THE FATE OF STELLAR MASS LOSS IN CENTRAL CLUSTER GALAXIES
THE FATE OF STELLAR MASS LOSS IN CENTRAL CLUSTER GALAXIES
复制标题
中央星系团中恒星质量损失的命运
DOI：
10.1088/2041-8205/738/2/l24
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
M. Donahue
中科院分区：
文献类型：
--
作者：
G. Voit;M. Donahue
星系团中央星系内的恒星形成通常被解释为是由星系团内高温介质的冷却提供燃料的。然而，形成恒星的气体是尘埃的，斯皮策光谱显示，尘埃的性质类似于更正常的恒星形成环境中的尘埃，在这种环境中，尘埃来自垂死恒星的风。在这里，我们考虑中心星系团中恒星形成气体的主要来源是否可能是正常的恒星质量损失。我们表明，在一个大型中心星系(∼4-8 M☉ yr−1)中，除了最极端的情况外，总的恒星质量损失率至少与观测到的恒星形成率一样大，并且必须包括在任何对中心星系团星系气体质量收支的评估中。我们还提出了一些论点，认为核心压力高、中心冷却时间短的星系团中的恒星释放的气体可能保持凉爽，与其炎热的环境截然不同，从而保留了其中的尘埃。
Star formation within the central galaxies of galaxy clusters is often interpreted as being fueled by cooling of the hot intracluster medium. However, the star-forming gas is dusty, and Spitzer spectra show that the dust properties are similar to those in more normal star-forming environments, in which the dust has come from the winds of dying stars. Here we consider whether the primary source of the star-forming gas in central cluster galaxies could be normal stellar mass loss. We show that the overall stellar mass-loss rate in a large central galaxy (∼4–8 M☉ yr−1) is at least as large as the observed star formation rates in all but the most extreme cases and must be included in any assessment of the gas-mass budget of a central cluster galaxy. We also present arguments suggesting that the gas shed by stars in galaxy clusters with high core pressures and short central cooling times may remain cool and distinct from its hot surroundings, thereby preserving the dust within it.