The GBT Galactic HII Region Discovery Survey Source Catalog

Details The GBT Galactic HII Region Discovery Survey Source Catalog The GBT Galactic HII Region Discovery Survey Source Catalog

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21713201b&link_type=abstract

American Astronomical Society, AAS Meeting #217, #132.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The Green Bank Telescope (GBT) HII Region Discovery Survey (HRDS) has doubled the number of known HII regions in the Galactic zone 343 deg < Lgal < 67 deg with |Bgal| < 1 deg. We detected 603 discrete Hydrogen radio recombination line (RRL) components at 9 GHz (3cm) from 448 targets. Our targets were selected based on spatially coincident mid-infrared and 20 cm radio continuum emission. Such sources are almost invariably HII regions; we detect hydrogen RRL emission from 95% of our target sample. The sensitivity of the GBT and the power of its spectrometer together made this survey possible. Here we report on the HRDS catalog of the measured properties of the RRL and continuum emission from the survey nebulae. The derived survey completeness limit, 180 mJy at 9 GHz, is sufficient to detect all HII regions ionized by single O-stars to a distance of 15 kpc. These recently discovered nebulae share the same distribution on the sky as does the previously known census of Galactic HII regions. On average, however, the new nebulae have fainter continuum fluxes, smaller continuum angular sizes, fainter RRL intensities and smaller RRL line widths. Though small in angular size, many of our new nebulae show little spatial correlation with tracers associated with extremely young HII regions, implying that our sample spans a range of evolutionary states. We discovered 34 first quadrant negative-velocity HII regions, which lie at extreme distances from the Sun and appear to be part of the Outer Arm. We found RRL emission from 211 Spitzer GLIMPSE 8 micron ``bubble'' sources, 65 of which have been catalogued previously. It thus appears that nearly all GLIMPSE bubbles are HII regions and that 50% of all Galactic HII regions have a bubble morphology at 8 microns.

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