J/MNRAS/413/1145 Galaxy clusters in the COSMOS field (Bellagamba+, 2011)
Optimal filtering of optical and weak lensing data to search for galaxy
clusters: application to the COSMOS field.
Bellagamba F., Maturi M., Hamana T., Meneghetti M., Miyazaki S.,
Moscardini L.
<Mon. Not. R. Astron. Soc., 413, 1145-1157 (2011)>
=2011MNRAS.413.1145B 2011MNRAS.413.1145B
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: gravitational lensing: weak - galaxies: clusters: general -
galaxies: luminosity function, mass function -
cosmology: observations - cosmology: theory -
large-scale structure of Universe
Abstract:
Galaxy clusters are usually detected in blind optical surveys via
suitable filtering methods. We present an optimal matched filter which
maximizes their signal-to-noise ratio by taking advantage of the
knowledge we have of their intrinsic physical properties and of the
data noise properties. In this paper we restrict our application to
galaxy magnitudes, positions and photometric redshifts if available,
and we also apply the filter separately to weak lensing data. The
method is suitable to be naturally extended to a multi-band approach
which could include not only additional optical bands but also
observables with different nature such as X-rays. For each detection,
the filter provides its significance, an estimate for the richness and
for the redshift even if photo-z are not given. The provided
analytical error estimate is tested against numerical simulations. We
finally apply our method to the COSMOS field and compare the results
with previous cluster detections obtained with different methods. Our
catalogue contains 27 galaxy clusters with minimal threshold at
3σ level including both optical and weak-lensing information.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 27 *Catalogue of the clusters detected with both
optical and lensing filters (No. 1-28)
tablea1.dat 39 120 Catalogue of the clusters detected with the optical
filter without lensing counterpart (No. 29-149)
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Note on table1.dat: The angular position is the one of the detection from
optical data.
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See also:
J/ApJS/172/182 : XMM Clusters of galaxies in COSMOS field (Finoguenov+ 2007)
J/A+A/461/81 : Galaxy clusters in the CFHTLS (Olsen+, 2007)
J/ApJ/669/714 : Subaru weak-lensing survey. I. (Miyazaki+, 2007)
Byte-by-byte Description of file: table1.dat tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number, <[BMH2011] NNN> in Simbad
5- 8 F4.2 --- z Cluster redshift
10- 16 F7.3 deg RAdeg Right ascension in decimal degrees (J2000)
18- 22 F5.3 deg DEdeg Declination in decimal degrees (J2000)
24- 28 F5.3 --- S/N Signal-to-noise ratio
30- 35 F6.2 --- Rich Cluster richness
37- 39 A3 --- Ref [XSOL ] Previous detections (1)
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Note (1): Flag indicates whether the cluster has been found previously with
other techniques as follows:
X = Finoguenov et al. (2007, Cat. J/ApJS/172/182)
S = Scoville et al. (2007ApJS..172..150S 2007ApJS..172..150S)
O = Olsen et al. (2007, Cat. J/A+A/461/81)
L = Kasliwal et al. (2008ApJ...684...34K 2008ApJ...684...34K) or
Miyazaki et al. (2007, Cat. J/ApJ/669/714)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Nov-2011