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Issue A&A
Volume 367, Number 1, February III 2001
Page(s) 46 - 50
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20000420



A&A 367, 46-50 (2001)
DOI: 10.1051/0004-6361:20000420

ATCA search for 21 cm emission from a candidate damped Ly-$\alpha$ absorber at ${\vec z} = 0.101$

N. Kanekar1, J. N. Chengalur1, 2, R. Subrahmanyan3 and P. Petitjean4

1  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: chengalu@ncra.tifr.res.in
3  Australia Telescope National Facility, CSIRO, Locked bag 194, Narrabri, NSW 2390, Australia
    e-mail: rsubrahm@atnf.csiro.au
4  Institut d'Astrophysique de Paris - CNRS, 98bis Boulevard Arago, 75014 Paris, France
    e-mail: ppetitje@iap.fr

(Received 19 October 2000 / Accepted 1 December 2000)

Abstract
We report a deep search for 21 cm emission/absorption from the $z \sim 0.101$ candidate damped Lyman-$\alpha$ system towards PKS 0439-433, using the Australia Telescope Compact Array (ATCA). The spectrum shows a weak absorption feature -at the $3.3 \sigma$ level -which yields a lower limit of 730 K on the spin temperature of the system. No H I emission was detected: the $3\sigma$ upper limit on the H I mass of the absorber is 2.25 10 $^9 M_{\odot}$, for a velocity spread of $\sim$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

Offprint request: N. Kanekar, nissim@ncra.tifr.res.in

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© ESO 2001


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