|The Australia Telescope National Facility Colloquium|
|15:30-16:30 Wed 14 May 2008|
ATNF Marsfield Lecture Theatre
(Australia Telescope National Facility)
GMRT survey of 21cm absorption in DLA candidates at intermediate redshift - Neeraj Gupta Colloquium
Damped Lyman-alpha absorbers (DLAs) seen in the spectra of high-z QSOs allow us to probe the physical conditions in protogalaxies. Our understanding of physical conditions in DLAs at high-z is primarily based on the absorption lines of H_2 molecules and fine-structure transitions. Another important way of probing the thermal state of interstellar medium in these systems is by studying the 21cm absorption in the spectra of background quasars. We are doing systematic searches for 21cm absorption in complete samples of
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