Subgalactic Scaling Relations with T e-based Metallicities of Low-metallicity Regions in Galaxies: Metal-poor Gas Inflow May Have Important Effects?

被引：4

作者：

Yao, Yao ^{[1
,2
]}

Liu, Haiyang ^{[1
,2
]}

Kong, Xu ^{[1
,2
]}

Gao, Yulong ^{[3
,4
]}

Chen, Guangwen ^{[1
,2
]}

Chen, Xinkai ^{[1
,2
]}

Liang, Zhixiong ^{[1
,2
]}

Lin, Zesen ^{[1
,2
]}

Tang, Yimeng ^{[1
,2
]}

Zhang, Hong-Xin ^{[1
,2
]}

机构：

[1] Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China

[2] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China

[3] Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China

[4] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 926卷 / 01期

基金：

美国安德鲁·梅隆基金会; 国家重点研发计划;

关键词：

STAR-FORMING GALAXIES; ELECTRON TEMPERATURES; CHEMICAL-COMPOSITION; NEARBY GALAXIES; STELLAR; MASS; EMISSION; SDSS; EVOLUTION; PIPELINE;

D O I：

10.3847/1538-4357/ac3b55

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The scaling relationship is a fundamental probe of the evolution of galaxies. Using the integral field spectroscopic data from the Mapping Nearby Galaxies at Apache Point Observatory survey, we select 1698 spaxels with a significant detection of the auroral emission line [O iii]lambda 4363 from 52 galaxies to investigate the scaling relationships at the low-metallicity end. We find that our sample's star formation rate is higher and its metallicity is lower in the scaling relationship than the star-forming sequence after removing the contribution of the Fundamental Metallicity Relation. We also find that the stellar ages of our sample are younger (<1 Gyr) and the stellar metallicities are also lower. Morphological parameters from the Deep Learning catalog indicate that our galaxies are more likely to be mergers. These results suggest that their low-metallicity regions may be related to interaction; the inflow of metal-poor gas may dilute the interstellar medium and form new metal-poor stars in these galaxies during interactions.

引用

页数：17