Peekaboo: the extremely metal poor dwarf galaxy HIPASS J1131-31
arXiv:2212.03478 · doi:10.1093/mnras/stac3284
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.
arXiv comment11 pages, 7 figures, published in MNRAS
References in corpus (37)
- Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
- PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
- The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
- WFPC2 Stellar Photometry with HSTphot
- HyperLEDA. III. The catalogue of extragalactic distances
- The GALEX Ultraviolet Atlas of Nearby Galaxies
- The Arecibo Legacy Fast ALFA Survey: The alpha.40 HI Source Catalog, its Characteristics and their Impact on the Derivation of the HI Mass Function
- The HIPASS Catalogue - I. Data Presentation
- The 1000 Brightest HIPASS Galaxies: HI Properties
- Tip of the Red Giant Branch Distances. II. Zero-Point Calibration
- Evolution of Thermally Pulsing Asymptotic Giant Branch Stars I. The COLIBRI Code
- New Lessons from the HI Size-Mass Relation of Galaxies
- First science with SALT: peering at the accreting polar caps of the eclipsing polar SDSS J015543.40+002807.2
- A Database of Cepheid Distance Moduli and TRGB, GCLF, PNLF and SBF Data Useful for Distance Determinations
- Strong Emission Line HII Galaxies in the Sloan Digital Sky Survey. I. Catalog of DR1 Objects with Oxygen Abundances from Te easurements
- Associations of Dwarf Galaxies
- ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo~P. III. An Extremely Metal Deficient Galaxy
- I Zw 18 revisited with HST/ACS and Cepheids: New Distance and Age
- Deep Hubble Space Telescope/ACS Observations of I Zw 18: a Young Galaxy in Formation
- Action Dynamics of the Local Supercluster
- J0811+4730: the most metal-poor star-forming dwarf galaxy known
- The Local Volume HI Survey (LVHIS)
- MMT observations of new extremely metal-poor emission-line galaxies in the Sloan Digital Sky Survey
- The Extragalactic Distance Database: The Color-Magnitude Diagrams and Tip of the Red Giant Branch Distances Catalog
- ALFALFA Discovery of the Most Metal-Poor Gas-Rich Galaxy Known: AGC 198691
- The metallicity extremes of the Sagittarius dSph using SALT spectroscopy of PNe
- An Ultra Compact Dwarf around the Sombrero galaxy (M104): the Nearest Massive UCD
- Low-redshift lowest-metallicity star-forming galaxies in the SDSS DR14
- The Leoncino Dwarf Galaxy: Exploring the Low-Metallicity End of the Luminosity-Metallicity and Mass-Metallcity Relations
- J2229+2725: an extremely low-metallicity dwarf compact star-forming galaxy with an exceptionally high [OIII]5007/[OII]3727 flux ratio of 53
- Pecular velocities of galaxies in the Leo Spur
- Cosmicflows-4: The Baryonic Tully-Fisher Relation Providing ~10,000 Distances
- XMP gas-rich dwarfs in nearby voids: results of BTA spectroscopy
- XMP gas-rich dwarfs in Nearby Voids: results of SALT spectroscopy
- Peculiar Velocities of Galaxies Just Beyond the Local Group
- Emission sparks around M 81 and in some dSph galaxies
- Star formation history and evolution of gas-rich dwarf galaxies in the Centaurus A group