常见的恒星质量和恒星形成率计算方法之间的对比*

doi:10.7523/j.ucas.2022.052

中国科学院大学学报

常见的恒星质量和恒星形成率计算方法之间的对比^*

李翠环^1,2, 李国栋^2,3, 蔡肇伟^3,4†, 单增罗布^1‡

1 西藏大学宇宙线教育部重点实验室,拉萨 850000;
2 中国科学院国家天文台,北京 100101;
3 中国科学院大学,北京 100049;
4 中国科学院FAST重点实验室,北京 100101

收稿日期:2022-03-07 修回日期:2022-05-06 发布日期:2022-05-12
通讯作者: † Email: cwtsai@nao.ac.cn; ‡ Email: dzlb@uTibet.edu.cn
基金资助:
* 国家自然科学基金（12041302; 11973051）资助

Comparisons among common methods of calculating stellar masses and star formation rates for normal galaxies

LI Cuihuan^1,2, LI Guodong^2,3, TSAI Chaowei^3,4, DANZENG Luobu¹

1 Key Laboratory of Cosmic Rays, Ministry of Education, Tibet University, Lhasa 850000, China;
2 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China;
4 CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China

Received:2022-03-07 Revised:2022-05-06 Published:2022-05-12

摘要/Abstract

摘要： 恒星质量与恒星形成率是星系的重要内禀性质,因此也是在宇宙时间尺度上了解重子物质在星系尺度上分布演化的重要依据。对于单一星系的恒星质量和恒星形成率,天文学家们根据多波段的数据提出了多种估算方式。本文针对斯隆数字巡天计划中有测光及光谱认证的正常星系的样本,利用天文多波段巡天数据,分别使用恒星质量和恒星形成率的数种不同计算方法,从原理到结果进行相互对比。本研究结果发现,不同的恒星质量估算方法的结果相互差异并不显著,然而恒星形成率的不同方法之间存在不同程度且重要的误差。因此,在对星系间恒星形成率进行相互比较,或是研究星系演化时的恒星形成率分析时,应使用相类似的观测数据资料,以及同一种恒星形成率估算方式,避免不同估算方式的偏差造成的错误解读。

关键词: 星系, 恒星质量, 恒星形成率

Abstract: Stellar mass and star formation rate are essential properties of galaxies. They are also an important basis for understanding the evolution of baryonic matter distribution on the cosmic time scale. Astronomers have developed many methods to estimate the stellar mass and star formation rate of a single galaxy using multi-waveband data. This paper evaluates the variations of the results from different stellar mass and star formation rate estimation methods using multi-wavelength sky survey data of a sample of normal galaxies from the Salon Digital Sky Survey. Our study shows that the results of various stellar mass estimation methods are not significantly different. However, the degree of deviation between the estimated star formation rates from different methods is significant and critical. Therefore, to avoid inaccurate interpretation caused by the discrepancy of different estimation methods, a similar observation data set and the same star formation rate estimation method should be used for each galaxy when comparing star formation rates between galaxies or analyzing star formation rates of a large galaxy sample.

Key words: galaxies, stellar mass, star formation rate

中图分类号:

P157.9

李翠环, 李国栋, 蔡肇伟, 单增罗布. 常见的恒星质量和恒星形成率计算方法之间的对比^*[J]. 中国科学院大学学报, DOI: 10.7523/j.ucas.2022.052.

LI Cuihuan, LI Guodong, TSAI Chaowei, DANZENG Luobu. Comparisons among common methods of calculating stellar masses and star formation rates for normal galaxies[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2022.052.

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常见的恒星质量和恒星形成率计算方法之间的对比^*

Comparisons among common methods of calculating stellar masses and star formation rates for normal galaxies

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