Millimetre and submillimetre observations of the emission from dust in compact H II regions

Details Millimetre and submillimetre observations of the emission from dust in compact H II regions Millimetre and submillimetre observations of the emission from dust in compact H II regions

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.231p..55g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 231, March 15, 1988, p. 55p-62p.

Astronomy and Astrophysics

Astronomy

15

Astronomical Spectroscopy, Cosmic Dust, H Ii Regions, Hydrogen Clouds, Radio Sources (Astronomy), Emission Spectra, Emissivity, Millimeter Waves, Nebulae, Submillimeter Waves

Scientific paper

The authors report observations at 0.35, 0.8, 1.1 and 3.3 mm with almost identical beamsizes between 0.8 - 3.3 mm of a small sample of compact H II regions selected from the IRAS catalogue. They find (1) a mean long-wavelength emissivity law β = 1.75±0.20; (2) a short-wavelength emissivity law β ≤ 1; (3) the transition between the two regimes occurring at a wavelength somewhat longer than generally assumed; (4) a substantial contribution to the 3.3-mm fluxes from free-free emission.

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