J/MNRAS/413/3059 4098 galaxy clusters in SDSS Stripe 82 (Geach+, 2011)
4098 galaxy clusters to z∼0.6 in the Sloan Digital Sky Survey equatorial
Stripe 82.
Geach J.E., Murphy D.N.A., Bower R.G.
<Mon. Not. R. Astron. Soc., 413, 3059-3067 (2011)>
=2011MNRAS.413.3059G 2011MNRAS.413.3059G
ADC_Keywords: Clusters, galaxy ; Redshifts ; QSOs
Keywords: catalogues - galaxies: clusters: general -
large-scale structure of Universe
Abstract:
We present a catalogue of 4098 photometrically selected galaxy
clusters with a median redshift =0.32 in the 270deg2 "Stripe 82"
region of the Sloan Digital Sky Survey (SDSS), covering the celestial
equator in the Southern Galactic Cap (-50°<RA<59°,
|DE|≤1.25). Owing to the multi-epoch SDSS coverage of this region,
the ugriz photometry is ∼2mag deeper than single scans within the
main SDSS footprint. We exploit this to detect clusters of galaxies
using an algorithm that searches for statistically significant
overdensities of galaxies in a Voronoi tessellation of the projected
sky.
Description:
We have chosen to distribute the full catalogue in Hierarchical Data
Format (HDF, version 5). This format provides a natural way for us to
release both the 'top level' cluster properties (coordinate,
redshift, etc.) and a wide range of other information, including
various richness classifications, and information for each of the
constituent galaxies. However, for simple access, we also provide a
"supplementary QSO sightline catalogue".
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
clusters.dat 186 4098 Stripe 82 cluster catalogue, top level
qsos.dat 88 18295 Supplementary QSO sightline catalogue
clusters.hdf5 512 529861 Full catalogue in Hierarchical Data Format
(HDF, version 5)
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Byte-by-byte Description of file: clusters.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Cluster Cluster sequential number
6- 23 E18.15 deg RAdeg Cluster right ascension (J2000)
25- 43 E19.15 deg DEdeg Declination (J2000)
45- 62 E18.15 deg RA1deg BCG right ascension (J2000) (1)
64- 82 E19.15 deg DE1deg BCG declination (J2000) (1)
84- 86 I3 --- Ngal Number of galaxies assigned to cluster
88-105 E18.15 --- z Cluster redshift
107-126 A20 --- n_z Code describing composite average of galaxy
redshifts (unexplained)
128-145 E18.15 rad r80 Angular radius containing 80% of the members
147-164 E18.15 --- C Concentration index (C=r80/r20)
166 I1 --- R [1/4]?=- Richness class
168-186 E19.15 --- Agc ?=- Richness estimator (amplitude of the
angular correlation function)
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Note (1): BCG = Brightest Cluster Galaxy
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Byte-by-byte Description of file: qsos.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- QSO QSO identification number
8- 17 F10.8 deg Sep Separation from cluster center, in degrees
19- 28 F10.8 Mpc R Separation from cluster center, in Mpc
30- 34 F5.3 --- zQSO QSO redshift
36- 43 F8.4 deg RAdeg QSO right ascension (J2000)
45- 52 F8.5 deg DEdeg QSO declination (J2000)
54- 57 F4.1 mag Vmag QSO V magnitude
59- 66 F8.6 --- zCl Cluster redshift
68- 79 F12.8 deg RAcdeg Cluster right ascension degrees (J2000)
81- 88 F8.5 deg DEcdeg Cluster declination (J2000)
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History:
Copied at http://www.physics.mcgill.ca/~jimgeach/stripe82
(End) Patricia Vannier [CDS] 15-Dec-2011