Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-11-02
Astron.J.111:615,1996
Astronomy and Astrophysics
Astrophysics
50 pages of text in uuencoded/compressed format. Figures sent separately. Finding charts not included due to excessive size of
Scientific paper
10.1086/117811
We present an optical/near IR selected catalog of 79 clusters distributed over an area of 5.1~square~degrees. The catalog was constructed from images obtained with the 4-Shooter CCD mosaic camera on the Hale 5m telescope operating in ``scan" mode. The survey, hereafter known as the Palomar Distant Cluster Survey (PDCS), was conducted in two broad band filters that closely resemble~$V$ and~$I$. The $4\sigma$ limiting magnitudes for our 300 s exposures are~$\sim$~23.8~($V$) and~22.5~($I$). A matched filter algorithm was developed and employed to identify the cluster candidates by using positional and photometric data simultaneously. The clusters cover the range $0.2 \simless z \simless 1.2$, based on the redshift estimates derived in the cluster detection procedure. An accurate selection function is generated from extensive simulations. We find that the cumulative surface density of clusters with richness class R $\ge$ 1 is about a factor of 5 higher than the extrapolated density of R $\ge$ 1 Abell clusters. The PDCS results are consistent with a constant comoving density of clusters to $z \simless 0.6$, albeit at the above high density level. Constraints on cluster abundances at $z > 0.6$ will be possible with the acquisition of spectroscopic redshifts for a large subset of these cluster candidates. We also present a supplemental catalog of 28 clusters that do not satisfy all our selection criteria but which include some of the most distant systems detected in the survey. Finding charts for all 107 cluster candidates are provided.
Christensen Jennifer A.
Gunn James E.
Hoessel John G.
Lubin Lori Maxine
Oke Bev J.
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