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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/019/03-04/0079-0096

    • Keywords

       

      ISM: structure, clouds

    • Abstract

       

      We present a survey of molecular gas in theJ = 1 → 0 transition of12CO towards the IRAS Vela Shell. The shell, previously identified from IRAS maps, is a ring-like structure seen in the region of the Gum Nebula. We confirm the presence of molecular gas associated with some of the infrared point sources seen along the shell. We have studied the morphology and kinematics of the gas and conclude that the shell is expanding at the rate of ~ 13 km s-1 from a common center. We go on to include in this study the Southern Dark Clouds seen in the region. The distribution and motion of these objects firmly identify them as being part of the shell of molecular gas. Estimates of the mass of gas involved in this expansion reveal that the shell is a massive object comparable to a GMC. From the expansion and various other signatures like the presence of bright-rimmed clouds with head-tail morphology, clumpy distribution of the gas etc., we conjecture that the molecular gas we have detected is the remnant of a GMC in the process of being disrupted and swept outwards through the influence of a central OB association, itself born of the parent cloud.

    • Author Affiliations

       

      Jayadev Rajagopal1 G. Srinivasan1

      1. Raman Research Institute, Bangalore - 560 080, India
    • Dates

       
  • Journal of Astrophysics and Astronomy | News

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