Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p..30j&link_type=abstract
Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present an analysis of the uncertainties caused by statistical IMF sampling on the properties of the ionizing spectrum of clusters of moderate masses. For this purpose, we extend our earlier work on NGC 588, a giant H II region (GHR) in the nearby galaxy M33. We find that for a cluster of the same age and mass as NGC 588, the prediction of the ionizing spectrum from a model that only fits integrated data, and in particular the equivalent width of Hβ, is quite hazardous, and cannot be blindly used to model the ionization of the surrounding GHR. We show that this result also applies to more massive clusters, such as the very bright GHR NGC 604. We finally draw attention to the importance of statistical IMF sampling effects in all star-forming regions, even the most massive ones, since the latter are generally calibrated using objects of more modest masses.
Cervino Miguel
Gonzalez Delgado Rosa Maria
Jamet Luc
Perez Emanuelle
Stasinska Grazina
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