Publications

A search for H I and OH absorption in z ≥ 3 CO emitters

Curran, S. J.; Allison, J. R.; Whiting, M. T.; Sadler, E. M.; Combes, F.; Pracy, M. B.; Bignell, C.; Athreya, R.

We present the results of a survey for H I 21 cm and OH 18 cm absorption in seven strong CO emitters at z ≥ 3. Despite reaching limits comparable to those required to detect 21 cm absorption at lower redshifts, we do not detect either transition in any of the objects searched. We believe that this is due to the high-redshift selection causing all of our targets to have ultraviolet (UV) luminosities above the critical value, where all of the atomic gas in the host galaxy disc is suspected to be ionized. However, not only are all of our targets bright in CO emission, but detection of CO above the critical UV luminosity is generally not uncommon. This suggests that the molecular gas is shielded from the radiation or is physically remote from the source of the continuum emission, as it appears to be from CO observations of high-redshift radio galaxies.

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Matthew Whiting
Address:
Australia Telescope National Facility
PO Box 76, Epping,
NSW 1710,
Australia
Email:
Matthew.Whiting <at> csiro.au
ph: +61-2-9372-4683
fax: +61-2-9372-4444
Location:
You can now find me in room 99 at Epping.

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