2MASS Galaxies in the Fornax Cluster Spectroscopic Survey
R.A.H. Morris (1), S. Phillipps (1), J.B. Jones (2), M.J. Drinkwater, (3), M.D. Gregg (4,5), W.J. Couch (6), Q.A. Parker (7,8), R.M. Smith (9), ((1) Bristol Astrophysics Group, (2) Astronomy Unit, Queen Mary University of, London, (3) Department of Physics

TL;DR
This study investigates the overlap between 2MASS infrared galaxy data and the Fornax Cluster Spectroscopic Survey, revealing the extent of cluster galaxy detection and the characteristics of galaxies missed by 2MASS.
Contribution
It provides a detailed comparison of 2MASS and FCSS galaxy samples, highlighting the limitations of 2MASS in detecting certain cluster and non-cluster galaxies.
Findings
All 114 XSC objects in the overlap are confirmed galaxies.
23 Fornax Cluster galaxies are identified in the matched data.
Most unresolved 2MASS galaxies are non-cluster galaxies at higher redshifts.
Abstract
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 < b_j < 19.7 irrespective of their morphology (i.e. including `stars', `galaxies' and `merged' images). 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. 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…
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