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Title:
A search for molecules in damped Lyman-alpha absorbers occulting millimetre-loud quasars
Authors:
Curran, S. J.; Murphy, M. T.; Webb, J. K.; Rantakyrö, F.; Johansson, L. E. B.; Nikolić, S.
Affiliation:
AA(School of Physics, University of New South Wales, Sydney NSW 2052, Australia), AB(School of Physics, University of New South Wales, Sydney NSW 2052, Australia), AC(School of Physics, University of New South Wales, Sydney NSW 2052, Australia), AD(European Southern Observatory, Casilla 19001, Santiago 19, Chile; Observatorio Cerro Calan, Universidad de Chile, Santiago, Chile), AE(Onsala Space Observatory, Chalmers University of Technology, 439 92 Onsala, Sweden), AF(Onsala Space Observatory, Chalmers University of Technology, 439 92 Onsala, Sweden; Astronomical Observatory, Volgina 7, 11160 Belgrade, Serbia)
Publication:
Astronomy and Astrophysics, v.394, p.763-768 (2002) (A&A Homepage)
Publication Date:
11/2002
Origin:
A&A
A&A Keywords:
quasars: absorption lines, cosmology: observations, cosmology: early Universe
DOI:
10.1051/0004-6361:20021231
Bibliographic Code:
2002A&A...394..763C

Abstract

We have used the SEST 15-metre and Onsala 20-metre telescopes to perform deep (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. Based on results collected at Onsala Space Observatory, Sweden and the European Southern Observatory, La Silla, Chile.
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