Ionizing Sources of Extragalactic HII Regions: Tight Clusters vs. Distributed OB Associations

Details Ionizing Sources of Extragalactic HII Regions: Tight Clusters vs. Distributed OB Associations Ionizing Sources of Extragalactic HII Regions: Tight Clusters vs. Distributed OB Associations

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715230e&link_type=abstract

American Astronomical Society, AAS Meeting #217, #152.30; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Extragalactic giant HII regions (EGHRs) are sites of active, concentrated star formation, providing ideal labs to analyze starburst phenomenon. The most interesting starburst issue is whether a tight cluster forms and later becomes a globular cluster or distributed OB associations form and later disperse. The two nearest EGHRs serve as standards for each; 30 Dor in the Large Magellanic Cloud hosts a dominant cluster and NGC 604 in M33 hosts multiple OB associations. To investigate the mode of star formation in EGHRs, we have searched the Hubble Legacy Archives (HLA) and identified a sample of >50 EGHRs in galaxies closer than 15 Mpc, limiting our selection by an H-alpha luminosity threshold of 1.5 x 1040 ergs s-1. Binned images of 30 Dor and NGC 604 in continuum bands are used to simulate clusters and distributed OB associations at distances of the EGHRs in our HLA sample. We have analyzed the continuum images of the EGHRs and compared them with the simulated images of 30 Dor and NGC 604 in order to assess whether the ionizing source is dominated by a tight cluster or distributed OB associations. We have also correlated the modes of star formation in EGHRs with the types of their host galaxies and their location within them. Implications of our results on starbursts and formation of EGHRs will be discussed.

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