IRAM observations of JVAS/CLASS gravitational lenses

Details IRAM observations of JVAS/CLASS gravitational lenses IRAM observations of JVAS/CLASS gravitational lenses

2000-10-23

arxiv.org/abs/astro-ph/0010454v1

Mon.Not.Roy.Astron.Soc. 325 (2001) 273

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure, to appear in MNRAS

Scientific paper

10.1046/j.1365-8711.2001.04414.x

We have searched for molecular absorption lines at millimeter wavelengths in eleven gravitational lens systems discovered in the JVAS/CLASS surveys of flat spectrum radio sources. Spectra of only one source 1030+074 were obtained in the 3-, 2- and 1.3-millimeter band at the frequencies corresponding to common molecular transitions of CO and HCO+ as continuum emission was not found in any of the other sources. We calculated upper limits to the column density in molecular absorption for 1030+074, using an excitation temperature of 15 K, to be N_{CO} < 6.3 x 10^{13} cm^{-2} and N_{HCO+} < 1.3 x 10^{11} cm^{-2}, equivalent to hydrogen column density of the order N_H < 10^{18} cm^{-2}, assuming standard molecular abundances. We also present the best upper limits of the continuum at the lower frequency for the other 10 gravitational lenses.

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