Carbon recombination lines near 327 MHz. I. ``Diffuse'' C II regions in the Galactic Disk

Details Carbon recombination lines near 327 MHz. I. ``Diffuse'' C II regions in the Galactic Disk Carbon recombination lines near 327 MHz. I. ``Diffuse'' C II regions in the Galactic Disk

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...391.1097r&link_type=abstract

Astronomy and Astrophysics, v.391, p.1097-1113 (2002)

Astronomy and Astrophysics

Astrophysics

5

Galaxy: General, Ism: General, Ism: Structure, Radio Lines: Ism, Infrared: Ism

Scientific paper

In earlier papers (Roshi & Anantharamaiah \cite{ra00}, \cite{ra01a}), we presented extensive surveys (angular resolution - 2o x 2o and 2o x 6 arcmin) of radio recombination lines (RRLs) near 327 MHz in the longitude range l = 332o -> 89o using the Ooty Radio Telescope. These surveys have detected carbon lines mostly between l = 358o -> 20o and in a few positions at other longitudes. This paper presents the observed carbon line parameters in the high-resolution survey and a study of the galactic distribution and angular extent of the line emission observed in the surveys. The carbon lines detected in the surveys arise in ``diffuse'' C II regions. The l-v diagram and radial distribution constructed from our carbon line data shows similarity with that obtained from hydrogen recombination lines at 3 cm from H II regions indicating that the distribution of the diffuse C II regions in the inner Galaxy resembles the distribution of the star-forming regions. We estimated the [C II] 158 mu m emission from diffuse C II regions and find that upto 95% of the total observed [C II] 158 mu m emission can arise in diffuse C II regions if the temperature of the latter ~ 80 K. Our high-resolution survey data shows that the carbon line emitting regions have structures on angular scale ~ 6 arcmin. Analysis of the dual-resolution observations toward a 2o wide field centered at l = 13.9 deg and toward the longitude range l = 1.75 deg to 6.75 deg shows the presence of narrow (Delta V <= 15 km s-1) carbon line emitting regions extending over several degrees in l and b. The physical size perpendicular to the line-of-sight of an individual diffuse C II region in these directions is >200 pc.

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