Stellar Populations in Local Star‐forming Galaxies
Stellar Populations in Local Star‐forming Galaxies
复制标题
本地恒星形成星系中的恒星种群
DOI：
10.1086/379747
复制
发表时间：
2003
影响因子：
3.5
通讯作者：
P. Pérez
中科院分区：
文献类型：
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作者：
P. Pérez
我们介绍了马德里大学(UCM)巡天星系中恒星群的综合性质。基于样本可用的大量数据集--包括大量的光度和光谱观测--我们得出了样本星系中新形成恒星的年龄、爆发质量和金属丰度。年轻恒星的数量是用于探测UCM调查中的天体的Ha发射的原因。我们还考虑到每个星系的演化历史，以一致的方式推断总恒星质量和恒星形成率。我们发现，一个普通的UCM星系的总质量约为1010m⊙，其中约5%是在5Myr前的一次瞬时爆发中形成的，并且具有亚太阳金属丰度。只有不到10%的样本显示了巨大的恒星爆发，涉及星系总质量的一半以上。在派生的属性之间发现了几个相关性。对于低遮蔽度的星系，爆发强度与消光和积分光学颜色相关。目前的恒星形成率与气体含量有关。还发现了恒星质量与金属丰度的关系。我们的分析表明，UCM调查的星系在性质上跨越了广泛的范围，介于完全由当前/最近恒星形成主导的星系和正常静止的螺旋星系之间。我们还发现证据表明，在局部宇宙中恒星的形成是由质量比L小得多的星系主导的。
We present the integrated properties of the stellar populations in the Universidad Complutense de Madrid (UCM) Survey galaxies. Based on the extensive dataset available for the sample -which comprises a great deal of observations, both photometric and spectroscopic-, we have derived ages, burst masses and metallicities of the newly-formed stars in our sample galaxies. The population of young stars is responsible for the Ha emission used to detect the objects in the UCM Survey. We also infer total stellar masses and star formation rates in a consistent way taking into account the evolutionary history of each galaxy. We find that an average UCM galaxy has a total stellar mass of ~ 1010M⊙, of which about 5% has been formed in an instantaneous burst occurred about 5 Myr ago, and sub-solar metallicity. Less than 10% of the sample shows massive starbursts involving more than half of the total mass of the galaxy. Several correlations are found among the derived properties. The burst strength is correlated with the extinction and with the integrated optical colours for galaxies with low obscuration. The current star formation rate is correlated with the gas content. A stellar mass-metallicity relation is also found. Our analysis indicates that the UCM Survey galaxies span a broad range in properties between those of galaxies completely dominated by current/recent star formation and those of normal quiescent spirals. We also find evidence indicating that star-formation in the local universe is dominated by galaxies considerably less massive than L*.
Hilbert函数和参数系数的研究II
DOI：
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发表时间：
2010
期刊：
影响因子：
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作者：
S.Goto;F.Hayasaka;and R.Takahashi;後藤四郎;後藤四郎;後藤四郎
通讯作者：
後藤四郎
诺丁汉大学（英国）
DOI：
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