Stellar population constraints on the ages of galactic bars
Stellar population constraints on the ages of galactic bars
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DOI：
10.1093/mnras/stv2978
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发表时间：
2016-01
影响因子：
4.8
通讯作者：
P. James;S. Percival
中科院分区：
文献类型：
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作者：
P. James;S. Percival
© 2016作者由牛津大学出版社代表皇家天文学会出版。我们提出了一个研究的恒星人口的中心区域附近的四个酒吧星系，并使用一种新的技术来限制酒吧活动的持续时间。我们专注于星星形成的“沙漠”，在这些星系中的每一个区域，星星的形成似乎已被酒吧抑制。新的Hs光谱数据，并用于产生光谱线指数进行比较，从人口合成模型的理论预测简单的恒星人口和时间截断星星形成的历史。这一分析表明，在这些地区的星星形成活动的缺乏似乎已经持续了至少1个Gyr，与时间尺度的几个Gyr表示的两个星系。这有利于模型中，强大的酒吧可以是长寿的星系功能，但我们的研究结果也表明了显着的多样性，在恒星人口年龄，因此在这四个星系酒吧活动的隐含历史。
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. We present a study of the stellar populations within the central regions of four nearby barred galaxies, and use a novel technique to constrain the duration of bar activity. We focus on the star formation 'desert', a region within each of these galaxies where star formation appears to have been suppressed by the bar. New Hs spectroscopic data are presented, and used to produce spectroscopic line indices which are compared with theoretical predictions from population synthesis models for simple stellar populations and temporally truncated star formation histories. This analysis shows that the dearth of star formation activity in these regions appears to have been continuing for at least 1 Gyr, with time-scales of several Gyr indicated for two of the galaxies. This favours models in which strong bars can be long-lived features of galaxies, but our results also indicate a significant diversity in stellar population ages, and hence in the implied histories of bar activity in these four galaxies.