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Oxygen Abundance Throughout the Dwarf Starburst Galaxy IC 10

dc.contributor.authorMaren Cosens
dc.contributor.authorShelley A. Wright
dc.contributor.authorKarin Sandstrom
dc.contributor.authorLee Armus
dc.contributor.authorNorman Murray
dc.contributor.authorJordan N. Runco
dc.contributor.authorSanchit Sabhlok
dc.contributor.authorJames Wiley
dc.contributor.otherThe Observatories, Carnegie Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA ; mcosens@carnegiescience.edu
dc.contributor.otherPhysics Department, University of California , San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA; Department of Astronomy, University of California , San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
dc.contributor.otherDepartment of Astronomy, University of California , San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
dc.contributor.otherSpitzer Science Center, California Institute of Technology , 1200 E. California Boulevard, Pasadena, CA 91125, USA
dc.contributor.otherCanadian Institute for Theoretical Astrophysics, University of Toronto , 60 St. George Street, Toronto, ON M5S 3H8, Canada
dc.contributor.otherDepartment of Physics & Astronomy, University of California , Los Angeles, Los Angeles, CA 90095, USA
dc.contributor.otherPhysics Department, University of California , San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
dc.contributor.otherPhysics Department, University of California , San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
dc.date.accessioned2025-10-09T05:14:47Z
dc.date.available2025-10-09T05:14:47Z
dc.date.issued01-01-2024
dc.identifier.urihttps://doi.org/10.3847/1538-3881/ad7f3c
dc.identifier.urihttp://digilib.fisipol.ugm.ac.id/repo/handle/15717717/40872
dc.description.abstractMeasurements of oxygen abundance throughout galaxies provide insight to the formation histories and ongoing processes. Here we present a study of the gas-phase oxygen abundance in the H ii regions and diffuse gas of the nearby starburst dwarf galaxy, IC 10. Using the Keck Cosmic Web Imager at W. M. Keck Observatory, we map the central region of IC 10 from 3500 to 5500 Å. The auroral [O III ] 4363 Å line is detected with a high signal-to-noise ratio in 12 of 46 H II regions observed, allowing for direct measurement of the oxygen abundance, yielding a median and standard deviation of $12+\mathrm{log}({\rm{O}}/{\rm{H}})=8.37\pm 0.25$ . We investigate trends between these directly measured oxygen abundances and other H II region properties, finding weak negative correlations with the radius, velocity dispersion, and luminosity. We also find weak negative correlations between the oxygen abundance and the derived quantities of turbulent pressure and ionized gas mass, and a moderate correlation with the derived dynamical mass. Strong line, R _23 abundance estimates are used in the remainder of the H II regions and on a resolved spaxel-by-spaxel basis. There is a large offset between the abundances measured with R _23 and the auroral line method. We find that the R _23 method is unable to capture the large range of abundances observed via the auroral line measurements. The extent of this variation in the measured abundances further indicates a poorly mixed interstellar medium in IC 10, which is not typical of dwarf galaxies and may be partly due to the ongoing starburst, accretion of pristine gas, or a late stage merger.
dc.language.isoEN
dc.publisherIOP Publishing
dc.subject.lccAstronomy
dc.titleOxygen Abundance Throughout the Dwarf Starburst Galaxy IC 10
dc.typeArticle
dc.description.keywordsStarburst galaxies
dc.description.keywordsDwarf galaxies
dc.description.keywordsDwarf irregular galaxies
dc.description.keywordsChemical abundances
dc.description.keywordsH II regions
dc.description.keywordsCompact H II region
dc.description.doi10.3847/1538-3881/ad7f3c
dc.title.journalThe Astronomical Journal
dc.identifier.e-issn1538-3881
dc.identifier.oaioai:doaj.org/journal:3166e6339083496cb8bb6403c5a69bc9
dc.journal.infoVolume 168, Issue 6


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