The physical properties of galaxies with unusually high gas-phase metallicity

• 作者: Qiu-Sheng Gu Xue Ge Yong-Yun Chen
• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2020,（2）
• 页码范围: 39-52
• 页数: 14页
• 语种: 英文
• DOI: 10.1088/1674-4527/20/2/20

摘要

We use 1221 galaxies with unusually high gas-phase metallicity to study their physical properties.The scope of redshift is 0.02 ＜ z ＜ 0.25 for these galaxies with unusually high gas-phase metallicity.Our goal is to understand the physical origins of the high gas-phase metallicity.To address this study,we select a control sample matching similar redshift and stellar mass.Our main results are as follows.(i) Compared with the control sample,the high-metallicity sample shows lower ionization parameter,higher electron density and more dust content.(ii) We also find that the high-metallicity sample has older stellar age and higher[Mgb/<Fe>]ratio,which indicates that the high-metallicity sample has shorter timescale of star formation.(iii) According to the plane of HδA vs.Dn4000,we can see that the control sample has higher HδA and lower Dn4000 than the high-metallicity sample,which may imply that the control sample experiences recent star formation.(iv) There is a significant difference in gas distribution between the high-metallicity and control samples.The high-metallicity sample has lower gas fraction than control sample,which indicates that galaxies have high gas-phase metallicity probably due to their low HI gas fraction.(v) There is no significant difference between the high-metallicity and control samples in environment,which may suggest that the environment has no effect on gas-phase metallicity.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	Yong-Yun Chen		1	0	0.0	0.0
2	Qiu-Sheng Gu		1	0	0.0	0.0
3	Xue Ge		1	0	0.0	0.0