M. J. Drinkwater, J. B. Jones, M. D. Gregg, S. Phillipps, PASA, 17 (3), 227.
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Discovery Observations: The Fornax Spectroscopic Survey
Our Fornax Spectroscopic Survey, carried out with the 2dF multi-object spectrograph on the Anglo-Australian Telescope (see Drinkwater et al. 2000), is now 87% complete in its first field to a limit of BJ=19.7. The 2dF field is a circle of diameter 2 degrees (i.e. 
square degrees of sky). We have measured optical spectra of some 4000 objects (some going fainter than our nominal limit) in a 2dF field centred on the central galaxy of the Fornax Cluster (NGC 1399). This survey is unique in that the targets (selected from digitised UK Schmidt Telescope photographic sky survey plates) include all objects, both unresolved (``stars'') and resolved (``galaxies'') in this large area of sky. The resolved objects measured are mostly background galaxies as expected with a minor contribution from Fornax Cluster members. The unresolved objects are mostly Galactic stars and distant AGN, also as expected, but some are compact starburst (and post-starburst) galaxies beyond the Fornax Cluster (Drinkwater et al 1999a).
Finally, in addition to the dwarf galaxies already listed in the Fornax Cluster Catalog (FCC: Ferguson 1989) which we have confirmed as cluster members, we have found a sample of five very compact objects at the cluster redshift which are unresolved on photographic sky survey plates and not included in the FCC. These new members of the Fornax Cluster are listed in Tableá 1 along with their photometry measured from the UKST plates.
| N. | Name | RA (J2000) Dec | BJ | MB | cz | Notes |
| á | á | á | (mag) | (mag) | (
| á |
| 1 | FCSS J033703.3-353804 | 03 37 03.30 -35 38 04.6 | 19.85 | -11.1 | 1507 | á |
| 2 | FCSS J033806.3-352858 | 03 38 06.33 -35 28 58.8 | 18.85 | -12.1 | 1328 | á |
| 3 | FCSS J033854.1-353333 | 03 38 54.10 -35 33 33.6 | 17.68 | -13.2 | 1595 | 1 |
| 4 | FCSS J033935.9-352824 | 03 39 35.95 -35 28 24.5 | 18.82 | -12.1 | 1936 | 2 |
| 5 | FCSS J033952.5-350424 | 03 39 52.58 -35 04 24.1 | 19.66 | -11.2 | 1337 | á |
)Notes: (1) CGF 1-4 (2) CGF 5-4, both in Hilker et al. (1999)
Our 2dF measurements of unresolved objects are 80% complete in the magnitude range of these objects (
). There is therefore about one more similar compact object still to be found in in our central 2dF field. The number density of these objects is therefore 
per 2dF field ( square degrees). Two of the objects (the two brightest) were also identified as cluster members by Hilker et al. (1999). Hilker et al. measured spectra of about 50 galaxies brighter than V=20 in a square region of width 0.25 degrees at the centre of the Fornax Cluster. In the ``galaxies'' they include objects which were very compact, but still resolved. By contrast our own survey covers a much larger area and also includes all unresolved objects.
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á© Copyright Astronomical Society of Australia 1997