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26 April 2024 |
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Low-frequency Carbon Recombination Lines towards HI self-absorption features in the Galactic Plane | | D. Anish Roshi
; Nimisha G. Kantharia
; K. R. Anantharamaiah
; | | Date: |
4 Oct 2001 | | Subject: | astro-ph | | Affiliation: | 1,2), Nimisha G. Kantharia , K. R. Anantharamaiah (National Radio Astronomy Observatory, Green Bank, WV, USA National Centre for Radio Astrophysics, TIFR, Pune, India Raman Research Institute, Bangalore, India | | Abstract: | A survey of radio recombination lines (RLs) in the Galactic plane ($l = $ 332deg $ o$ 89deg) near 327 MHz made using the Ooty Radio Telescope (ORT) has detected carbon RLs from all the positions in the longitude range 0deg $< l < $ 20deg 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. | | Source: | arXiv, astro-ph/0110121 | | Services: | Forum | Review | PDF | Favorites | |
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