The large-scale distribution of neutral hydrogen in the Fornax region

Waugh, Meryl, Drinkwater, M. J., Webster, R. L., Staveley-Smith, L., Kilborn, V. A., Barnes, D. G., Bhathal, R., de Blok, W. J. G., Boyce, P. J., Disney, M. J., Ekers, R. D., Freeman, K. C., Gibson, B. K., Henning, P. A. and Jerjen, H. (2002) The large-scale distribution of neutral hydrogen in the Fornax region. Monthly Notices of The Royal Astronomical Society, 337 2: 641-656. doi:10.1046/j.1365-8711.2002.05942.x

Author Waugh, Meryl
Drinkwater, M. J.
Webster, R. L.
Staveley-Smith, L.
Kilborn, V. A.
Barnes, D. G.
Bhathal, R.
de Blok, W. J. G.
Boyce, P. J.
Disney, M. J.
Ekers, R. D.
Freeman, K. C.
Gibson, B. K.
Henning, P. A.
Jerjen, H.
Title The large-scale distribution of neutral hydrogen in the Fornax region
Journal name Monthly Notices of The Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 2002-01-01
Year available 2002
Sub-type Article (original research)
DOI 10.1046/j.1365-8711.2002.05942.x
Open Access Status DOI
Volume 337
Issue 2
Start page 641
End page 656
Total pages 16
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Abstract Using data from the H I Parkes All Sky Survey (HIPASS), we have searched for neutral hydrogen in galaxies in a region similar to25x25 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 3sigma lower flux limit of similar to40 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 similar to90 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 30degrees across the search area. At the nominal cluster distance of similar to20 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 similar to500 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 10degrees 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(&PLUSMN;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.
Keyword Astronomy & Astrophysics
Large-scale Structure Of Universe
Radio Lines
Extragalactic Distance Scale
Lmc-type Galaxy
Key Project
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Authors of this document: Waugh, M; Drinkwater, MJ; Webster, RL; Staveley-Smith, L; Kilborn, VA; Barnes, DG; Bhathal, R; de Blok, WJG; Boyce, PJ; Disney, MJ; Ekers, RD; Freeman, KC; Gibson, BK; Henning, PA; Jerjen, H; Knezek, PM; Koribalski, B; Marquarding, M; Minchin, RF; Price, RM; Putman, ME; Ryder, SD; Sadler, EM; Stootman, F; Zwaan, MA. DOI:10.1046/j.1365-8711.2002.05942.x

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
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Created: Mon, 13 Aug 2007, 23:16:59 EST