HII Regions in the Outer Disk and Tidal Arms of M81

Details HII Regions in the Outer Disk and Tidal Arms of M81 HII Regions in the Outer Disk and Tidal Arms of M81

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543209p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #432.09; Bulletin of the American Astronomical Society, Vol. 42, p.368

Astronomy and Astrophysics

Astronomy

Scientific paper

The outer disk spiral arms of M81, caused by the interaction with M82 and NGC3077, are fertile grounds for exploring star formation in low density environments. The area is characterized by extended HI arms and filaments within which are found HII regions and dwarf galaxies, including HoIX. Much attention has focused in past years on the evidence for star formation and on the properties of the stellar populations detected in these HI features, especially from recent GALEX and HST observations. Here we report on a study of the HII region population over a 1.5 degree field, derived from a Burrell Schmidt Hα composite supplemented with ARC 3.5-m telescope emission line images of both inner and outer disk HII regions. We discuss the luminosities and morphologies of the HII regions and compare the current massive star formation with the recent and past rates inferred from the stellar populations detected in the outer disk features.

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