高红移亚毫米星系的尘埃收支危机
The dust budget crisis in high-redshift submillimetre galaxies
摘要：
我们应用一个化学演化模型来研究文献中26个高红移（$z>1$）亚毫米星系（SMG）样本中尘埃的来源和演化，从紫外到亚毫米的完整测光。我们发现，尘埃产生的低，中等质量的恒星下降的一个因素240短的观测到的尘埃质量的SMG，著名的“尘埃预算危机”。增加一个额外的超新星尘埃源可以解释SMG样本中19%的尘埃质量。即使在考虑了超新星产生的尘埃之后，尘埃质量预算中剩余的赤字也为更高的超新星产量、星际介质中的大量颗粒生长或头重脚轻的IMF提供了支持。包括有效的破坏尘埃超新星冲击增加了我们的模型和观测到的SMG尘埃质量之间的紧张关系。最好地再现SMG物理特性的模型具有来自恒星和星际源的尘埃的快速积累和最小的尘埃破坏。或者，调用一个头重脚轻的IMF或显着的变化，尘埃颗粒的性质可以解决尘埃预算危机，只有当尘埃是由低质量的恒星和超新星产生的，并没有有效地摧毁超新星冲击。
英文摘要：
We apply a chemical evolution model to investigate the sources and evolution of dust in a sample of 26 high-redshift ($z>1$) submillimetre galaxies (SMGs) from the literature, with complete photometry from ultraviolet to the submillimetre. We show that dust produced only by low-intermediate mass stars falls a factor 240 short of the observed dust masses of SMGs, the well-known `dust-budget crisis'. Adding an extra source of dust from supernovae can account for the dust mass in 19 per cent of the SMG sample. Even after accounting for dust produced by supernovae the remaining deficit in the dust mass budget provides support for higher supernova yields, substantial grain growth in the interstellar medium or a top-heavy IMF. Including efficient destruction of dust by supernova shocks increases the tension between our model and observed SMG dust masses. The models which best reproduce the physical properties of SMGs have a rapid build-up of dust from both stellar and interstellar sources and minimal dust destruction. Alternatively, invoking a top-heavy IMF or significant changes in the dust grain properties can solve the dust budget crisis only if dust is produced by both low mass stars and supernovae and is not efficiently destroyed by supernova shocks.
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