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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Nacional Autónoma de México
2009
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| Online Access: | https://www.redalyc.org/articulo.oa?id=57115687015 |
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Table of Contents:
- ON THE EARLY EVOLUTION OF YOUNG STARBURSTS D. Rosa González H. Schmitt E. Terlevich R. Terlevich Física, Astronomía y Matemáticas Galaxies: evolution radio continuum: galaxies We studied the radio properties of very young massive regions of star formation in HII galaxies, with the aim of detecting episodes of recent star formation in an early phase of evolution where the rst supernovae start to appear. The observed radio spectral energy distribution (SED) covers a behaviour range: (1) there are galaxies where the SED is characterized by a synchrotron-type slope; (2) galaxies with a thermal slope; and (3) galaxies with possible free-free absorption at long wavelengths. The latter SED represents a signature of massive starclusters that are still well inside the progenitor molecular cloud. Based on the comparison of the star formation rates (SFR) determined from the recombination lines and those determined from the radio emission we nd that SFR(H ) is on average ve times higher than SFR(1.4 GHz). These results suggest that the emission of these galaxies is dominated by a recent and massive star formation event in which the rst supernovae (SN) just started to explode. We conclude that the systematic lack of synchrotron emission in those systems with the largest equivalent width of H can only be explained if those are young starbursts of less than 3.5Myr ofage, i.e. before the rst type II SNe emerge. 2009 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57115687015 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.37