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21-cm synthesis observations of VIRGOHI 21 - a possible dark galaxy in the Virgo Cluster
Robert Minchin, Jonathan Davies, Michael Disney +10
Many observations indicate that dark matter dominates the extra-galactic Universe, yet no totally dark structure of galactic proportions has ever been convincingly identified. Prev…
The HIPASS Catalogue: III - Optical Counterparts & Isolated Dark Galaxies
Marianne T. Doyle, M. J. Drinkwater, D. J. Rohde +38
We present the largest catalogue to date of optical counterparts for HI radio-selected galaxies, Hopcat. Of the 4315 HI radio-detected sources from the HI Parkes All Sky Survey (Hi…
A Dark Hydrogen Cloud in the Virgo Cluster
Robert Minchin, Jonathan Davies, Michael Disney +8
VIRGOHI21 is an HI source detected in the Virgo Cluster survey of Davies et al. (2004) which has a neutral hydrogen mass of 10^8 M_solar and a velocity width of Delta V_20 = 220 km…
The cosmological significance of Low Surface Brightness galaxies found in a deep blind neutral-hydrogen survey
R. F. Minchin, M. J. Disney, Q. A. Parker +16
We have placed limits on the cosmological significance of gas-rich low surface-brightness (LSB) galaxies as a proportion of the total population of gas-rich galaxies by carrying ou…
HIDEEP - An extragalactic blind survey for very low column-density neutral hydrogen
R. F. Minchin, M. J. Disney, P. J. Boyce +13
We have carried out an extremely long integration-time (9000 s/beam) 21-cm blind survey of 60 square degrees in Centaurus using the Parkes multibeam system. We find that the noise…
First Results from the HI Jodrell All Sky Survey: Inclination-Dependent Selection Effects in a 21-cm Blind Survey
R. H. Lang, P. J. Boyce, V. A. Kilborn +8
Details are presented of the HI Jodrell All Sky Survey (HIJASS). HIJASS is a blind neutral hydrogen (HI) survey of the northern sky, being conducted using the multibeam receiver on…