论文标题
迅速出生的巨人 - 顶级恒星初始质量功能对球形簇的出生条件的影响
The giants that were born swiftly -- Implications of the top-heavy stellar initial mass function on the birth conditions of globular clusters
论文作者
论文摘要
最近的结果表明，球状簇（GC）的初始质量函数（IMF）是金属性和密度依赖性的。在这里研究了这种变异如何影响最初的质量和核心塌陷超新星（CCSNE）的数量，以重现GC中观察到的铁扩散。与以前计算出的不变的规范IMF相比，所有研究的GC的IMF都表明了最大的初始质量。这导致需要更多的CCSNE来解释观察到的铁丰度扩展。结果表明，在较小的中心半径上形成的较大的GC可能表明人口II光环的原位形成。在原始GC内结束的星形形成（SF）的时间被计算为3.5-4 MYR，比使用规范IMF获得的4个MYR稍短。因此，IMF对SF持续时间很小的时间的影响。
Recent results suggest that the initial mass function (IMF) of globular clusters (GCs) is metallicity and density dependent. Here it is studied how this variation affects the initial masses and the numbers of core collapse supernovae (CCSNe) required to reproduce the observed iron spreads in GCs. The IMFs of all of the investigated GCs were top-heavy implying larger initial masses compared to previous results computed assuming an invariant canonical IMF. This leads to more CCSNe being required to explain the observed iron abundance spreads. The results imply that the more massive GCs formed at smaller Galactocentric radii, possibly suggesting in-situ formation of the population II halo. The time until star formation (SF) ended within a proto-GC is computed to be 3.5 - 4 Myr, being slightly shorter than the 4 Myr obtained using the canonical IMF. Therefore, the impact of the IMF on the time for which SF lasts is small.
