2005A&A...442..443H


Query : 2005A&A...442..443H

2005A&A...442..443H - Astronomy and Astrophysics, volume 442, 443-453 (2005/11-1)

Physical conditions in the dwarf local irregular galaxy IC 10. I. Diffuse ionized gas.

HIDALGO-GAMEZ A.M.

Abstract (from CDS):

A detailed analysis of 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 Hα flux, [NII]/Hα and [SII]/Hα are presented. The Diffuse Ionized Gas inside the galaxy is studied. We found that the spectral characteristics are not similar to those of spiral galaxies: the values of the ratios [NII]/Hα and [SII]/Hα 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 to explain the line intensity ratios except in a small part in the west side of the galaxy.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: irregular - galaxies: dwarf - stars: Wolf-Rayet - galaxie: ISM - galaxies: local group

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 748 2
2 TYC 3665-1255-1 * 00 20 20.8218563856 +59 17 35.590807572   13.36 12.68     ~ 1 0
3 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1082 0
4 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12107 1
5 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 743 2
6 NAME Local Group GrG ~ ~           ~ 7904 0

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2023.02.04-09:00:11

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