NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-07-21 T04:17:22 PDT
Help | Comment | NED Home

For refcode 2002MNRAS.337..641W:
Retrieve 112 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 2002MNRAS.337..641W 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 and M. A. Zwaan ABSTRACT Using data from the H I Parkes All Sky Survey (HIPASS), we have searched for neutral hydrogen in galaxies in a region ~25 x 25 deg^2^ centred on NGC 1399, the nominal centre of the Fornax cluster. Within a velocity search range of 300-3700 km s^-1^ and to a 3 {sigma} lower flux limit of ~40 mJy, 110 galaxies with H I 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 four velocity measurements being significantly dissimilar to published values. Identification of an optical counterpart is relatively unambiguous for more than ~90 per cent of our H I 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^-1^ from south-east to north-west. The clustering of galaxies evident in optical surveys is only weakly suggested in the spatial distribution of our H I detections. Of 62 H I detections within a 10^deg^ projected radius of the cluster centre, only two are within the core region (projected radius <1^deg^) and less than 30 per cent are within 3.5^deg^, suggesting a considerable deficit of H I-rich galaxies in the centre of the cluster. However, relative to the field, there is a 3(+/-1)-fold excess of H I-rich galaxies in the outer parts of the cluster where galaxies may be infalling towards the cluster for the first time. Key words: surveys - galaxies: clusters: individual: Fornax - galaxies: evolution - large-scale structure of Universe - radio lines: galaxies.
Retrieve 112 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home