Physical Conditions in the Dwarf Local Group Irregular Galaxy IC10. I- Diffuse Ionized Gas

Abstract

A detailed analysis on the physical conditions of the Interstellar Medium in the main body of the Local Group dwarf irregular galaxy IC 10 is carried out using long-slit spectroscopy. Maps of the excitation, the H$\alpha$ flux, [NII]/H$\alpha$ and [SII]/H$\alpha$ are presented. The Diffuse Ionized Gas inside the galaxy is studied. We found that the spectral characteristics are not similar to those for spiral galaxies: the values of the ratios [NII]/H$\alpha$ and [SII]/H$\alpha$ are not as large as in spiral galaxies but the excitation is much larger. These values, especially the large excitation, can be explained by proposing an extra source of ionization. Different sources are studied but any of the models at hand could be really fitted except a combination of photons leaking from the HII regions in addition to the ionization provided by the WR stars present in this galaxy. Shocks are not needed for explaining the line intensity ratios except in a small part in the west side of the galaxy.

12 pages, 12 figures, accepted for publication in A&A

References in corpus (5)

• Gemini observations of Wolf-Rayet Stars in the Local Group Starburst Galaxy IC10
• The Stellar Population and Star Clusters in the Unusual Local Group Galaxy IC 10
• Wolf-Rayets in IC10: Probing the Nearest Starburst
• IC 10: More evidence that it is a blue compact dwarf
• Extraplanar Emission-Line Gas in Edge-On Spiral Galaxies. II. Optical Spectroscopy

Cited by in corpus (12)

• Molecular tracers of high mass star-formation in external galaxies
• Modeling ionized gas in low-metallicity environments: the Local Group dwarf galaxy IC10
• A synchrotron superbubble in the IC 10 Galaxy: a hypernova remnant?
• On the stellar content of the starburst galaxy IC10
• Warm ionized gas in the blue compact galaxy Haro 14 viewed by MUSE. The diverse ionization mechanisms acting in low-mass starbursts
• Diffuse Ionized Gas in irregular galaxies:I- GR 8 and ESO 245-G05
• Diffuse Ionized Gas in the Dwarf Irregular Galaxy DDO 53
• Gas Emission Spectrum in the Irr Galaxy IC 10
• Diffuse Ionized Gas inside the dwarf irregular galaxy NGC 6822
• Bidimensional Exploration of the warm-Temperature Ionised gaS (BETIS) I. Showcase sample and first results
• Star Formation Rate in late-type galaxies: I- The H(alpha) and FUV integrated values
• Kinematics and Feedback in H II regions in the Dwarf Starburst Galaxy IC 10