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HI 21cm-line Observations with the GMRT Towards Interstellar Clouds Previously Seen in Optical Absorption

Published online by Cambridge University Press:  26 May 2016

R. Mohan ,
K.S. Dwarakanath ,
G. Srinivasan  and
J.N. Chengalur
R. Mohan
Affiliation:
1 Raman Research Institute, Bangalore 560080, India
K.S. Dwarakanath
Affiliation:
1 Raman Research Institute, Bangalore 560080, India
G. Srinivasan
Affiliation:
1 Raman Research Institute, Bangalore 560080, India
J.N. Chengalur
Affiliation:
2National Center for Radio Astrophysics, TIFR, Post Bag 3, Ganeshkhind, Pune 411007, India

Abstract

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We have made HI 21cm-line absorption measurements using the GMRT towards 15 directions in the Galaxy which are known to have high random velocity clouds as seen in the optical absorption lines of CaII and NaI. For the first time, in 6 out of these 15 directions we detect HI absorption features corresponding to the high random velocity optical absorption lines. The mean optical depth of these detections is ∼ 0.08.

Type
Part 6: Spectral Studies of our Galaxy
Information
Symposium - International Astronomical Union , Volume 199: The Universe at Low Radio Frequencies , 2002 , pp. 341 - 342
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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