Molecular Carbon Chains and Rings in TMC-1

Details Molecular Carbon Chains and Rings in TMC-1 Molecular Carbon Chains and Rings in TMC-1

2000-12-19

arxiv.org/abs/astro-ph/0012405v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in The Astrophysical Journal, part I. 24 pages, including 4 tables, 7 figures, and figure captions

Scientific paper

10.1086/320471

We present mapping results in several rotational transitions of HC3N, C6H, both cyclic and linear C3H2 and C3H, towards the cyanopolyyne peak of the filamentary dense cloud TMC-1 using the IRAM 30m and MPIfR 100m telescopes. The spatial distribution of the cumulene carbon chain propadienylidene H2C3 (hereafter l-C3H2) is found to deviate significantly from the distributions of the cyclic isomer c-C3H2, HC3N, and C6H which in turn look very similar. The cyclic over linear abundance ratio of C3H2 increases by a factor of 3 across the filament, with a value of 28 at the cyanopolyyne peak. This abundance ratio is an order of magnitude larger than the range (3 to 5) we observed in the diffuse interstellar medium. The cyclic over linear abundance ratio of C3H also varies by ~2.5 in TMC-1, reaching a maximum value (13) close to the cyanopolyyne peak. These behaviors might be related to competitive processes between ion-neutral and neutral-neutral reactions for cyclic and linear species.

Affiliated with

Also associated with

No associations

Rating

Molecular Carbon Chains and Rings in TMC-1 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 Molecular Carbon Chains and Rings in TMC-1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular Carbon Chains and Rings in TMC-1 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-255909