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Two categories of UV-upturn galaxies revealed by semi-analytic models

文献类型：期刊论文

作者Jiang, Zhen5,6; Li, Cheng6; Zhang FH(张奉辉)2,3,4; Zhou, Shuang1
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2025-07
卷号540期号:4页码:3770-3788
关键词binaries: general stars: horizontal branch galaxies: elliptical and lenticular ultraviolet: galaxies
ISSN号0035-8711
DOI10.1093/mnras/staf923
产权排序第3完成单位
文献子类Article
英文摘要UV-upturn galaxies are characterized by unusually excessive flux in the far-ultraviolet band, observed in some elliptical galaxies and the bulges of disc galaxies. We examine UV-upturn galaxies within the semi-analytic model GABE, which embeds the formation of extreme horizontal branch (EHB) stars-proposed as key candidates responsible for the UV-upturn phenomenon. We have analysed all related physical processes, including stellar evolution, initial mass functions (IMFs), dust attenuation, galaxy age, metallicity, and binary fractions, in an effort to determine which processes play significant roles. Our findings reveal two categories of UV-upturn galaxies in the semi-analytic model, each with distinct formation channels: old metal-rich quenched elliptical galaxies, which are intrinsic UV-upturn galaxies induced by EHB stars within their old stellar populations, and dusty star-forming galaxies, which are relatively young and may also be photometrically identified as UV-upturn galaxies when accounting for dust attenuation. Dust attenuation contributes to 20 per cent-60 per cent of the UV-upturn galaxies, depending on the specific dust attenuation models adopted. With the binary star formation model of EHB stars, both of these formation channels exhibit strong preferences for high stellar metallicity. The high-mass end slope of the IMFs is found to have a marginal effect, indicating that a universal IMF is adequate for studying the UV-upturn phenomenon.
学科主题天文学 ; 恒星与银河系 ; 星系与宇宙学
URL标识查看原文
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
WOS关键词EVOLUTIONARY POPULATION SYNTHESIS ; FAR-ULTRAVIOLET EMISSION ; COLOR-MAGNITUDE RELATIONS ; HORIZONTAL-BRANCH STARS ; MASS-RATIO DISTRIBUTION ; LUMINOUS RED GALAXIES ; DIGITAL SKY SURVEY ; SUBDWARF-B-STARS ; ELLIPTIC GALAXIES ; STELLAR POPULATIONS
资助项目National Key R&D Program of China[2022YFA1602902]; National Key R&D Program of China[12433003]; National Key R&D Program of China[11821303]; National Key R&D Program of China[11973030]; National Natural Science Foundation of China; China Manned Space Program through its Space Application System
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001515404900001
出版者OXFORD UNIV PRESS
资助机构National Key R&D Program of China[2022YFA1602902] ; National Key R&D Program of China[12433003, 11821303, 11973030] ; National Natural Science Foundation of China ; China Manned Space Program through its Space Application System
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28392]  
专题云南天文台_大样本恒星演化研究组
云南天文台_中国科学院天体结构与演化重点实验室
通讯作者Jiang, Zhen; Li, Cheng
作者单位1.INAF – Osservatorio Astronomico di Brera, via Brera, 28, I-20121 Milano, Italy
2.International Centre of Supernovae, Yunnan Key Laboratory, 396 Yangfangwang, Guandu District, Kunming 650216, China;
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China;
4.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China;
5.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, China;
6.Department of Astronomy, Tsinghua University, 1 Qinghuayuan, Haidian District, Beijing 100084, China;
推荐引用方式
GB/T 7714		 Jiang, Zhen,Li, Cheng,Zhang FH,et al. Two categories of UV-upturn galaxies revealed by semi-analytic models[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2025,540(4):3770-3788.
APA Jiang, Zhen,Li, Cheng,张奉辉,&Zhou, Shuang.(2025).Two categories of UV-upturn galaxies revealed by semi-analytic models.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,540(4),3770-3788.
MLA Jiang, Zhen,et al."Two categories of UV-upturn galaxies revealed by semi-analytic models".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 540.4(2025):3770-3788.

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来源：云南天文台

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