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

Gear, Walter Kieran ORCID: https://orcid.org/0000-0001-6789-6196, Robson, E. I. and Griffin, Matthew Joseph ORCID: https://orcid.org/0000-0002-0033-177X 1988. Millimetre and submillimetre observations of the emission from dust in compact H II regions. Monthly Notices of the Royal Astronomical Society 231 , pp. 55-62.

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Abstract

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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	Astronomical Spectroscopy, Cosmic Dust, H Ii Regions, Hydrogen Clouds, Radio Sources (astronomy), Emission Spectra, Emissivity, Millimeter Waves, Nebulae, Submillimeter Waves
Publisher:	Wiley-Blackwell
ISSN:	0035-8711
Last Modified:	21 Oct 2022 09:26
URI:	https://orca.cardiff.ac.uk/id/eprint/36369

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