Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-04
Astronomy and Astrophysics
Astrophysics
2 pages;Poster presented at XVIIth IAP Colloquium on Gaseous Matter In Galaxies And Intergalactic Space, 19-23 June 2001,Insti
Scientific paper
A survey of radio recombination lines (RLs) in the Galactic plane ($l = $ 332\deg $\to$ 89\deg) near 327 MHz made using the Ooty Radio Telescope (ORT) has detected carbon RLs from all the positions in the longitude range 0\deg $< l < $ 20\deg and from a few positions at other longitudes. The carbon RLs detected in this survey originate from ``diffuse'' \CII regions. Comparison of the \lv diagram and the radial distribution of carbon line emission with those obtained from hydrogen RLs near 3 cm from \HII regions and ``intense'' \CO emission indicates that the distribution of the diffuse \CII regions in the inner Galaxy is similar to that of spiral arm components. Towards several observed positions, the central velocities of the carbon RLs coincide with \HI self-absorption features suggesting an association of diffuse \CII regions with cool \HI. The observed widths of the lines from the two species are, however, different. We discuss possible reasons for the difference in the line widths.
Anantharamaiah K. R.
Anish Roshi D.
Kantharia Nimisha G.
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