Gear, Walter Kieran ![]() |
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 |
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Date Type: | Publication |
Status: | Published |
Schools: | 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: | 21 Oct 2022 09:26 |
URI: | https://orca.cardiff.ac.uk/id/eprint/36370 |
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