SIMBAD references

2013MNRAS.428.1107W - Mon. Not. R. Astron. Soc., 428, 1107-1115 (2013/January-2)

Detection of interstellar C2 and C3 in the Small Magellanic Cloud.


Abstract (from CDS):

We report the detection of absorption from interstellar C2 and C3 towards the moderately reddened star Sk 143, located in the near `wing' region of the SMC, in optical spectra obtained with the European Southern Observatory Very Large Telescope (VLT)/Ultraviolet and Visual Echelle Spectrograph. These detections of C2 (rotational levels J = 0-8) and C3 (J = 0-12) absorption in the SMC are the first beyond our Galaxy. The total abundances of C2 and C3 (relative to H2) are similar to those found in diffuse Galactic molecular clouds - as previously found for CH and CN - despite the significantly lower average metallicity of the Small Magellanic Cloud. Analysis of the rotational excitation of C2 yields an estimated kinetic temperature Tk ∼ 25K and a moderately high total hydrogen density nH ∼ 870 cm-3 - compared to the T01 ∼ 45K and nH ∼ 85-300 cm-3 obtained from H2. The populations of the lower rotational levels of C3 are consistent with an excitation temperature of about 34 K.

Abstract Copyright: © 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2012)

Journal keyword(s): ISM: molecules - ISM: lines and bands - galaxies: ISM - Magellanic Clouds

Simbad objects: 16

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