Ionized gas in the Irr galaxy IC 10: The emission spectrum and ionization sources |
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Authors: | V P Arkhipova O V Egorov T A Lozinskaya A V Moiseev |
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Institution: | (1) NARO, National Radio Astronomy Observatory Tucson, 949 North Cherry Avenue, Tucson, AZ 857521-0655, USA;(2) Russian Academy of Sciences, P.N. Lebedev Physical Institute, Laninsky Prospect 53, Moskva, 119991, Russia |
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Abstract: | We present the observations of the Irr galaxy IC 10 at the 6-m SAO telescope with the panoramic Multi-Pupil Fiber Spectrograph
(MPFS). Based on the results of these observations and our long-slit spectroscopy performed previously, we have investigated
the ionized-gas emission spectrum in the region of intense star formation and refined the gas metallicity estimates. We show
that the “diagnostic diagrams” constructed from our observations agree best with the new improved ionization models by Martin-Manjon
et al. Using these models, we have determined the electron density and gas ionization parameter and ionizing-cluster characteristics,
the age and mass, from the spectra of the investigated HII regions. The cluster ages and masses are shown to be within the
ranges 2.5–5 Myr and (0.2–1) × 105
M
⊗, respectively. |
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Keywords: | |
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