Access to Astronomical Catalogues

← Click to display the menu
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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
Acknowledgements: L.F. Grove, lisbeth(at)
(End) Lisbeth Fogh Grove [DARK, Denmark], Patricia Vannier [CDS] 05-Jan-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service