从星系的综合光谱中计算恒星数量

IF 5.4 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astronomy & Astrophysics Pub Date : 2024-11-08 DOI:10.1051/0004-6361/202451604
I. Martín-Navarro, A. Vazdekis
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引用次数: 0

摘要

在过去的几十年里,演化种群合成模型为我们了解星系提供了无与伦比的飞跃。从确定宇宙中第一批星系的年龄,到提供附近星系化学成分的详细测量结果,这种建立在简单恒星群(SSP)光谱-光度模型基础上的方法所取得的成功是毋庸置疑的。然而,在 SSP 假设不充分成立的情况下,构建 SSP 模型所固有的内部约束会阻碍我们分析星系综合光谱的能力。因此,我们在这里重新探讨了将星系光谱拟合为恒星模板线性组合的可能性,而不假定任何关于恒星演化的先验知识。我们展示了这种替代方法对恒星群特性变化的敏感性,特别是与恒星初始质量函数变化的直接联系,以及它在处理非经典综合恒星群和半分辨观测时的优势。此外,我们的分析表明,星系的吸收光谱可以用来独立地约束恒星演化理论,而不局限于太阳附近的有限条件。
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Counting stars from the integrated spectra of galaxies
Over the last few decades, evolutionary population synthesis models have powered an unmatched leap forward in our understanding of galaxies. From dating the age of the first galaxies in the Universe to providing detailed measurements of the chemical composition of nearby galaxies, the success of this approach built upon simple stellar population (SSP) spectro-photometric models is unquestionable. However, the internal constraints inherent to the construction of SSP models can hinder our ability to analyze the integrated spectra of galaxies in situations where the SSP assumption does not sufficiently hold. Thus, here we revisit the possibilities of fitting galaxy spectra as a linear combination of stellar templates without assuming any a priori knowledge on stellar evolution. We showcase the sensitivity of this alternative approach to changes in the stellar population properties, in particular the direct connection to variations in the stellar initial mass function, as well as its advantages when dealing with noncanonical integrated populations and semi-resolved observations. Furthermore, our analysis demonstrates that the absorption spectra of galaxies can be used to independently constrain stellar evolution theory beyond the limited conditions of the solar neighborhood.
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来源期刊
Astronomy & Astrophysics
Astronomy & Astrophysics 地学天文-天文与天体物理
CiteScore
10.20
自引率
27.70%
发文量
2105
审稿时长
1-2 weeks
期刊介绍: Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.
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