J/MNRAS/423/2436 CES ultra deep catalogue of galaxy structures (Sochting+, 2012)
Ultra deep catalogue of galaxy structures in the Cosmic Evolution Survey field.
Sochting I.K., Coldwell G.V., Clowes R.G., Campusano L.E., Graham M.J.
<Mon. Not. R. Astron. Soc., 423, 2436-2450 (2012)>
=2012MNRAS.423.2436S 2012MNRAS.423.2436S (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: methods: statistical - catalogues - galaxies: clusters: general
Abstract:
This paper presents a large sample of intermediate- to high-redshift
galaxy groups and clusters detected using a fully automated search in
the Cosmic Evolution Survey field. The detection algorithm is based on
density peak extraction from a density distribution sampled using
Voronoi tessellation within overlapping slices in the photometric
redshift space. The cluster catalogue contains 1780 structures
covering the redshift range 0.2<z<3.0, spanning three orders of
magnitude in luminosity (108<L4<5x1011L☉) and richness
from eight to hundreds of galaxies. All clusters at z>0.4 and many
even below this threshold show very prominent substructure indicating
that z∼0.4 marks the slow emergence of virialized clusters in this
field in agreement with published findings for other regions of the
sky. The redshift distribution of detected structures shows strong
variations with prominent peaks suggesting the presence of large-scale
structures across the whole range covered by this catalogue.
Supercluster candidates have been identified at redshifts z=0.35,
0.72, 0.94, 1.12, 1.27, 1.45, 2.0 and 2.52. At z=2.9 we identified a
compact agglomeration of galaxy groups and clusters suggesting the
presence of another supercluster-like structure which has been the
highest redshift candidate so far. Out of the nine supercluster
candidates found in this study, six are new detections.
Description:
We use the data of the 2 degree2 COSMOS (Scoville et al.,
2007ApJS..172...38S 2007ApJS..172...38S) with the 30-band photometric redshifts by Ilbert
et al. (2009ApJ...690.1236I 2009ApJ...690.1236I). The multiwavelength COSMOS catalogue
includes 607617 objects and it was designed for studies of galaxies
and large-scale structures at high redshift. The data reach a usable
depth of z=3 with sufficient objects at this redshift to allow a
statistically meaningful search for galaxy structures.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 73 1780 Complete cluster catalogue
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Cluster identification number
6- 15 F10.6 deg RAdeg Right Ascension (J2000)
17- 26 F10.6 deg DEdeg Declination (J2000)
28- 34 F7.5 --- z Photometric redshift of the cluster
36- 43 F8.6 --- e_z Standard deviation of the photometric
redshifts of member galaxies
45- 47 I3 --- R ? Richness (number of member galaxies)
49- 55 F7.4 Mpc+2 Area Area of the polygon enclosing all voronoi
tessells of member galaxies
57- 64 F8.4 --- n Number density (richness divided by area)
66- 73 E8.3 Lsun L4 Combined K luminosity of four brightest
member galaxies
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Feb-2016