Constraints on the Origin of Manganese from the Composition of the Sagittarius Dwarf Spheroidal Galaxy and the Galactic Bulge

Constraints on the Origin of Manganese from the Composition of the Sagittarius Dwarf Spheroidal Galaxy and the Galactic Bulge
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人马座矮球状星系和银河核球成分对锰成因的制约

DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
T. Smecker
T. Smecker
中科院分区：
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文献类型：
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作者：
A. McWilliam;R. Rich;T. Smecker

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银河系球核中[Mn/Fe]的变化趋势与太阳近邻关系一致，但人马座矮球状星系中的大多数恒星都表现出[Mn/Fe]的亏损，亏损幅度约为0.2 dex。这使我们得出结论，从Ia型和II型超新星（SNe）的锰产量是金属丰度依赖。我们的观察结果与格拉顿提出的观点相反，即相对于II型SNe，Ia型SNe过量产生锰。我们预测Mn/Fe比，低于太阳附近的关系，几乎所有的矮星系的年轻人口，Mn/Fe比可能是有用的跟踪吸积的低质量卫星进入银河系。
The trend of [Mn/Fe] in the Galactic bulge follows the solar neighborhood relation, but most stars in the Sagittarius dwarf spheroidal galaxy show [Mn/Fe] deficient by ~0.2 dex. This leads us to conclude that the Mn yields from both Type Ia and Type II supernovae (SNe) are metallicity dependent. Our observations militate against the idea, suggested by Gratton, that Mn is overproduced by Type Ia SNe, relative to Type II SNe. We predict Mn/Fe ratios, lower than the solar neighborhood relation, for the younger populations of nearly all dwarf galaxies, and that Mn/Fe ratios may be useful for tracing the accretion of low-mass satellites into the Milky Way.