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Issue A&A
Volume 394, Number 3, November II 2002
Page(s) 763 - 768
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20021231



A&A 394, 763-768 (2002)
DOI: 10.1051/0004-6361:20021231

A search for molecules in damped Lyman-alpha absorbers occulting millimetre-loud quasars

S. J. Curran1, M. T. Murphy1, J. K. Webb1, F. Rantakyrö2, 3, L. E. B. Johansson4 and S. Nikolic4, 5

1  School of Physics, University of New South Wales, Sydney NSW 2052, Australia
2  European Southern Observatory, Casilla 19001, Santiago 19, Chile
3  Observatorio Cerro Calan, Universidad de Chile, Santiago, Chile
4  Onsala Space Observatory, Chalmers University of Technology, 439 92 Onsala, Sweden
5  Astronomical Observatory, Volgina 7, 11160 Belgrade, Serbia

(Received 21 June 2002 / Accepted 27 August 2002 )

Abstract
We have used the SEST 15-metre and Onsala 20-metre telescopes to perform deep ( $\rm rms \ga30$ mJy) integrations of various molecular rotational transitions towards damped Lyman-alpha absorption systems (DLAs) known to occult millimetre-loud quasars. We have observed 6 new systems and improved the existing limits for 11 transitions. These limits may be approaching the sensitivities required to detect new systems and we present a small number of candidate systems which we believe warrant further observation.


Key words: quasars: absorption lines -- cosmology: observations -- cosmology: early Universe

Offprint request: S. Curran, sjc@bat.phys.unsw.edu.au

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