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Title: GMRT observations of interstellar clouds in the 21cm line of atomic hydrogen.
Authors: Mohan, Rekhesh
Dwarakanath, K.S.
Srinivasan, G.
Chengalur, J.N.
Issue Date: Mar-2001
Publisher: Indian Academy of Sciences, Bangalore, India.
Citation: Journal of Astrophysics and Astronomy, 2001, Vol.22, p35
Abstract: Nearby interstellar clouds with high (|v| >/= 10 km/s) random velocities although easily detected in NaI and CaII lines have hitherto not been detected (in emission or absorption) in the HI 21cm line. We describe here deep Giant Metrewave Radio Telescope (GMRT) HI absorption observations toward radio sources with small angular separation from bright O and B stars whose spectra reveal the presence of intervening high random velocity CaII absorbing clouds. In 5 out of the 14 directions searched we detect HI 21cm absorption features from these clouds. The mean optical depth of these detections is ~ 0.09 and FWHM is ~ 10 km/s, consistent with absorption arising from CNM clouds.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0250-6335
Alternative Location: 10.1007/BF02933589
Copyright: 2011 Indian Academy of Sciences, Bangalore, India.
Appears in Collections:Research Papers (A&A)

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