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Where has all the neutral hydrogen gone? | M. J. Disney
; R. F. Minchin
; | Date: |
13 Nov 2002 | Subject: | astro-ph | Affiliation: | Cardiff University | Abstract: | 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. | Source: | arXiv, astro-ph/0211288 | Services: | Forum | Review | PDF | Favorites |
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