A 22GHz search for molecular absorption at z~3 with the upgraded ATCA

Details A 22GHz search for molecular absorption at z~3 with the upgraded ATCA A 22GHz search for molecular absorption at z~3 with the upgraded ATCA

2002-11-18

arxiv.org/abs/astro-ph/0211387v1

Mon.Not.Roy.Astron.Soc. 340 (2003) 139

Astronomy and Astrophysics

Astrophysics

5 pages, 3 EPS figures, 2 tables, accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06273.x

We report a lambda > 1cm search for rotational molecular absorption towards quasars, now possible with the upgraded Australia Telescope Compact Array (ATCA). The targets were PKS 0201+113, PKS 0336-017 and Q 0537-286, where known damped Lyman-alpha absorption systems (DLAs) could cause redshifted molecular absorption in the 12mm band of the telescope. We place 3-sigma upper limits on any HCO+ 0-1 absorption features of < 30mJy per 3.4km/s channel. The non-detections could be attributed to the inherent low metallicities in DLAs leading to generally low H_2, and thus HCO+, column densities. In general, the detection of molecular rotational transitions in DLAs could be further hindered by a lower than expected CO-to-H_2 conversion ratio, whether due either to photoionization of carbon or its relative under-abundance at high redshift.

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