Peekaboo: the extremely metal poor dwarf galaxy HIPASS J1131-31
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 [OIII] 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 color-magnitude diagram, inviting speculation that star formation in the galaxy only began in the last few Gyr.
Keywords
Cite
@article{arxiv.2212.03478,
title = {Peekaboo: the extremely metal poor dwarf galaxy HIPASS J1131-31},
author = {I. D. Karachentsev and L. N. Makarova and B. S. Koribalski and G. S. Anand and R. B. Tully and A. Y. Kniazev},
journal= {arXiv preprint arXiv:2212.03478},
year = {2022}
}
Comments
11 pages, 7 figures, published in MNRAS