1998ApJ...500..129W

New single-dish and millimeter wave interferometer observations of the molecular absorption line system in the gravitational lens to PKS 1830-211 at z = 0.88582 are presented. Self-calibrated interferometer data show unequivocally that the previously detected absorption component is associated with the gravitationally lensed southwest image of the background source. A second absorption line of HCO⁺ (2⟵1) at z = 0.88582 is detected. This component is shifted in velocity by -147 km.s^–1 relative to the main absorption line and is shown to be associated with the northeast image. A few additional absorption lines are presented. Upper limits to absorption and emission lines from the possible absorption system at z = 0.1927, seen in 21 cm H I by Lovell et al., are reported. Alternatively, there could be only one absorbing system at z = 0.88582, with the H I line attributed instead to the PS molecule.