A survey of radio recombination lines using the Ooty Radio Telescope at 328 MHz in the inner galaxy

Abstract

A survey of radio recombination lines in the Galactic plane with longitude -32°< l < +80°and latitude b < 3°using Ooty Radio Telescope (ORT) at 328MHz is reported. ORT observations were made using a New Digital Backend (NDB) recently added to the telescope. With the NDB ORT had a beam of 23 × 22 sec(δ) and a passband of 1MHz in the spectral line mode. The above-mentioned Galactic region was divided into 2°× 2°patches with the ORT beam pointed to the center. The ORT observations form a study of the distribution of extended low-density warm-ionized medium (ELDWIM) in the inner Galaxy using H271α RLs. By obtaining kinematical distances using V LSR of the H271α RLs, the distribution of ELDWIM clouds within the inner Galaxy has been deduced for the region given above. © 2012. The American Astronomical Society. All rights reserved.