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Submillimetre observations reveal that DR21 (OH) is a double source

Gear, Walter Kieran, Chandler, C. J., Moore, T. J. T., Cunningham, C. T. and Duncan, W. D. 1988. Submillimetre observations reveal that DR21 (OH) is a double source. Monthly Notices of the Royal Astronomical Society 231 , pp. 47-54.

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Abstract

The region around the OH maser source DR21 (OH) has been scanned with a 20-arcsec beam at a wavelength of 350 microns and a hitherto unknown double structure, with two peaks of roughly equal mass separated by 40 arcsec (0.1 pc) in declination, has been discovered. The northernmost peak is coincident with the OH maser position and the centroid of the far-infrared emission, while the southern source has not previously been found at any wavelength. Both sources are extremely dense and deeply embedded, with optical depths of order unity even in the far-infrared. The southern source may be one of the densest molecular cores yet found, and is a candidate protostar. These results confirm that OB star formation can occur deep within molecular clouds, and not just at their edges.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Hydroxyl Emission, Interstellar Masers, Radio Sources (astronomy), Submillimeter Waves, Declination, High Resolution, Infrared Astronomy, Optical Thickness, Star Formation
Publisher: Wiley-Blackwell
ISSN: 0035-8711
Last Modified: 04 Jun 2017 04:18
URI: http://orca.cf.ac.uk/id/eprint/36370

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