MMT extremely metal-poor galaxy survey I. An efficient technique for identifying metal-poor galaxies

被引：34

作者：

Brown, Warren R. ^{[1
]}

Kewley, Lisa J. ^{[2
]}

Geller, Margaret J. ^{[1
]}

机构：

[1] Smithsonian Astrophys Observ, Cambridge, MA 02138 USA

[2] Univ Hawaii, Honolulu, HI 96822 USA

来源：

ASTRONOMICAL JOURNAL | 2008年 / 135卷 / 01期

关键词：

galaxies : abundances; galaxies : starburst; gamma rays : bursts;

D O I：

10.1088/0004-6256/135/1/92

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We demonstrate a successful strategy for identifying extremely metal-poor galaxies. Our preliminary survey of 24 candidates contains 10 metal-poor galaxies of which 4 have log(O/H)+12 < 7.65, some of the lowest-metallicity blue compact galaxies known to date. Interestingly, our sample of metal-poor galaxies have systematically lower metallicity for their luminosity than comparable samples of blue compact galaxies, dwarf irregulars, and normal star-forming galaxies. Our metal-poor galaxies share very similar properties, however, with the host galaxies of nearby long-duration gamma-ray bursts (GRBs), including similar metallicity, stellar ages, and star formation rates. We use H beta to measure the number of OB stars present in our galaxies and estimate a core-collapse supernova rate of similar to 10(-3) yr(-1). A larger sample of metal-poor galaxies may provide new clues about the environment where GRBs form and may provide a list of potential GRB hosts.

引用

页码：92 / 98

页数：7

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