J/A+A/494/845 Galaxy clusters in the CFHTLS (Grove+, 2009)
Galaxy clusters in the CFHTLS. Matched-filter results in different passbands.
Grove L.F., Benoist C., Martel F.
<Astron. Astrophys. 494, 845 (2009)>
=2009A&A...494..845G 2009A&A...494..845G
ADC_Keywords: Surveys ; Clusters, galaxy ; Redshifts
Keywords: methods: data analysis - surveys - galaxies: clusters: general -
cosmology: large-scale structure of Universe
Abstract:
We investigate the gain of added leverage and completeness of the
constructed cluster catalogue, of applying the matched-filter
detection algorithm to multiple passbands. In particular, we
investigate the gain from having both i'- and z'-band data available
when searching for galaxy clusters at z≳1.
We applied a matched filter detection method to the CFHTLS r'- and
z'-band data of the four Deep fields and compared the cluster
catalogues with the one extracted from the i'-band data presented in a
previous paper. We also applied the matched filter to the Deep fields
but with the limiting magnitudes appropriate for the much larger Wide
survey in order to understand the best combination of i'- and z'-band
depth for the most efficient cluster searches based on this algorithm.
Description:
Galaxy cluster candidates for the four Deep fields of the CFHTLS.
For each cluster we give a name, position in J2000, estimated redshift
and richness, detection significance, number of redshift bins in which
the candidate showed a signal, fraction of masked area around the
candidate and a visual grade from A (best) to D (worst) and the name
of the matching i'-band detection if one exists.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 98 114 Cluster candidate parameters for detections
in r'-band
table5.dat 98 247 Cluster candidate parameters for detections
in z'-band
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See also:
J/ApJ/633/630 : Low-mass stars found in CFHTLS (Willott+, 2005)
J/A+A/461/81 : Galaxy clusters in the CFHTLS (Olsen+, 2007)
Byte-by-byte Description of file: table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- --- [CFHTLS-CL-]
11- 24 A14 --- CFHTLS-CL Name of the cluster candidate, JHHMMSS-DDMMSS
(CFHTLS-CL-JHHMMSS-DDMMSS)
26- 27 I2 h RAh Right ascension (J2000.0)
29- 30 I2 min RAm Right ascension (J2000.0)
32- 35 F4.1 s RAs Right ascension (J2000.0)
37 A1 --- DE- Declination sign (J2000.0)
38- 39 I2 deg DEd Declination (J2000.0)
41- 42 I2 arcmin DEm Declination (J2000.0)
44- 47 F4.1 arcsec DEs Declination (J2000.0)
49- 51 F3.1 --- z Redshift
53- 57 F5.1 --- lambda Richness, equivalent number of L* galaxies
59- 63 F5.2 --- S/N Detection significance
65- 66 I2 --- Nb Number of redshift bins
68- 71 F4.2 % lost Fraction of lost area
73 A1 --- Grade [ABCD] Visual grade (A:best to D:worst)
75- 84 A10 --- --- [CFHTLS-CL-]
85- 98 A14 --- Match Name of the matching i'-band cluster candidate
if one exists (Cat. J/A+A/461/81)
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Acknowledgements:
L.F. Grove, lisbeth(at)dark-cosmology.dk
(End) Lisbeth Fogh Grove [DARK, Denmark], Patricia Vannier [CDS] 05-Jan-2009