• Hydrogen recombination lines near 327 MHz−II: A Galactic plane survey with a 2°×6′ beam

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    • Keywords


      Galaxy: general; Hii regions; ISM: clouds; ISM: general; ISM: structure; radio lines: ISM

    • Abstract


      In a previous paper we presented a low-resolution (2°×2°) survey of radio recombination lines (RRLs) at 327 MHz in the longitude rangel=330° to 0° to 89°. In this paper, we present the results of a higher resolution (2°×6′) survey of RRLs from seven 2°-wide fields and two 6°-wide fields in the same longitude range. Observations were made using the Ooty Radio Telescope (ORT). A total of 252 spectra that were obtained are presented. RRLs were detected in almost all the individual positions within the fields withl<35° and at several individual positions within the fields in the longitude rangel=35° to 85°. Detailed analysis of the data towards the field centered at G45.5+0.0, shows that the line emission consists of discrete zones of ionized gas. The angular extent of these zones are likely to be one degree or more corresponding to a linear size of >110 pc at the kinematic distance.

    • Author Affiliations


      D. Anish Roshi1 2 K. R. Anantharamaiah3

      1. National Centre for Radio Astrophysics, TIFR, Pune, India
      2. National Radio Astronomy Observatory, Green Bank, USA
      3. Raman Research Institute, Bangalore - 560 080, India
    • Dates

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