J/A+A/461/81 Galaxy clusters in the CFHTLS (Olsen+, 2007)
Galaxy clusters in the CFHTLS.
First matched filter candidate catalogue of the Deep fields.
Olsen L.F., Benoist C., Cappi A., Maurogordato S., Mazure A., Slezak E.,
Adami C., Ferrari C., Martel F.
<Astron. Astrophys. 461, 81 (2007)>
=2007A&A...461...81O 2007A&A...461...81O
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: methods: data analysis - surveys - galaxies: Clusers: general -
cosmology: large-scale structure of Universe
Abstract:
We apply a matched-filter cluster detection algorithm to the
Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) i-band data
for the Deep-1, Deep-2, Deep-3 and Deep-4 fields covering a total
of 4 square degrees. To test the implemented procedure we carry out
simulations for assessing the frequency of noise peaks as well as
estimate the recovery efficiency. We estimate that up to z∼0.7 the
catalogue is essentially complete for clusters of richness class R≳1.
The recovered redshifts are in general overestimated by dz=0.1 with a
scatter of sigmadz∼0.1, except at redshifts z≳1 where the estimated
redshifts are systematically underestimated. The constructed cluster
candidate catalogue contains 162 detections over an effective area of
3.112 square degrees corresponding to a density of ∼52.1 per square
degree. The median estimated redshift of the candidates is z=0.6. The
estimated noise frequency is 16.9±5.4 detections per square degree.
From visual inspection we identify systems that show a clear
concentration of galaxies with similar colour. These systems have a
density of ∼20 per square degree.
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).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 73 169 Cluster candidate parameters
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See also:
II/317 : The CFHTLS Survey (T0007) (Hudelot+ 2012)
J/ApJ/633/630 : Low-mass stars in CFHTLS (Willott+, 2005)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- --- [CFHTLS-CL-]
11- 24 A14 --- CFHTLS-CL Cluster designation (JHHMMSS-DDMMSS)
26- 27 I2 h RAh Right ascension (J2000.0)
28 A1 --- --- [:]
29- 30 I2 min RAm Right ascension (J2000.0)
31 A1 --- --- [:]
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)
40 A1 --- --- [:]
41- 42 I2 arcmin DEm Declination (J2000.0)
43 A1 --- --- [:]
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 --- Nbins Number of redshift bins
68- 71 F4.2 % lostArea Fraction of lost area
73 A1 --- grade [ABCD] Visual grade (A:best to D:worst)
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Histocial notes:
* 14-Dec-2006: Original version
* 15-Nov-2007: 7 objects added at the end of the table (from author)
Acknowledgements:
L.F. Olsen, lisbeth(at)dark-cosmology.dk
(End) Lisbeth Fogh Olsen [DARK, Denmark], Patricia Vannier [CDS] 02-Oct-2006