Giant Metrewave Radio Telescope limits on cool HI in galaxy groups

Details Giant Metrewave Radio Telescope limits on cool HI in galaxy groups Giant Metrewave Radio Telescope limits on cool HI in galaxy groups

2006-11-27

arxiv.org/abs/astro-ph/0611798v1

Bull.Astron.Soc.India 34 (2006) 375-383

Astronomy and Astrophysics

Astrophysics

9 pages, accepted by the Bulletin of the Astronomical Society of India

Scientific paper

We present Giant Metrewave Radio Telescope 21-cm HI observations towards a sample of compact radio sources behind galaxy groups, to search for cool HI. The results -- from high dynamic range spectra for 8 lines-of-sight through 7 galaxy groups -- do not show any evidence for absorption by cool HI. At a resolution of 20 km/s, the optical depth upper limits obtained were between 0.0075 and 0.035 (3sigma); these correspond to upper limits of a few times 10**23 m**-2 for the column density of any cool HI along these lines of sight (assuming a spin temperature of 100 K).

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