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arXiv 1004.0684astro-ph.CO
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关于棒旋星系的分数

On the Fraction of Barred Spiral Galaxies

Preethi B. Nair, Roberto G. Abraham

摘要:

我们研究了强棒旋星系的恒星质量。我们的分析是基于Nair & Abraham 2010(a)中给出的~14000个视觉分类的邻近星系的样本。发现棒旋星系的比例是恒星质量和恒星形成历史的强函数,在特征质量附近有一个最小值,在该质量处,星系的恒星星族中出现双峰。我们还发现棒分数对过渡质量以下的星系中心浓度非常敏感,但对过渡质量以上的星系中心浓度却不敏感,这表明,无论是什么过程导致了红色和蓝色序列的产生,都在影响结构变化,或者受到结构变化的影响,而结构变化在没有棒的情况下表现出来。作为一个后果的强酒吧分数被探测的质量范围敏感,我们的分析有助于解决不一致的结果与红移的酒吧分数的演变报告。

英文摘要:

We investigate the stellar masses of strongly barred spiral galaxies. Our analysis is based on a sample of ~14000 visually-classified nearby galaxies given in Nair & Abraham 2010(a). The fraction of barred spiral galaxies is found to be a strong function of stellar mass and star formation history, with a minimum near the characteristic mass at which bimodality is seen in the stellar populations of galaxies. We also find bar fractions are very sensitive to the central concentration of galaxies below the transition mass but not above it. This suggests that whatever process is causing the creation of the red and blue sequences is either influencing, or being influenced by, structural changes which manifest themselves in the absence of bars. As a consequence of strong bar fractions being sensitive to the mass range probed, our analysis helps resolve discrepant results on the reported evolution of bar fractions with redshift.

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