Diffuse Ionized Gas in the Dwarf Irregular Galaxy DDO 53
A.M. Hidalgo-Gamez (ESFM-Ipn)
TL;DR
This study analyzes the spectral properties of the dwarf irregular galaxy DDO 53, revealing high excitation, low [SII]/Halpha ratios, and low metallicity, with photon leakage from HII regions as the main ionization source.
Contribution
It provides detailed spectral analysis of DDO 53, highlighting ionization mechanisms and physical conditions, and confirms its low-metallicity status.
Findings
High excitation and low [SII]/Halpha ratios similar to other irregular galaxies
Photon leakage from HII regions is the main ionization source
DDO 53 is confirmed as a low-metallicity galaxy
Abstract
The spectral characteristics throughout the dwarf irregular galaxy DDO 53 are studied. The results are very similar to those for other irregular galaxies: high excitation and low values of the [SII]/Halpha ratio. The most likely ionization source is photon leakage from the classical HII regions, without any other source, although the interstellar medium of the galaxy is quite perturbed. Moreover, the physical conditions throughout the galaxy do not change very much because both the photon leakage percentage and the ionization temperature are very similar. In addition, the determined metal content for two HII regions indicates that DDO 53 is a low-metallicity galaxy.
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