SIMBAD references

2007AJ....133.1874H - Astron. J., 133, 1874-1882 (2007/May-0)

Diffuse ionized gas inside the dwarf irregular galaxy NGC 6822.


Abstract (from CDS):

We have studied the differences between the diffuse ionized gas (DIG) and the H II regions along a slit position in the local dwarf irregular galaxy NGC 6822. The slit position passes through the two most prominent H II regions: Hubble V and Hubble X. Important differences have been found in the excitation, ionization, and [N II] λ6584/Hα and [S II] λ6717/Hα line ratios between the DIG and the H II locations. Moreover, the values of all the line ratios are not similar to those in the DIG locations of spiral galaxies but are very similar to the values in other irregular galaxies, such as IC 10. We also determined the rate of recombination using the He I λ5875 line. Finally, we obtained a picture of the ionization sources of the DIG. We consider that the leakage of photons from the H II regions might explain most of the line ratios, except [N II]/Hα, which might be explained by turbulence.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 6822 - Galaxies: Irregular - Galaxies: ISM - ISM: H II Regions

Nomenclature: Fig.1, Table 1: [HP2007] DIG W (Nos E, C, W).

Simbad objects: 12

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