The Hi-rich ultra-diffuse galaxies follow the extended Schmidt law

被引：2
作者：
Zhai, Sai [1 ,2 ]
Shi, Yong [1 ,2 ]
Zhang, Zhi-Yu [1 ,2 ]
Wang, Jun-Zhi [3 ,4 ]
Gao, Yu [5 ,6 ]
Gu, Qiusheng [1 ,2 ]
Wang, Tao [1 ,2 ]
Du, Kaiyi [1 ,2 ]
Yu, Xiaoling [1 ,2 ,7 ]
Li, Xin [1 ,2 ]
机构：
[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Peoples R China
[3] Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
[4] Guangxi Univ, Sch Phys Sci & Technol, Nanning 530004, Peoples R China
[5] Xiamen Univ, Dept Astron, Xiamen 361005, Peoples R China
[6] Chinese Acad Sci, Purple Mt Observ, 10 Yuanhua Rd, Nanjing 210023, Peoples R China
[7] Qujing Normal Univ, Coll Phys & Elect Engn, Qujing 655011, Peoples R China
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 527卷 / 02期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
galaxies: dwarf; galaxies: evolution; galaxies: star formation; STAR-FORMATION RATES; MULTIPHASE GALACTIC DISKS; EXISTING STARS; MASS FUNCTION; DARK-MATTER; ULTRAVIOLET; FEEDBACK;
D O I：
10.1093/mnras/stad3424
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The -rich ultra-diffuse galaxies (HUDGs) offer a unique case for studies of star formation laws as they host low star formation efficiency and low-metallicity environments where gas is predominantly atomic. We collect a sample of six HUDGs in the field and investigate their location in the extended Schmidt law (Sigma(SFR) alpha (Sigma(0.5)(star) Sigma(gas))(1.09)). They are consistent with this relationship well (with deviations of only 1.1 sigma). Furthermore, we find that HUDGs follow the tight correlation between the hydrostatic pressure in the galaxy mid-plane and the quantity on the x-axis (log (Sigma(0.5)(star) Sigma(gas)) of the extended Schmidt law. This result indicates that these HUDGs can be self-regulated systems that reach the dynamical and thermal equilibrium. In this framework, the stellar gravity compresses the disc vertically and counteracts the gas pressure in the galaxy mid-plane to regulate the star formation as suggested by some theoretical models.
引用
收藏
页码：2691 / 2696
页数：6
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