21-cm absorbers at intermediate redshifts

Details 21-cm absorbers at intermediate redshifts 21-cm absorbers at intermediate redshifts

2009-02-17

arxiv.org/abs/0902.3016v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 3 figures; to appear in proceedings of "Low Frequency Radio Universe" conference (Pune, India, 8-12 December 2008)

Scientific paper

Damped Lyman-alpha systems (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 21-cm absorption in the spectra of background quasars. Here we report the main results of our GMRT survey to search for 21-cm absorption in a representative and unbiased sample of 35 DLA candidates at 1.10

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