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2006AJ....131.2078H - Astron. J., 131, 2078-2088 (2006/April-0)

Diffuse ionized gas in irregular galaxies. I. GR 8 and ESO 245-G05.


Abstract (from CDS):

We have studied the spectral characteristics of the diffuse ionized gas (DIG) in two irregular galaxies with low metallicities and intermediate star formation rates: ESO 245-G05 and GR 8. The [O III]/Hβ ratio in these galaxies is higher than in the DIG of spiral galaxies but not as high as in other irregular galaxies previously studied, such as IC 10 and NGC 6822. The [N II]/Hα and [S II]/Hα ratios have very small values, indicating the absence of shocks as the ionization source for this gas. This ionization can be explained in both galaxies with photon leakage from the H II regions as the only source. The percentage of photons that have escaped from the H II regions is small in ESO 245-G05, only 35%, but varies from 35% up to 60% in GR 8. We also investigated whether the differences found between spiral and irregular galaxies in the [O III]/Hβ and the [N II]/Hα ratios are due to differences in the metal content between these types of galaxies. Although the number of galaxies studied is not very large, it can be concluded that the [O III]/Hβ ratio is not related to the oxygen content, while the situation is more ambiguous for the [N II]/Hα ratio.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: Alphanumeric: GR 8 - galaxies: individual (ESO 245-G05) - Galaxies: Irregular - ISM: H II Regions

Nomenclature: Table 3: [H2006] ESO 245-05 dN (Nos d1-d4), [H2006] ESO 245-05 hN (Nos h1-h3). Table 4: [H2006] GR 8 adN (Nos ad1-ad2), [H2006] GR 8 bdN (Nos bd1-bd3), [H2006] GR 8 cdN (Nos cd1-cd2), [H2006] GR 8 ddN (Nos dd1-dd2), [H2006] GR 8 edN (Nos ed1-ed2), [H2006] GR 8 ahN (No. ah1), [H2006] GR 8 bhN (Nos bh1-bh2), [H2006] GR 8 chN (No. ch1), [H2006] GR 8 dhN (No. dh1), [H2006] GR 8 ehN (No. eh1), [H2006] GR 8 fhN (No. fh1).

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