星系中的HNCO丰度：追踪星爆的演化状态
HNCO abundances in galaxies: Tracing the evolutionary state of starbursts
摘要：
星系中心区域的化学物质预计会受到其核活动的强烈影响。寻找核活动的最佳示踪剂对于了解星系核中最模糊区域发生的过程至关重要。在这项工作中，我们提出了CS，C34 S，HNCO和C18 O在11个明亮的星系原型不同类型的活动的样本多线观测。32 S/34 S同位素比值约为10，支持34 S同位素富集是由于星系核区域的大质量恒星形成。虽然C32 S和C34 S似乎不受活动类型的显著影响，但HNCO丰度在星爆之间存在高度对比。我们观察到HNCO丰度变化近两个数量级。的HNCO分子被证明是一个很好的示踪剂的分子物质的量燃料的星暴，因此可以被用来作为一个核星暴的演化状态的诊断。
英文摘要：
The chemistry in the central regions of galaxies is expected to be strongly influenced by their nuclear activity. To find the best tracers of nuclear activity is of key importance to understand the processes taking place in the most obscured regions of galactic nuclei. In this work we present multi-line observations of CS, C34S, HNCO and C18O in a sample of 11 bright galaxies prototypical for different types of activity. The 32S/34S isotopic ratio is ~10, supporting the idea of an isotopical 34S enrichment due to massive star formation in the nuclear regions of galaxies. Although C32S and C34S do not seem to be significantly affected by the activity type, the HNCO abundance appears highly contrasted among starburst. We observed HNCO abundance variations of nearly two orders of magnitude. The HNCO molecule is shown to be a good tracer of the amount of molecular material fueling the starburst and therefore can be used as a diagnostics of the evolutionary state of a nuclear starburst.
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