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arXiv 0809.2112astro-ph
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未分辨恒星星族星系的近红外光谱诊断

Near-Infrared spectral diagnostics for unresolved stellar population galaxies

M. Cesetti, V. D. Ivanov, L. Morelli

摘要:

我们希望在近红外(NIR)光谱诊断的恒星星族,未解决的恒星星族。我们创建了一个半经验的人口模型,我们比较了模型输出与观察到的光谱的一个样本的椭圆形和膨胀为主的星系,有可靠的舔指数从文献中测试,如果Mg 2和CO 1.62微米之间的相关性仍然有效的星系,并校准它作为一个丰度指标。我们发现:(i)任何近红外特征和光学Mg 2之间没有显着的相关性;(ii)CaI,NaI和CO跟踪α增强;(iii)近红外吸收特征不受星系年龄的影响。

英文摘要:

We want to develop spectral diagnostics of stellar populations in the near-infrared (NIR), for unresolved stellar populations. We created a semi-empirical population model and we compare the model output with the observed spectra of a sample of elliptical and bulge-dominated galaxies that have reliable Lick-indices from literature to test if the correlation between Mg2 and CO 1.62 micron remains valid in galaxies and to calibrate it as an abundance indicator. We find that (i) there are no significant correlations between any NIR feature and the optical Mg2; (ii) the CaI, NaI and CO trace the alpha-enhancement; and (iii) the NIR absorption features are not influenced by the galaxy's age.

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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