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

I. D. Karachentsev, L. N. Makarova, B. S. Koribalski, G. S. Anand, R. B. Tully, A. Y. Kniazev

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)5893-5903
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume518
Issue number4
Publication statusPublished - 1 Feb 2023

Bibliographical note

Publisher Copyright:
© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.

Keywords

  • galaxies: dwarf
  • galaxies: irregular
  • galaxies: star formation
  • galaxies: individual: HIPASS J1131-31

Fingerprint

Dive into the research topics of 'Peekaboo : the extremely metal poor dwarf galaxy HIPASS J1131-31'. Together they form a unique fingerprint.

Cite this