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Query : 1998ApJ...508..286B |
1998ApJ...508..286B - Astrophys. J., 508, 286-290 (1998/November-3)
The excitation temperatures of HC9N and other long cyanopolyynes in TMC-1.
BELL M.B., WATSON J.K.G., FELDMAN P.A. and TRAVERS M.J.
Abstract (from CDS):
The rate of radiative cooling is less efficient in the longer cyanopolyyne chains and is approximately proportional to (n + 1)–6, where n is the number of carbon atoms in the chain. In steady state this is balanced by the collisional rate of excitation. The rotational temperatures of the cyanopolyynes are found to increase with the number of heavy atoms over the range HC5N-HC9N, in reasonable agreement with calculations. Concomitantly, we find evidence that the longer cyanopolyynes are located in regions that become progressively smaller with chain length.
We also report newly measured values for the rotational and centrifugal distortion constants of HC9N that improve the accuracy of the calculated millimeter wave transitions.
Abstract Copyright: ∼
Journal keyword(s): ISM: Individual: Name: Taurus Molecular Cloud - ISM: Molecules - Molecular Data - Molecular Processes - Radio Lines: ISM
Simbad objects: 2
Number of rows : 2 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | NAME Taurus Complex | SFR | 04 41.0 | +25 52 | ~ | 4414 | 0 | |||||
2 | TMC-1 | MoC | 04 41 45.9 | +25 41 27 | ~ | 1674 | 0 |
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