Query : 2007A&A...467..371C

2007A&A...467..371C - Astronomy and Astrophysics, volume 467, 371-374 (2007/5-3)

Anomalous absorption in c-C3H and c-C3D radicals.


Abstract (from CDS):

The c-C3H radical was first detected in TMC-1 by Yamamoto et al. (1987ApJ...322L..55Y), who observed the 2_1 2–>11 1_ transition at 91.5 GHz in emission. Mangum & Wootten (1990A&A...239..319M) observed the 1_1 0–>11 1_ transition at 14.8 GHz in emission in 12 additional galactic objects. The aim of this investigation is a quantitative estimate of relative line intensities under NLTE conditions. For wide ranges of physical parameters, where these molecules may be found, we have solved a set of statistical equilibrium equations coupled with the equations of radiative transfer in an on-the-spot approximation. For c-C3H, we accounted for 51 energy levels connected by 207 radiative transitions, and for c-C3D, we accounted for 51 energy levels connected by 205 radiative transitions. Our results show that the 3_3 1–>33 0_ transition of c-C3H and c-C3D may be found in absorption against the cosmic microwave background (CMB). Furthermore, we found population inversion for the 1_1 0–>11 1_ transition. These findings may be useful in identifying these molecules in other cosmic objects, as well as for the determination of physical parameters in these objects.

Abstract Copyright:

Journal keyword(s): ISM: molecules - molecular data

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1579 0
2 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2282 0
3 NAME Cas A SNR 23 23 24.000 +58 48 54.00     14.30     ~ 2683 1

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