Near-infrared spectroscopic indices for unresolved stellar populations
Near-infrared spectroscopic indices for unresolved stellar populations
复制标题
未解析恒星群的近红外光谱指数
DOI：
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发表时间：
2018
影响因子：
6.5
通讯作者：
E. Bontà
中科院分区：
文献类型：
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作者：
P. François;L. Morelli;A. Pizzella;V. D. Ivanov;L. Coccato;M. Cesetti;E. Corsini;E. Bontà
上下文近年来，新一代的光谱合成模型已经开发出来，但在质量和分辨率方面，没有匹配的模板星系光谱集来测试和改进新模型。
目标。我们的主要目标是找到和校准新的近红外光谱指数沿着哈勃序列的星系，这将被用来获得额外的限制人口分析的基础上，中分辨率的综合光谱的星系。
方法.以前研究和充分理解的星系光谱相对简单的恒星种群（例如，椭圆星系或凸出主导星系）需要为光谱合成模型提供基线数据集。
结果获得了附近明亮椭圆星系的X射线光谱，其分辨率为R 4000-5400，跨越了光学和红外波长（350-2400 nm）。 给出了日心系统速度、速度频散、Mg、Fe和Hβ谱线强度指数。
结论.我们提出了一个非常高质量的星系光谱库，涵盖了大范围的年龄，金属丰度和形态类型。这样的光谱数据集对于解决现代研究中有关星系形成和演化的重要问题至关重要。
Context. A new generation of spectral synthesis models has been developed in recent years, but there is no matching set of template galaxy spectra, in terms of quality and resolution, for testing and refining the new models.
Aims. Our main goal is to find and calibrate new near-infrared spectral indices along the Hubble sequence of galaxies which will be used to obtain additional constraints to the population analysis based on medium-resolution integrated spectra of galaxies.
Methods. Spectra of previously studied and well-understood galaxies with relatively simple stellar populations (e.g., ellipticals or bulge dominated galaxies) are needed to provide a baseline data set for spectral synthesis models.
Results. X-shooter spectra spanning the optical and infrared wavelengths (350–2400 nm) of bright nearby elliptical galaxies with a resolving power of R ∼ 4000–5400 were obtained. Heliocentric systemic velocity, velocity dispersion, and Mg, Fe, and Hβ line-strength indices are presented.
Conclusions. We present a library of very-high-quality spectra of galaxies covering a large range of age, metallicity, and morphological type. Such a dataset of spectra will be crucial to addressing important questions of the modern investigation concerning galaxy formation and evolution.