Nebular metallicities in two isolated Local Void dwarf galaxies

Abstract

Isolated dwarf galaxies, especially those situated in voids, may provide insight into primordial conditions in the Universe and the physical processes that govern star formation in undisturbed stellar systems. The metallicity of H ii regions in such galaxies is key to investigating this possibility. From the SIGRID sample of isolated dwarf galaxies, we have identified two exceptionally isolated objects, the Local Void galaxy [KK98]246 (ESO 461-G036) and another somewhat larger dwarf irregular on the edge of the Local Void, MCG-01-41-006 (HIPASS J1609- 04). We report our measurements of the nebular metallicities in these objects. The first object has a single low luminosity Hii region, while the second is in a more vigorous star forming phase with several bright H ii regions. We find that the metallicities in both galaxies are typical for galaxies of this size, and do not indicate the presence of any primordial gas, despite (for [KK98]246) the known surrounding large reservoir of neutral Hydrogen.

37 pages, 12 figures, accepted for publication is Astrophysical Jornal

References in corpus (8)

• The ACS Nearby Galaxy Survey Treasury
• Updated Nearby Galaxy Catalog
• New Strong Line Abundance Diagnostics for \HII Regions: Effects of $\kappa$-Distributed Electron Energies and New Atomic Data
• The Wide Field Spectrograph (WiFeS): Performance and Data Reduction
• Resolving the electron temperature discrepancies in HII Regions and Planetary Nebulae: kappa-distributed electrons
• Deep Near-IR Surface Photometry of 57 Galaxies in the Local Sphere of Influence
• Search for Blue Compact Dwarf Galaxies During Quiescence
• The Minimum Amount of Stars a Galaxy Will Form

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• XMP gas-rich dwarfs in Nearby Voids: results of SALT spectroscopy
• The influence of the void environment on the ratio of dark matter halo mass to stellar mass in SDSS MaNGA galaxies
• Void Galaxy Distribution: A Challenge for $\Lambda$CDM
• Determining the large-scale environmental dependence of gas-phase metallicity in dwarf galaxies
• XMP gas-rich dwarfs in Nearby Voids: candidate selection
• What do planetary nebulae and H II regions reveal about the chemical evolution of nearby dwarf galaxies?