Clues to the origin of the mass-metallicity relation: Dependence on star formation rate and galaxy size

被引：267
|
作者：
Ellison, Sara L. [1 ]
Patton, David R. [2 ]
Simard, Luc [3 ]
McConnachie, Alan W. [1 ]
机构：
[1] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada
[2] Trent Univ, Dept Phys & Astron, Peterborough, ON K9J 7B8, Canada
[3] Natl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9E 2E7, Canada
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 672卷 / 02期
基金：
加拿大自然科学与工程研究理事会;
关键词：
galaxies : abundances; galaxies : ISM;
D O I：
10.1086/527296
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We use a sample of 43,690 galaxies selected from the Sloan Digital Sky Survey Data Release 4 to study the systematic effects of specific star formation rate (SSFR) and galaxy size ( as measured by the half-light radius, r(h)) on the mass-metallicity relation. We find that galaxies with high SSFR or large r(h) for their stellar mass have systematically lower gas-phase metallicities (by up to 0.2 dex) than galaxies with low SSFR or small r(h). We discuss possible origins for these dependencies, including galactic winds/ outflows, abundance gradients, environment, and star formation rate efficiencies.
引用
收藏
页码：L107 / L110
页数：4
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