Infrared emission of Galactic Hii regions

Abstract

Infrared emission from Hii regions has been extracted from the IRAS databases for a sample of Galactic Hii regions identified by radio continuum and recombination line surveys. This investigation, based on a sample of radio Hii regions, should lessen the bias towards local Hii regions which are larger and brighter on average. The infrared luminosity, color, and physical properties have been extracted from this data set as a function of Galactocentric distance. The global infrared properties of the Hii regions are quite uniform with some very interesting exceptions.