Gas Emission Spectrum in the Irr Galaxy IC 10
T.A. Lozinskaya (Sternberg Astronomical Institute), O.V. Egorov, (Sternberg Astronomical Institute), A.V. Moiseev (Special Astrophysical, Observatory), and D.V. Bizyaev (Sternberg Astronomical Institute, Apache, Point Observatory)
TL;DR
This study presents spectroscopic observations of the dwarf irregular galaxy IC 10, analyzing its ionized gas emission spectra to determine chemical abundances and metallicity, providing insights into its star-forming regions.
Contribution
First detailed spectroscopic analysis of IC 10's ionized gas regions, with a focus on chemical abundances and metallicity estimation from strong emission lines.
Findings
Oxygen abundance is 12 + log(O/H) = 8.17 ± 0.35
Galaxy's metallicity is approximately 0.18 Z_sun
Abundance estimates from strong lines are more reliable than photoionization models
Abstract
Spectroscopic long-slit observations of the dwarf Irr galaxy IC 10 were conducted at the 6-m Special Astrophysical Observatory telescope with the SCORPIO focal reducer. The ionized-gas emission spectra in the regions of intense current star formation were obtained for a large number of regions in IC 10. The relative abundances of oxygen, N+, and S+ in about twenty HII regions and in the synchrotron superbubble were estimated. We found that the galaxy-averaged oxygen abundance is 12 + log(O/H) = 8.17 +- 0.35 and the metallicity is Z = 0.18 +- 0.14 Z_sun. Our abundances estimated from the strong emission lines are found to be more reliable than those obtained by comparing diagnostic diagrams with photoionization models.
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