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arXiv 1310.3255astro-ph.CO
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早型半导体的UV色与恒星初始质量函数之间的经验联系

An Empirical Connection between the UV Color of Early Type Galaxies and the Stellar Initial Mass Function

Dennis Zaritsky, Armando Gil de Paz, Alexandre Y. K. Bouquin

摘要:

使用新的UV星等的样本早期型星系,ETG,与公布的恒星质量-光比,Upgradation_*,我们发现的UV颜色和Upgradation_* 之间的相关性比以前确定的Upgradation_* 和中央恒星速度色散,金属丰度,或α增强。这种相关性的意义是,具有较大Upperdance_* 的星系在紫外线下更蓝。我们推测,在恒星初始质量函数,IMF的低质量端的差异,是相关的极端水平分支人口的性质,一般负责的紫外线通量在ETG。如果是这样,则UV颜色可以用于识别具有特定IMF属性的ETG并估计Upgradient_*。

英文摘要:

Using new UV magnitudes for a sample of early-type galaxies, ETGs, with published stellar mass-to-light ratios, Upsilon_*, we find a correlation between UV color and Upsilon_* that is tighter than those previously identified between Upsilon_* and either the central stellar velocity dispersion, metallicity, or alpha enhancement. The sense of the correlation is that galaxies with larger Upsilon_* are bluer in the UV. We conjecture that differences in the lower mass end of the stellar initial mass function, IMF, are related to the nature of the extreme horizontal branch populations that are generally responsible for the UV flux in ETGs. If so, then UV color can be used to identify ETGs with particular IMF properties and to estimate Upsilon_*.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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