Nebular metallicities in two isolated local void dwarf galaxies

David C. Nicholls; Helmut Jerjen; Michael A. Dopita; Hassan Basurah

doi:10.1088/0004-637X/780/1/88

Nebular metallicities in two isolated local void dwarf galaxies

David C. Nicholls, Helmut Jerjen, Michael A. Dopita, Hassan Basurah

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

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 H II 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.

Original language	English
Article number	88
Journal	Astrophysical Journal
Volume	780
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/780/1/88
Publication status	Published - 1 Jan 2014

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10.1088/0004-637X/780/1/88

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title = "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 H II 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.",

keywords = "Hii regions, ISM: abundances, galaxies: dwarf, galaxies: evolution, galaxies: individual ([KK98]246 (ESO 461-G036), MCG-01-41-006 (HIPASS J1609-04)), galaxies: irregular",

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T1 - Nebular metallicities in two isolated local void dwarf galaxies

AU - Nicholls, David C.

AU - Jerjen, Helmut

AU - Dopita, Michael A.

AU - Basurah, Hassan

PY - 2014/1/1

Y1 - 2014/1/1

N2 - 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 H II 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.

AB - 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 H II 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.

KW - Hii regions

KW - ISM: abundances

KW - galaxies: dwarf

KW - galaxies: evolution

KW - galaxies: individual ([KK98]246 (ESO 461-G036), MCG-01-41-006 (HIPASS J1609-04))

KW - galaxies: irregular

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DO - 10.1088/0004-637X/780/1/88

M3 - Article

SN - 0004-637X

VL - 780

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 88

ER -

Nebular metallicities in two isolated local void dwarf galaxies

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