Peekaboo: the extremely metal poor dwarf galaxy HIPASS J1131-31

Author:

Karachentsev I D1,Makarova L N1ORCID,Koribalski B S2345ORCID,Anand G S6ORCID,Tully R B7,Kniazev A Y8910

Affiliation:

1. Special Astrophysical Observatory of the Russian Academy of Sciences , Nizhnij Arkhyz, Karachay-Cherkessia 369167, Russia

2. Australia Telescope National Facility , , PO Box 76, Epping, NSW 1710, Australia

3. CSIRO Astronomy and Space Science , , PO Box 76, Epping, NSW 1710, Australia

4. School of Science , , Locked Bag 1797, Penrith, NSW 2751, Australia

5. Western Sydney University , , Locked Bag 1797, Penrith, NSW 2751, Australia

6. Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA

7. Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu, HI 96822, USA

8. South African Astronomical Observatory , PO Box 9, 7935 Observatory, Cape Town, South Africa

9. Southern African Large Telescope Foundation , PO Box 9, 7935 Observatory, Cape Town, South Africa

10. Sternberg Astronomical Institute, Lomonosov Moscow State University , Universitetsky prospekt 13, 119992 Moscow, Russia

Abstract

ABSTRACT The dwarf irregular galaxy HIPASS J1131-31 was discovered as a source of HI emission at low redshift in such close proximity of a bright star that we call it Peekaboo. The galaxy resolves into stars in images with Hubble Space Telescope, leading to a distance estimate of 6.8 ± 0.7 Mpc. Spectral optical observations with the Southern African Large Telescope reveal HIPASS J1131-31 to be one of the most extremely metal-poor galaxies known with the gas-phase oxygen abundance 12 + log(O/H)  = 6.99 ± 0.16 dex via the direct [O iii] 4363 line method and 6.87 ± 0.07 dex from the two strong line empirical methods. The red giant branch of the system is tenuous compared with the prominence of the features of young populations in the colour-magnitude diagram, inviting speculation that star formation in the galaxy only began in the last few Gyr.

Funder

NASA

ESA

National Research Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 6 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3