踪剂应该存在于足够高的水平，以允许未解决的检测活动星系在高红移含有大量的热核心。
英文摘要：
Hot core molecules should be detectable in external active galaxies out to high redshift. We present here a detailed study of the chemistry of star-forming regions under physical conditions that differ significantly from those likely to be appropriate in the Milky Way Galaxy. We examine, in particular, the trends in molecular abundances as a function of time with respect to changes in the relevant physical parameters. These parameters include metallicity, dust:gas mass ratio, the H$_{2}$ formation rate, relative initial elemental abundances, the cosmic ray ionization rate, and the temperature of hot cores. These trends indicate how different tracers provide information on the physical conditions and on evolutionary age. We identify hot core tracers for several observed galaxies that are considered to represent spirals, active galaxies, low-metallicity galaxies, and high-redshift galaxies. Even in low-metallicity examples, many potential molecular tracers should be present at levels high enough to allow unresolved detection of active galaxies at high redshift containing large numbers of hot cores.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
