2MASS galaxies in the Fornax cluster spectroscopic survey* (Research Note)

Morris, R. A. H., Phillipps, S., Jones, J. B., Drinkwater, M. J., Gregg, M. D., Couch, W. J., Parker, Q. A. and Smith, R. M. (2007) 2MASS galaxies in the Fornax cluster spectroscopic survey* (Research Note). Astronomy & Astrophysics: a European Journal, 476 1: 59-62. doi:10.1051/0004-6361:20053734

Author Morris, R. A. H.
Phillipps, S.
Jones, J. B.
Drinkwater, M. J.
Gregg, M. D.
Couch, W. J.
Parker, Q. A.
Smith, R. M.
Title 2MASS galaxies in the Fornax cluster spectroscopic survey* (Research Note)
Journal name Astronomy & Astrophysics: a European Journal   Check publisher's open access policy
ISSN 0004-6361
Publication date 2007-12
Year available 2007
Sub-type Article (original research)
DOI 10.1051/0004-6361:20053734
Open Access Status DOI
Volume 476
Issue 1
Start page 59
End page 62
Total pages 4
Editor Bertout, C.
Place of publication Les Ulis, France
Publisher E D P Sciences
Collection year 2008
Language eng
Abstract Context.The Fornax cluster spectroscopic survey (FCSS) is an all-object survey of a region around the Fornax cluster of galaxies undertaken using the 2dF multi-object spectrograph on the Anglo-Australian telescope. Its aim was to obtain spectra for a complete sample of all objects with 16.5 < bj < 19.7 irrespective of their morphology (i.e. including "stars", "galaxies" and "merged" images). Aims.We explore the extent to which (nearby) cluster galaxies are present in 2MASS. We consider the reasons for the omission of 2MASS galaxies from the FCSS and vice versa. Methods.We consider the intersection (2.9 square degrees on the sky) of our data set with the infra-red 2 micron all-sky survey (2MASS), using both the 2MASS extended source catalogue (XSC) and the point source catalogue (PSC). We match all the XSC objects to FCSS counterparts by position and also extract a sample of galaxies, selected by their FCSS redshifts, from the PSC. Results.We confirm that all 114 XSC objects in the overlap sample are galaxies, on the basis of their FCSS velocities. A total of 23 Fornax cluster galaxies appear in the matched data, while, as expected, the remainder of the sample lie at redshifts out to z = 0.2 (the spectra show that 61% are early type galaxies, 18% are intermediate types and 21% are strongly star forming).The PSC sample turns out to contain twice as many galaxies as does the XSC. However, only one of these 225 galaxies is a (dwarf) cluster member. On the other hand, galaxies which are unresolved in the 2MASS data (though almost all are resolved in the optical) amount to 71% of the non-cluster galaxies with 2MASS detections and have redshifts out to z = 0.32.
Keyword Surveys
Q-Index Code C1

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Created: Mon, 07 Apr 2008, 14:54:39 EST by Jenny Robinson on behalf of School of Mathematics & Physics