On the Metallicity of Star-forming Dwarf Galaxies
On the Metallicity of Star-forming Dwarf Galaxies
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关于恒星形成矮星系的金属丰度
DOI：
10.1086/322960
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Cerviño
中科院分区：
文献类型：
--
作者：
F. Legrand;G. Tenorio;S. Silich;D. Kunth;M. Cerviño
我们构建了三个非常不同的方案适用于一个样本的矮星系的星星形成的历史，根据其目前的金属丰度或光度。这三种可能的情况意味着不同的机械能输入率，这些我们比较的理论下限成立的处理后的物质喷射出矮星系。这种比较强烈地指出，在这些星系中存在着扩展的气体晕，它们作为屏障，使星系能够保留它们的金属并增加它们的丰度。与此同时，我们的发现强烈地指向一个连续的恒星形成过程，而不是同时代的爆发，作为我们星系样本中整体金属丰度的主要贡献者。
We construct three extremely different scenarios of the star formation histories applicable to a sample of dwarf galaxies, based on either their present metallicity or their luminosity. The three possible scenarios imply different mechanical energy input rates, and these we compare with the theoretical lower limits established for the ejection of processed matter out of dwarf galaxies. The comparison strongly points to the existence of extended gaseous halos in these galaxies acting as the barrier that allows galaxies to retain their metals and enhance their abundance. At the same time, our findings strongly point to a continuous star-forming process, rather than to coeval bursts, as the main contributor to the overall metallicity in our galaxy sample.