Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238...28d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 28-38. Research supported by the Ministerio de Edu
Astronomy and Astrophysics
Astronomy
38
Emission Spectra, H Ii Regions, Infrared Spectra, Star Formation, Starburst Galaxies, Cosmic Dust, Galactic Nuclei, Hydrocarbons, Infrared Astronomy Satellite, Interstellar Gas, Statistical Analysis
Scientific paper
A statistical analysis has been performed of a large number of H II galaxies, and their optical vs IRAS properties have been compared. It is found that the most compact, low-metallicity galaxies are not detected by IRAS. The far-IR luminosity is not a good measure of starburst processes, while the ratio I(25)/I(100) is an excellent tracer of recent star formation events. The emission at 25 microns may be due to hot thermal dust very near the OB associations and/or shocked dusty gas. The emission at 12 microns fits very well the predictions that follow from the model of emission of transiently heated PAH molecules. It is concluded that the results support the idea that the emission at 25 microns is due to, or at least dominated by, a burst of star formation occurring in the nuclei of these galaxies.
Dultzin-Hacyan Deborah
Masegosa Josefa
Moles Mariano
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