6 papers · 1 filter
Molecular absorption lines at high redshift
Tommy Wiklind, Francoise Combes
The four known molecular absorption line systems at redshifts z0.25--0.89 are discussed. Two of the systems originate in the galaxy hosting the `background' AGN, while in two ca…
Molecular lines in absorption: recent results
F. Combes, T. Wiklind
Some recent results are presented about high redshift molecular absorption lines, namely about chemical abundances of elements, and in particular of water and molecular oxygen. Exc…
New upper limits on the interstellar O2 abundance
F. Combes, T. Wiklind, N. Nakai +3
We report new observations of molecular oxygen in absorption at z=0.685 in front of the radio source B0218+357. The lines at 56.3 and 118.7 GHz have been observed, redshifted to 33…
Molecular absorption lines at high redshift: PKS1413+135 (z=0.247)
Tommy Wiklind, Francoise Combes
A detailed study of the absorbing molecular clouds towards the radio source PKS1413+135, at a redshift z=0.247, is reported. Physical conditions are derived for the molecular gas i…
Molecular gas in the elliptical galaxy NGC759. Interferometric CO observations
Tommy Wiklind, Francoise Combes, Christian Henkel +1
Interferometric observations of the CO(1-0) line in the elliptical galaxy NGC759 shows that it contains 2 10^9 Mo of molecular gas, confined to a circumnuclear ring with an average…
Molecular absorption and its time variations in Cen A
Tommy Wiklind, Francoise Combes
New high-quality absorption spectra of J=0-1 HCO+, HCN, HNC and the J=1-2 line of CS towards the radio core of Cen A are presented and analysed. In addition, the J=0-1 line of of H…