The H ii Regions of M33. II. A Photometric Catalog of 1272 Newly Identified Emission Regions

Abstract

We have identified a total of 1272 newly recognized emission regions inM33. Combined with the previously cataloged total of 1066 H II regionsand supernova remnants, this brings M33's total to 2338 emissionregions. This paper provides photometry of the new objects in H{α},which is combined with data from previous catalogs to produce a global HII region luminosity function (corrected for incompleteness) thatreaches a faint luminosity limit of 2x10^34 ergs s^-1 and shows a broadmaximum with a peak frequency at luminosities of 6x10^35 ergs s^-1. Wealso plot the H II region size distribution and comment on unusualmorphologies.