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Title:
A search for moderate redshift CO absorption
Authors:
Douglas, N. G.; Radford, S. J. E.; Roland, J.; Webb, J. K.
Affiliation:
AA(Groningen State Univ., Netherlands), AB(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AC(CNRS, Inst. d'Astrophysique, Paris, France), AD(New South Wales Univ., Kensington, Australia)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 1, p. 8-12. (A&A Homepage)
Publication Date:
08/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ABSORPTION SPECTRA, CARBON MONOXIDE, INTERSTELLAR GAS, MOLECULAR CLOUDS, RED SHIFT, LINE SPECTRA, QUASARS, RADIO SPECTRA
Bibliographic Code:
1992A&A...262....8D

Abstract

We searched for mm CO absorption lines towards four QSOs, 0235 + 164, 0420 - 014, 1243 - 072, and 2128 - 123, at the absolute redshifts (0.4-0.65) of known heavy element absorption systems. Although no absorption features were detected, our upper limits on CO column density, less than 2 x 10 exp 15/sq cm, are low enough to rule out the existence along these lines of sight of any of the richer diffuse molecular clouds seen in the Galaxy.

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