The WISE Catalog of Galactic HII Regions consists of 8000 Galactic HII regions
and HII region candidates selected by searching for their characteristic
mid-infrared (MIR) morphology. WISE has sufficient sensitivity to detect the MIR
emission from HII regions located anywhere in the Galactic disk. This is the
most complete catalog yet of regions forming massive stars in the Milky Way. Of
the ~8000 cataloged sources, ~1500 have measured radio recombination line (RRL)
or Halpha emission, and are thus known to be HII regions. This sample improves
on previous efforts by resolving HII region complexes into multiple sources and
by removing duplicate entries. There are ~2500 candidate HII regions in the
catalog that are spatially coincident with radio continuum emission. Previous
RRL studies show that ~95% of such targets are HII regions. Approximately 500 of
these candidates are also positionally associated with known HII region
complexes, so the probability of their being bona fide HII regions is even
higher. At the sensitivity limits of existing surveys, ~4000 catalog sources
show no radio continuum emission. Distances for ~1500 catalog sources and
molecular velocities for ~1500 HII region candidates are taken from the literature.
If you use GalHII data, please cite both the journal article
Anderson et al. (2014)
and the dataset Digital Object Identifier (DOI):
10.26131/IRSA146.
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GalHII Overview
IRSA Catalog Search Tool: GalHII