Where has all the neutral hydrogen gone?

Details Where has all the neutral hydrogen gone? Where has all the neutral hydrogen gone?

2002-11-13

arxiv.org/abs/astro-ph/0211288v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, to be published in the proceedings of "The IGM/Galaxy Connection"

Scientific paper

Our extremely deep survey for extragalactic HI (HIDEEP) finds no intergalactic gas clouds, and no galaxies with HI at inferred global column-densities below 10^20 cm^-2 when we could have detected such objects down to a completeness limit of 4 x 10^18 cm^-2. We speculate that low surface-density hydrogen is either ionised or locked up in ``frozen discs'', i.e. structures where the local Ly-alpha is insufficient to excite the 21-cm transition to a spin-temperature above the cosmic background. Such ``frozen discs'' might be responsible for many QSOALSs.

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