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An HI survey of the Centaurus and Sculptor Groups - Constraints on the space density of low mass galaxies
W. J. G. de Blok, M. A. Zwaan, M. Dijkstra +2
We present results of two 21-cm HI surveys performed with the Australia Telescope Compact Array in the nearby Centaurus A and Sculptor galaxy groups. These surveys are sensitive to…
Reconciling Damped Ly-alpha Statistics and 21cm Studies at z=0
Martin Zwaan, Frank Briggs, Marc Verheijen
Blind 21cm surveys in the local universe have shown that the local HI mass density, Omega_HI, is dominated by luminous, high surface brightness, spiral galaxies. On the other hand,…
HI Observations of the starburst galaxy NGC 2146
A. Taramopoulos, H. Payne, F. H. Briggs
NGC 2146 is a peculiar spiral galaxy which is currently undergoing a major burst of star formation and is immersed in a extended HI structure that has morphological and kinematical…
Nancay blind 21cm line survey of the Canes Venatici group region
R. C. Kraan-Korteweg, W. van Driel, F. Briggs +2
A radio spectroscopic driftscan survey in the 21cm line with the Nancay Radio Telescope of 0.08 steradians of sky in the direction of the constellation Canes Venatici covering a he…
Estimation of the Space Density of Low Surface Brightness Galaxies
F. H. Briggs
The space density of low surface brightness and tiny gas-rich dwarf galaxies are estimated for two recent catalogs: The Arecibo Survey of Northern Dwarf and Low Surface Brightness…
Local HI: Constraints on the evolution of the HI content of the Universe
F. H. Briggs
Analyses of QSO absorption lines are showing that HI content has evolved over the redshift range z=5 to z= 0. The 21cm line measurements of the z=0 HI content avoid several biases…
Driftscan Surveys in the 21cm Line with the Arecibo and Nancay Telescopes
F. H. Briggs, E. Sorar, R. C. Kraan-Korteweg +1
Driftscan methods are highly efficient, stable techniques for conducting extragalactic surveys in the 21cm line of neutral hydrogen. Holding the telescope still while the beam scan…