A search for high redshift molecular absorption lines toward millimetre-loud, optically faint quasars

Details A search for high redshift molecular absorption lines toward millimetre-loud, optically faint quasars A search for high redshift molecular absorption lines toward millimetre-loud, optically faint quasars

2003-03-04

arxiv.org/abs/astro-ph/0303074v1

Mon.Not.Roy.Astron.Soc. 342 (2003) 830

Astronomy and Astrophysics

Astrophysics

8 pages, 7 EPS figures, 3 tables, accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06586.x

We describe initial results of a search for redshifted molecular absorption toward four millimetre-loud, optically faint quasars. A wide frequency bandwidth of up to 23 GHz per quasar was scanned using the Swedish-ESO Sub-millimetre Telescope at La Silla. Using a search list of commonly detected molecules, we obtained nearly complete redshift coverage up to z_abs=5. The sensitivity of our data is adequate to have revealed absorption systems with characteristics similar to those seen in the four known redshifted millimetre-band absorption systems, but none were found. Our frequency-scan technique nevertheless demonstrates the value of wide-band correlator instruments for searches such as these. We suggest that a somewhat larger sample of similar observations should lead to the discovery of new millimetre-band absorption systems.

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