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Co Distributions towards the Southern Dark Cloud of DC 303.6+0.9

Published online by Cambridge University Press:  12 April 2016

Jing-sheng Wang  and
Robina E. Otrupcek
Jing-sheng Wang
Affiliation:
Yunnan Observatory, P.O. Box 110, Kunming, 650011, P.R. China
Robina E. Otrupcek
Affiliation:
Australian NRAO, P.O. Box 276, Parkes, N.S.W. 2870, Australia

Abstract

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Dark clouds in the southern skies have been observed with CO J = 1-0 line. The mm-wave telescope of 4-m diameter was used. The beam width was 2’.7 at 2.6 mm wavelength and beam efficiency 0.52. The authors have developed a high-resolution acousto-optical spectrograph with a velocity resolution of 0.07 kms-1 for this purpose. The 115.27 GHz line was detected over an area of 27’ x 21’ including the dark cloud of DC 303.6+0.9 in Crux. Most of the positions, out of a total number of 63, show a double peak line structure. Some positions also show red and blue shifted wings. An average profile shows a higher peak at the radial velocity of -2.8 kms-1 with a calibrated radiation temperature of 5.5 K, a half line width of 1.5 kms-1, and another peak in relative red at a velocity of -0.8 kms-1 with a temperature of 4.3 K, a half line widh of 1.0 kms-1. Profiles distributed over this area show a bipolar diagram. It hints that a certain systematic motions may exist in this region.

Type
I. Molecular Clouds, Star Formation And HII Regions
Information
International Astronomical Union Colloquium , Volume 120: Structure and Dynamics of the Interstellar Medium , 1989 , pp. 13 - 17
Copyright
Copyright © Springer-Verlag 1989

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