The Stellar Populations of HII galaxies: A tale of three bursts
Eduardo Telles, Jorge Melnick

TL;DR
This study models the star formation history of HII galaxies using spectral energy distribution fitting across UV to mid-IR wavelengths, revealing they experience three major starburst episodes with current bursts being maximal but contributing minimally to total stellar mass.
Contribution
Introduces a three-burst star formation history model for HII galaxies and refines burst age estimates by accounting for old stellar populations.
Findings
Star formation in HII galaxies occurs in three major episodes.
Current starbursts contribute less than a few percent of total stellar mass.
Hβ luminosity correlates with young star mass, supporting a universal IMF.
Abstract
We present a UV to mid-IR spectral energy distribution study of a large sample of SDSS DR13 HII galaxies. These are selected as starburst (EW(H\AA) and for their high excitation locus in the upper-left region of the BPT diagram. Their photometry was derived from the cross-matched GALEX, SDSS, UKDISS and WISE catalogues. We have used CIGALE modelling and SED fitting routine with the parametrization of a three burst star formation history, and a comprehensive analysis of all other model parameters. We have been able to estimate the contribution of the underlying old stellar population to the observed equivalent width of H and allow for more accurate burst age determination. We found that the star formation histories of HII Galaxies can be reproduced remarkably well by three major eras of star formation. In addition, the SED fitting results indicate that: i) in all…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Stellar, planetary, and galactic studies · Astronomy and Astrophysical Research
