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首页> 外文期刊>The Astrophysical Journal. Letters >Chemical abundance evidence of enduring high star formation rates in an early-type galaxy: High [Ca/Fe] in NGC 5128 globular clusters
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Chemical abundance evidence of enduring high star formation rates in an early-type galaxy: High [Ca/Fe] in NGC 5128 globular clusters

机译：在早期型星系中持久存在高恒星形成率的化学丰度证据：NGC 5128球状星团中高[Ca / Fe]

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摘要

We present [Fe/H], ages, and Ca abundances for an initial sample of 10 globular clusters in NGC 5128 obtained from high-resolution, high signal-to-noise ratio echelle spectra of their integrated light. All abundances and ages are obtained using our original technique for high-resolution integrated light abundance analysis of globular clusters. The clusters have a range in [Fe/H] between -1.6 and -0.2. In this sample, the average [Ca/Fe] for clusters with [Fe/H] <-0.4 is +0.37 ± 0.07, while the average [Ca/Fe] in our Milky Way (MW) and M31 GC samples is +0.29 ± 0.09 and +0.24 ± 0.10, respectively. This may imply a more rapid chemical enrichment history for NGC 5128 than for either the MW or M31. This sample provides the first quantitative picture of the chemical history of NGC 5128 that is directly comparable to what is available for the MW. Data presented here were obtained with the MIKE echelle spectrograph on the Magellan Clay Telescope.
机译：我们展示了NGC 5128中10个球状星团的初始样本的[Fe / H]，年龄和Ca丰度，这些样本是从它们的集成光的高分辨率，高信噪比阶梯光谱获得的。所有丰度和年龄均使用我们的原始技术获得，用于球状星团的高分辨率集成光丰度分析。簇的[Fe / H]范围在-1.6和-0.2之间。在此样本中，[Fe / H] <-0.4的簇的平均[Ca / Fe]为+0.37±0.07，而我们的银河系（MW）和M31 GC样本的平均[Ca / Fe]为+0.29 ±0.09和+0.24±0.10。这可能意味着与MW或M31相比，NGC 5128的化学富集历史更快。该样品提供了NGC 5128的化学历史的第一张定量图片，可直接用于MW。此处提供的数据是通过麦哲伦粘土望远镜上的MIKE阶梯光谱仪获得的。

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