| Issue |
A&A
Volume 394, Number 3, November II 2002
|
|
|---|---|---|
| Page(s) | 763 - 768 | |
| Section | Astrophysical processes | |
| DOI | https://doi.org/10.1051/0004-6361:20021231 | |
| Published online | 21 October 2002 | |
A search for molecules in damped Lyman-alpha absorbers occulting millimetre-loud quasars*
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
Corresponding author: S. Curran, sjc@bat.phys.unsw.edu.au
Received:
21
June
2002
Accepted:
27
August
2002
We have used the SEST 15-metre and Onsala 20-metre
telescopes to perform deep (
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
© ESO, 2002
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