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http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2692| Title: | Molecular Carbon Chains and Rings in TMC-1 |
| Keywords: | Subject headings: ISM: abundances ISM: individual (TMC-1) ISM: molecules Molecular processes |
| Publisher: | American Astronomical Society |
| Description: | 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. Peer reviewed |
| URI: | http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2692 |
| Other Identifiers: | arXiv:astro-ph/0012405v1 The Astrophysical Journal, 552:168–174, 2001 May 1 1538-4357 http://hdl.handle.net/10261/2692 10.1086/320471 |
| Appears in Collections: | Digital Csic |
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