J/A+A/462/875 Garching-Bonn Deep Survey (GaBoDS) IX (Schirmer+, 2007)
GaBoDS: the Garching-Bonn Deep Survey.
IX. A sample of 158 shear-selected mass concentration candidates.
Schirmer M., Erben T., Hetterscheidt M., Schneider P.
<Astron. Astrophys., 462, 875-887 (2007)>
=2007A&A...462..875S 2007A&A...462..875S
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: cosmology: dark matter - galaxies: clusters: general -
gravitational lensing
Abstract:
The aim of the present work is the construction of a mass-selected
galaxy cluster sample based on weak gravitational lensing methods.
This sample will be subject to spectroscopic follow-up observations.
We apply the mass aperture statistics (S-statistics) and a new
derivative of it (the P-statistics) to 19 square degrees of high
quality, single colour wide field imaging data obtained with the
WFI@MPG/ESO 2.2m telescope. For the statistics a family of filter
functions is used that approximates the expected tangential radial
shear profile and thus allows for the efficient detection of mass
concentrations. The exact performance of the P-statistics still needs
to be evaluated by means of simulations.
Description:
The GaBoDS was conducted with the wide field imager (hereafter
WFI@2.2) of the 2.2m MPG/ESO telescope in the R-band. It is to about
80% a virtual survey, which means most of the data was not taken by us
but collected from the ESO archive.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 54 58 The 58 fields used for this work
tableb2.dat 69 158 Shear-selected mass concentrations
(tables B2-B4 of the paper)
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See also:
J/A+A/441/905 : UBVRI from the Garching-Bonn Deep Survey (Hildebrandt+, 2005)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Field Field name
14- 20 F7.3 deg RAdeg Right ascension, in decimal degrees (J2000)
22- 28 F7.3 deg DEdeg Declination, in decimal degrees (J2000)
30- 34 I5 s Texp Exposure time
36- 54 A19 --- Source Source of observation
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Byte-by-byte Description of file: tableb2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [SEH2007] Peak sequential number
5- 6 A2 --- Stat [SP ] Detection was made with either the S- or
the P-statistics (or both)
8- 11 F4.2 --- vS ? Significance of S-statistic detection
13- 17 F5.2 --- vP ? Significance of P-statistic detection
19 I1 --- Class Classification if along the line of sight an
overdensity of galaxies is found (1)
21- 22 I2 --- Rich ? Richness (2)
24- 26 I3 arcsec Dist ? Distance between peak and optical counterpart
28- 31 F4.1 arcmin scale ? Filter scale (3)
33- 37 F5.3 ---- xc ? Scale parameter (4)
39- 49 A11 --- Field Name of the survey field in which the detection
was made
52- 56 F5.3 --- z ? Redshift for the counterpart
57 A1 --- n_z [*] *: redshift based on the measurement of
less than three galaxies
59- 63 F5.3 --- z2 ? Second value of redshift for the counterpart
65- 69 F5.3 --- z3 ? Third value of redshift for the counterpart
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Note (1): Class 1 meaning a very obvious overdensity, and class 6 no
overdensity.
Note (2): Indicates how many galaxies were found as compared to the average
density in this field.
Note (3): The S-statistics is evaluated for 19 filter scales, i.e. 1.6,
2.0, 2.4, 2.8, 3.2, 3.6, 4.0, 4.8, 5.6, 6.3, 7.1, 7.9, 8.7, 9.9, 11.9,
13.9, 15.9, 17.9, 19.8 arcminutes. The odd numbers arise from the
original definition which was made in units of pixels.
Note (4): The S-statistics is evaluated for 7 different scale parameters,
i.e. 0.025, 0.05, 0.1, 0.2, 0.5, 1.0, 2.0.
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History:
From electronic version of the journal
References:
Schirmer et al., Paper I 2003A&A...407..869S 2003A&A...407..869S
Schirmer et al., Paper II 2004A&A...420...75S 2004A&A...420...75S
Hildebrandt et al. Paper III 2005A&A...441..905H 2005A&A...441..905H, Cat. J/A+A/441/905
Erben et al., Paper IV 2005AN....326..432E 2005AN....326..432E
Hildebrandt et al., Paper V 2006A&A...452.1121H 2006A&A...452.1121H
Simon et al., Paper VI 2007A&A...461..861S 2007A&A...461..861S
Hetterscheidt et al., Paper VII 2007A&A...468..859H 2007A&A...468..859H
Schirmer et al., Paper IX 2007A&A...462..875S 2007A&A...462..875S
(End) Patricia Vannier [CDS] 17-Sep-2007