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IMF variations in dwarf galaxies

机译:矮星系的IMF变化

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Dwarf galaxies tend to have a large spread in metal abundances and overall lowermetallicites than large Spiral or Elliptical ones. Here we propose that if all stars are formedfrom an invariant canonical IMF within each star cluster which are distributed according toan embedded cluster mass function (ECMF), then the integrated stellar IMF over the wholegalaxy (the integrated galaxial IMF, IGIMF) must be steeper than the canonical IMFs withinthe clusters, and additionally they must depended on the stellar mass of the galaxy. In partic-ular, dwarf galaxies and low-surface brightness galaxies show steeper galaxial IMFs which varystrongly with the star-formation rate. The resulting number of Supernovae II per low-mass star,and the chemical enrichment history of these galaxies therefore vary substantially depending onthe galaxy assembly history.
机译:矮星系往往在金属丰富和整体螺旋状物中具有大于大型螺旋或椭圆形的大量蔓延。在这里,我们提出如果所有恒星都是在每个星形集群内的不变规范IMF,则根据涉及嵌入式簇质量功能(ECMF),那么在全乙酰XY(集成的GALAXIAL IMF,IGIMF)上的集成恒星IMF必须比其更陡峭规范IMFS含有群集,另外它们必须取决于星系的恒星质量。在拟坐标,矮星系和低表面亮度星系显示陡峭的星系IMF,其具有恒星形成速率。因此,每个低质量恒星的超胃部II的数量和这些星系的化学富集历史在基本上取决于星系组装历史。

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