J/MNRAS/444/147 Richness of galaxy clusters (Oguri, 2014)
A cluster finding algorithm based on the multiband identification of red
sequence galaxies.
Oguri M.
<Mon. Not. R. Astron. Soc., 444, 147-161 (2014)>
=2014MNRAS.444..147O 2014MNRAS.444..147O
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: galaxies: clusters: general
Abstract:
We present a new algorithm, CAMIRA, to identify clusters of galaxies
in wide-field imaging survey data. We base our algorithm on the
stellar population synthesis model to predict colours of red sequence
galaxies at a given redshift for an arbitrary set of bandpass filters,
with additional calibration using a sample of spectroscopic galaxies
to improve the accuracy of the model prediction. We run the algorithm
on ∼11960deg2 of imaging data from the Sloan Digital Sky Survey
(SDSS) Data Release 8 to construct a catalogue of 71743 clusters in
the redshift range 0.1<z<0.6 with richness after correcting
for the incompleteness of the richness estimate greater than 20. We
cross-match the cluster catalogue with external cluster catalogues to
find that our photometric cluster redshift estimates are accurate with
low bias and scatter, and that the corrected richness correlates well
with X-ray luminosities and temperatures. We use the publicly
available Canada-France-Hawaii Telescope Lensing Survey shear
catalogue to calibrate the mass-richness relation from stacked weak
lensing analysis. Stacked weak lensing signals are detected
significantly for eight subsamples of the SDSS clusters divided by
redshift and richness bins, which are then compared with model
predictions including miscentring effects to constrain mean halo
masses of individual bins. We find the richness correlates well with
the halo mass, such that the corrected richness limit of 20
corresponds to the cluster virial mass limit of about
1x1014h-1M☉ for the SDSS DR8 cluster sample.
Description:
We apply our cluster finding algorithm CAMIRA to imaging data of SDSS
DR8 (Aihara et al., 2011ApJS..193...29A 2011ApJS..193...29A). The input galaxy catalogue
includes model magnitudes (MODEL_MAG) and their errors for SDSS
ugriz-band. We exclude galaxies with any of the following flags;
SATURATED, SATUR_CENTER, BRIGHT, and DEBLENDEDASMOVING. We only use
galaxies with extinction-corrected i-band magnitude brighter than 21.0
and its error smaller than 0.2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 44 71743 The CAMIRA SDSS DR8 cluster catalogue
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See also:
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Cluster right ascension (BCG position) (J2000)
12- 21 F10.6 deg DEdeg Cluster declination (BCG position) (J2000)
23- 28 F6.4 --- z [0.1/0.6] Cluster redshift
30- 36 F7.3 --- Ncor [20/158] Corrected richness
38- 44 F7.3 --- Nmem [4.4/123] Uncorrected richness
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Apr-2015