Flux densities of ultracompact H II regions at 7 millimeters

Details Flux densities of ultracompact H II regions at 7 millimeters Flux densities of ultracompact H II regions at 7 millimeters

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..884w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 15, 1988, p. 884-888.

Astronomy and Astrophysics

Astronomy

22

Flux Density, H Ii Regions, Hydrogen Clouds, Millimeter Waves, Stellar Evolution, Infrared Astronomy, Radio Astronomy

Scientific paper

Observations of the 7-mm continuum are reported for 29 suspected ultracompact (UC) H II regions. Twenty-seven sources were detected, most of which had not previously been observed at 7 mm. These sources were found to be small (only eight were fully resolved by the 43-arcsec beam) and bright at mm wavelengths (greater than 0.5 Jy), making them easy to distinguish from associated diffuse free-free emission which can confuse single-dish observations made at cm wavelengths. The ionizing stars are mostly O5-O6, consistent with the detection limit of 0.5 Jy. It is found that dust in UC H II regions typically absorbs more than 50 percent of the stellar ionizing photons. Some of the sources reported here might also serve as flux and pointing calibrators at mm wavelengths.

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