Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205..297g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 205, Oct. 1983, p. 297-302.
Astronomy and Astrophysics
Astronomy
23
Astronomical Spectroscopy, Hydrogen Clouds, Hydroxyl Emission, Interstellar Masers, Radio Astronomy, Infrared Spectra, Normal Density Functions, Stellar Evolution, Time Dependence
Scientific paper
VLA observations of 4765-MHz OH masers have been made towards W3(OH) and W3(cont.) with a resolution of 1.3 arcsec. For W3(OH) the maser emission centres are in four groups located within a region of size arcsec (10-2 pc) superimposed on the western side of the continuum distribution. The positions do not correspond with those of the 1.6-GHz OH masers which are considerably more distributed in declination. For W3(cont.) the maser is located within 2 arcsec of IRS5, the infrared source which has no detectable radio continuum but is the brightest pre-main-sequence object known at 20 μm. The peak maser gain for W3(OH) is ≡102 and for W3(cont.) >104. The latter maser varies with time, which is consistent with its higher maser gain.
Gardner Frank F.
Palmer Patrick
Whiteoak John B.
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