Search for radio recombination lines towards the gravitational lens PKS 1830-211

Details Search for radio recombination lines towards the gravitational lens PKS 1830-211 Search for radio recombination lines towards the gravitational lens PKS 1830-211

2000-04-21

arxiv.org/abs/astro-ph/0004307v1

Astronomy and Astrophysics

Astrophysics

2 pages with 2 figures, Latex format, to appear in the proceedings of IAU 199, "The Universe at Low Radio Frequencies" held in

Scientific paper

A search for radio recombination lines near 20 cm at z=0.193 and z=0.886 towards the gravitational lens system PKS 1830-211 has yielded upper limits on the line optical depth of 5 x 10^{-5} and 5 x10^{-4} at the two redshifts respectively. Based on the non-detections, we derive upper limits to the emission measure of the ionized gas in the absorbing systems. We also present continuum flux density measurements over the frequency range 0.3-45 GHz made at a single epoch.

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