Volume 367, Number 1, February III 2001
|Page(s)||46 - 50|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 February 2001|
ATCA search for 21 cm emission from a candidate damped Ly-α absorber at
National Centre for Radio Astrophysics, Post Bag 3, Ganeshkhind, Pune 411 007, India
2 Visiting Scientist, NFRA, PO Bus 2, 7990 AA Dwingeloo, The Netherlands e-mail: email@example.com
3 Australia Telescope National Facility, CSIRO, Locked bag 194, Narrabri, NSW 2390, Australia e-mail: firstname.lastname@example.org
4 Institut d'Astrophysique de Paris - CNRS, 98bis Boulevard Arago, 75014 Paris, France e-mail: email@example.com
Corresponding author: N. Kanekar, firstname.lastname@example.org
Accepted: 1 December 2000
We report a deep search for 21 cm emission/absorption from the candidate damped Lyman-α system towards PKS 0439-433, using the Australia Telescope Compact Array (ATCA). The spectrum shows a weak absorption feature -at the level -which yields a lower limit of 730 K on the spin temperature of the system. No H i emission was detected: the upper limit on the H i mass of the absorber is 2.25 10, for a velocity spread of ∼70 km s-1. The low H i mass and the high spin temperature seem to rule out the possibility that the absorber is a large gas-rich spiral galaxy.
Key words: cosmology: observations / galaxies: individual: PKS 0439 / 433 / radio lines: general
© ESO, 2001
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