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28 March 2024
 
  » arxiv » astro-ph/0210170

 Article overview


The Large Scale Distribution of Neutral Hydrogen in the Fornax Region
Meryl Waugh ; M. J. Drinkwater ; R. L. Webster ; L. Staveley-Smith ; V. A. Kilborn ; D. G. Barnes ; R. Bhathal ; W. J. G. de Blok ; P. J. Boyce ; M. J. Disney ; R. D. Ekers ; K. C. Freeman ; B. K. Gibson ; P. A. Henning ; H. Jerjen ; P. M. Knezek ; B. Koribalski ; M. Marquarding ; R. F. Minchin ; R. M. Price ; M. E. Putman ; S. D. Ryder ; E. M. Sadler ; F. Stootman ; M. A. Zwaan ;
Date 8 Oct 2002
Journal Mon.Not.Roy.Astron.Soc. 337 (2002) 641
Subject astro-ph
AbstractUsing HIPASS data, we have searched for HI in a ~25x25 sq.deg. region centred on the Fornax cluster. Within a velocity search range of 300 - 3700 km/s and a lower flux limit of ~40 mJy, 110 galaxies with HI emission were detected, one of which is previously uncatalogued. None of the detections has early-type morphology. Previously unknown velocities for 14 galaxies have been determined, with a further 4 velocity measurements being significantly dissimilar to published values. Identification of an optical counterpart is relatively unambiguous for more than ~90% of our HI galaxies. The galaxies appear to be embedded in a sheet at the cluster velocity which extends for more than 30 deg across the search area. At the nominal cluster distance of ~20 Mpc, this corresponds to an elongated structure more than 10 Mpc in extent. A velocity gradient across the structure is detected, with radial velocities increasing by ~500 km/s from SE to NW. The clustering of galaxies evident in optical surveys is only weakly suggested in the spatial distribution of our HI detections. Our results suggest a considerable deficit of HI-rich galaxies in the centre of the cluster. However, relative to the field, there is a 3(+/-1)-fold excess of HI-rich galaxies in the outer parts of the cluster where galaxies may be infalling towards the cluster for the first time.
Source arXiv, astro-ph/0210170
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