SIMBAD references

2001MNRAS.325..273X - Mon. Not. R. Astron. Soc., 325, 273-277 (2001/July-3)

IRAM observations of JVAS/CLASS gravitational lenses.

XANTHOPOULOS E., COMBES F. and WIKLIND T.

Abstract (from CDS):

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<6.3x1013cm–2 and NHCO+<1.3x1011cm–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.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): gravitational lensing - cosmology: observations

Simbad objects: 16

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