HI 21cm-line observations with the GMRT towards interstellar clouds previously seen in optical absorption

Mohan, Rekhesh; Dwarakanath, K. S.; Srinivasan, G.; Chengalur, Jayaram N.

HI 21cm-line observations with the GMRT towards interstellar clouds previously seen in optical absorption

Authors

Mohan, Rekhesh

Dwarakanath, K. S.

Srinivasan, G.

Chengalur, Jayaram N.

Description

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.
2 pages, no figures, uses newpasp.sty, contributed talk at IAU Symposium 199 "The Universe at Low Radio Frequencies", held in Pune, Dec. 1999