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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/022/01/0035-0050

    • Keywords

       

      ISM: clouds, kinematics and dynamics; Radio lines: ISM

    • Abstract

       

      Nearby interstellar clouds with high (|ν|≥10km s−1) 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 ∼10km s−1, consistent with absorption arising from CNM clouds.

    • Author Affiliations

       

      Rekhesh Mohan1 K. S. Dwarakanath1 G. Srinivasan1 Jayaram N. Chengalur2

      1. Raman Research Institute, Bangalore - 560 080, India
      2. National Center for Radio Astrophysics, Ganeshkhind, Pune - 411 007, India
    • Dates

       
  • Journal of Astrophysics and Astronomy | News

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