Giant Metrewave Radio Telescope limits on cool HI in galaxy groups

B. Nikolic; D. A. Green; H. Cullen; M. S. Clemens; P. Alexander

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Giant Metrewave Radio Telescope limits on cool HI in galaxy groups

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arxiv astro-ph/0611798 v1 pith:P7NE34IU submitted 2006-11-27 astro-ph

D. A. Green , M. S. Clemens , P. Alexander , H. Cullen , B. Nikolic This is my paper

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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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