The APOGEE Library of Infrared SSP Templates (A-LIST): High-resolution Simple Stellar Population Spectral Models in the H Band
The APOGEE Library of Infrared SSP Templates (A-LIST): High-resolution Simple Stellar Population Spectral Models in the H Band
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DOI：
10.3847/1538-3881/abd7f1
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发表时间：
2020-12
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通讯作者：
Aishwarya Ashok;G. Zasowski;A. Seth;S. Hasselquist;Galen J. Bergsten;Olivia R. Cooper;N. Boardman;D. Bizyaev;Sofia Meneses Goytia;D. A. García-Hernández;A. Roman-Lopes
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作者：
Aishwarya Ashok;G. Zasowski;A. Seth;S. Hasselquist;Galen J. Bergsten;Olivia R. Cooper;N. Boardman;D. Bizyaev;Sofia Meneses Goytia;D. A. García-Hernández;A. Roman-Lopes
来自星系的综合光谱学可以用来研究无法分解成单个恒星的恒星群。这种分析依赖于恒星人口合成（SPS）技术来研究星系的形成历史和结构。然而，可用于SPS的光谱模板是有限的，特别是在近红外（near-IR）。A-LIST（APOGEE Library of Infrared SSP Templates）是一套新的高分辨率近红外SSP光谱模板，涵盖广泛的年龄（2-12 Gyr），金属丰度（− 2.2 < [M/H] < + 0.4）和α丰度（− 0.2 < [α/M] < + 0.4）。这组SSP模板是近红外光谱中可用的最高分辨率（R = 22，500），也是第一个基于经验恒星库的模板。我们的模型是使用分布在银河系中的300，000颗恒星的光谱生成的，这些恒星具有广泛的金属丰度和丰度，来自APOGEE调查。我们发现，我们的模型光谱提供了准确的拟合M31球状星团光谱与APOGEE，最佳拟合金属丰度同意与以前的估计在10.1德克斯。我们还将这些模型光谱与较低分辨率的E-MILES模型进行了比较，并证明我们将这些模型的年龄恢复到± 1.5 Gyr以内。这个库可以在https://github.com/aishashok/ALIST-library上找到。
Integrated light spectroscopy from galaxies can be used to study the stellar populations that cannot be resolved into individual stars. This analysis relies on stellar population synthesis (SPS) techniques to study the formation history and structure of galaxies. However, the spectral templates available for SPS are limited, especially in the near-infrared (near-IR). We present A-LIST (APOGEE Library of Infrared SSP Templates), a new set of high-resolution, near-IR SSP spectral templates spanning a wide range of ages (2–12 Gyr), metallicities ( − 2.2 < [M/H] < + 0.4) and α abundances ( − 0.2 < [α/M] < + 0.4). This set of SSP templates is the highest resolution (R ∼ 22, 500) available in the near-IR, and the first such based on an empirical stellar library. Our models are generated using spectra of ∼300,000 stars spread across the Milky Way, with a wide range of metallicities and abundances, from the APOGEE survey. We show that our model spectra provide accurate fits to M31 globular cluster spectra taken with APOGEE, with best-fit metallicities agreeing with those of previous estimates to within ∼0.1 dex. We also compare these model spectra to lower-resolution E-MILES models and demonstrate that we recover the ages of these models to within ∼1.5 Gyr. This library is available in https://github.com/aishashok/ALIST-library.