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Title:
IRAM observations of JVAS/CLASS gravitational lenses
Authors:
Xanthopoulos, E.; Combes, F.; Wiklind, T.
Affiliation:
AA(University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL), AB(DEMIRM, Observatoire de Paris, 61 Av. de l'Observatoire, F-75014 Paris, France), AC(Onsala Space Observatory, S-43992 Onsala, Sweden)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 325, Issue 1, pp. 273-277. (MNRAS Homepage)
Publication Date:
07/2001
Origin:
MNRAS
Astronomy Keywords:
GRAVITATIONAL LENSING, COSMOLOGY: OBSERVATIONS
DOI:
10.1046/j.1365-8711.2001.04414.x
Bibliographic Code:
2001MNRAS.325..273X

Abstract

We have searched for molecular absorption lines at millimetre wavelengths in 11 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-mm bands 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 15K, to be NCO<6.3×1013cm-2 and NHCO+<1.3×1011cm-2, equivalent to hydrogen column density of the order NH<1018cm-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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