Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-17
Astronomy and Astrophysics
Astrophysics
22 pages, 10 figs, Accepted for publication in Astronomy & Astrophysics
Scientific paper
In earlier papers (Roshi & Anantharamaiah 2000, 2001a), we presented extensive surveys (angular resolution -- 2\deg $\times$ 2\deg & 2\deg $\times$ 6\arcmin) of radio recombination lines (RRLs) near 327 MHz in the longitude range $l = $ 332\deg $\to$ 89\deg using the Ooty Radio Telescope. These surveys have detected carbon lines mostly between $l = $ 358\deg $\to$ 20\deg 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'' \CII regions. The \lv diagram and radial distribution constructed from our carbon line data shows similarity with that obtained from hydrogen recombination lines at 3 cm from \HII regions indicating that the distribution of the diffuse \CII regions in the inner Galaxy resembles the distribution of the star-forming regions. We estimated the [CII] 158 micron emission from diffuse \CII regions and find that upto 95 % of the total observed [CII] 158 micron emission can arise in diffuse \CII regions if the temperature of the latter $\sim 80$ K. Our high-resolution survey data shows that the carbon line emitting regions have structures on angular scale $\sim$ 6\arcmin. Analysis of the dual-resolution observations toward a 2\deg wide field centered at $l = $ 13\deg.9 and toward the longitude range $l = $ 1\deg.75 to 6\deg.75 shows the presence of narrow ($\Delta V \le $ 15 \kms) 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 \CII region in these directions is $>$ 200 pc.
Anantharamaiah K. R.
Anish Roshi D.
Kantharia Nimisha G.
No associations
LandOfFree
Carbon Recombination Lines near 327 MHz I: "Diffuse" CII regions in the Galactic Disk does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Carbon Recombination Lines near 327 MHz I: "Diffuse" CII regions in the Galactic Disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carbon Recombination Lines near 327 MHz I: "Diffuse" CII regions in the Galactic Disk will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-603431