IRAM observations of JVAS/CLASS gravitational lenses |
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| Authors: | E Xanthopoulos F Combes T Wiklind |
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| Institution: | ;1University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL;2DEMIRM, Observatoire de Paris, 61 Av. de l'Observatoire, F-75014 Paris, France;3Onsala Space Observatory, S-43992 Onsala, Sweden |
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| 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 15 K, to be N CO<6.3×1013 cm−2 and N HCO+<1.3×1011 cm−2 , equivalent to hydrogen column density of the order N H<1018 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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| Keywords: | gravitational lensing cosmology: observations |
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