Outliers from the mass-metallicity relation. I. A sample of metal-rich dwarf galaxies from SDSS

被引：42

作者：

Peeples, Molly S. ^{[1
]}

Pogge, Richard W. ^{[1
]}

Stanek, K. Z. ^{[1
]}

机构：

[1] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 685卷 / 02期

基金：

巴西圣保罗研究基金会;

关键词：

galaxies : abundances; galaxies : dwarf; galaxies : evolution;

D O I：

10.1086/591492

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have identified a sample of 41 low-mass high-oxygen abundance outliers from the mass-metallicity relation of star-forming galaxies measured by Tremonti et al. (2004). These galaxies, which have 8.6 < 12 + log(O/H) < 9.3 over a range of -14.4 > M-B > -19.1 and 7.4 < log(M-*/M-circle dot) < 10, are surprisingly nonpathological. They have typical specific star formation rates, are fairly isolated, and, with few exceptions, have no obvious companions. Morphologically, they are similar to dwarf spheroidal or dwarf elliptical galaxies. We predict that their observed high oxygen abundances are due to relatively low gas fractions, concluding that these are transitional dwarf galaxies nearing the end of their star formation activity.

引用

页码：904 / 914

页数：11

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