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Holes and high velocity HI in NGC 6946
Rense Boomsma, Tom Oosterloo, Thijs van der Hulst +2
We are studying the properties of the holes and the high velocity gas in NGC 6946. Here we present some puzzling results.
High Velocity Gas in the Halos of Spiral Galaxies
Filippo Fraternali, Tom Oosterloo, Rense Boomsma +2
Recent, high sensitivity, HI observations of nearby spiral galaxies show that their thin `cold' disks are surrounded by thick layers (halos) of neutral gas with anomalous kinematic…
Tidal Remnants and Intergalactic HII Regions
T. Oosterloo, R. Morganti, E. M. Sadler +3
We report the discovery of two small intergalactic HII regions in the loose group of galaxies around the field elliptical NGC 1490. The HII regions are located at least 100 kpc fro…
Gas outflows in radio galaxies
R. Morganti, T. Oosterloo, B. H. C. Emonts +2
We present a summary of our recent results on gas outflows in radio galaxies. Fast outflows (up to 2000 km/s) have been detected both in ionized and neutral gas. The latter is part…
HI on large and small scales in starburst radio galaxies
Raffaella Morganti, Tom Oosterloo, Clive Tadhunter +2
The study of the optical continuum of radio galaxies shows that about 30% have a young stellar population component. Among them are the most far-IR bright radio galaxies. A further…
Fast outflow of neutral hydrogen in the radio galaxy 3C293
R. Morganti, T. A. Oosterloo, B. H. C. Emonts +2
We report the detection of very broad HI absorption against the central regions of the radio galaxy 3C293. The absorption profile, obtained with the Westerbork Synthesis Radio Tele…
The 1000 Brightest HIPASS Galaxies: HI Mass Function and Omega_HI
M. A. Zwaan, L. Staveley-Smith, B. S. Koribalski +37
We present a new accurate measurement of the HI mass function of galaxies from the HIPASS Bright Galaxy Catalog, a sample of 1000 galaxies with the highest HI peak flux densities i…
Large-scale HI structures and the origin of radio galaxies
R. Morganti, T. Oosterloo, C. Tadhunter +1
We present the first results of a study aimed to detect large HI structures in radio galaxies. In two of the three cases presented (Coma A and B2 0648+27), the detection of a large…