Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011bsrsl..80..410p&link_type=abstract
Société Royale des Sciences de Liège, Bulletin, vol. 80, p. 410-414 (Proceedings of the 39th Liège Astrophysical Colloquium, hel
Mathematics
Logic
Scientific paper
We present a novel approach for distinguishing density-bounded vs radiation bounded HII regions based on [SII]/Hα and [SII]/[OIII] ratio maps. We find most HII regions fall into one of three categories: radiation bounded, open blister type, and density bounded. Our approach directly diagnoses the existence of ionization fronts around massive stars, revealing a significant number of HII regions to be density bounded. Furthermore, we can place a lower limit on the fraction of ionizing photons escaping each region yielding values consistent with other methods, with direct implications for the ionization of the Warm Interstellar Medium and reionization of the universe at high redshift. We conclude that the three morphological classifications are correlated with the observed N(HI) column density and Hα luminosity, however a more filamentary structure of the LMC does not lead to higher HII escape fractions than in the SMC.
Oey Sally M.
Pellegrini Eric W.
Points Sean
Smith Christopher R.
Winkler Frank P.
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