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

作　　者：李翠环 李国栋 蔡肇伟 单增罗布[1,2] LI Cuihuan;LI Guodong;TSAI Chao-Wei;DANZENG Luobu(Department of physics,College of Science,Tibet University,Lhasa 850000,China;Key Laboratory of Cosmic Rays of Ministry of Education,Tibet University,Lhasa 850000,China;National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;CAS Key Laboratory of FAST,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]西藏大学理学院物理系,拉萨850000 [2]西藏大学宇宙线教育部重点实验室,拉萨850000 [3]中国科学院国家天文台,北京100101 [4]中国科学院大学,北京100049 [5]中国科学院国家天文台中国科学院FAST重点实验室,北京100101

出　　处：《中国科学院大学学报（中英文）》2024年第3期312-320,共9页Journal of University of Chinese Academy of Sciences

基　　金：国家自然科学基金(12041302,11973051)资助。

摘　　要：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(SFR)的数种不同计算方法,从原理到结果进行相互对比。研究发现,不同的恒星质量估算方法的结果相互差异并不显著,然而SFR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SFR进行相互比较,或是研究星系演化时的SFR分析时,应使用相类似的观测数据资料,以及同一种SFR估算方式,避免不同估算方式的偏差造成的错误解读。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.

关 键 词：星系 恒星质量 恒星形成率 星系演化 

分 类 号：P157.9[天文地球—天文学]