Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987rpsct.......53v&link_type=abstract
In its JPRS Report: Science and Technology. USSR: Space p 53 (SEE N88-16063 08-42) Transl. into ENGLISH from Pisma v Astronomich
Astronomy and Astrophysics
Astronomy
Emission Spectra, Extragalactic Radio Sources, Hydroxyl Emission, Masers, Star Formation, Very Long Base Interferometry, Brightness Distribution, Radio Astronomy, Stimulated Emission
Scientific paper
The OH maser source W33 was studied at a frequency 1665 MHz. In the continuous radio emission there is an extended region surrounding the compact W33 MAIN, in which star formation transpires. In W33 there are several discrete IR sources coinciding with the youngest HII zones. There are two regions with intermediate velocities of 36 km/s (W33A) and 56 km/s (W33B). A detailed knowledge of the horizontal structure of W33A is necessary for research on star formation. W33A observations were made using interferometers during 1983 and 1984. The image was constructed using a model with free parameters on the assumption that the source consists of a minimum number of components with a Gaussian spatial brightness distribution and that emission of no more than two components is received in each spectral channel. The spectral measurements revealed that the source spectrum consists of overlapping details with widths of about 2 kHz. The emission of the spectral lines is determined by several spatially separated regions. A map was constructed showing that the source is highly elongated and consists of six components which can be divided into three groups. The spectrum obtained in observations corresponds to the computed spectrum of the model.
Diamond PH
Graham Dave
Velikhov Ye. V.
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