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J/A+A/422/407       BVR photometry of MS0302+17              (Gavazzi+, 2004)

Mass and Light in the Supercluster of Galaxies MS0302+17. Gavazzi R., Mellier Y., Fort B., Cuillandre J.-C., Dantel-Fort M. <Astron. Astrophys. 422, 407 (2004)> =2004A&A...422..407G
ADC_Keywords: Clusters, galaxy ; Photometry, UBVRI Keywords: cosmology: large-scale structure of Universe - gravitational lensing - cosmology: dark matter Abstract: We investigate the supercluster MS0302+17 (ClG 0302+17, z∼0.42) using weak lensing analysis and deep wide field BVR photometry with the CFH12K camera. Using (B-V) vs (V-R) evolution tracks we identify early-type members of the supercluster, and foreground ellipticals. We derive a R band catalogue of background galaxies for weak lensing analysis. We compute the correlation functions of light and mass and their cross-correlation and test if light traces mass on supercluster, cluster and galaxy scales. We show that the data are consistent with this assertion. The ζ-statistic applied in regions close to cluster centers and global correlation analyses over the whole field converge toward the simple relation M/L=300±30M/L in the B band. This independently confirms the earlier results obtained by Kaiser (1998ApJ...498...26K). If we model dark matter halos around each early-type galaxy by a truncated isothermal sphere, we find that a linear relation M∝L still holds. In this case, the average halo truncation radius is s*≲200(h70)-1kpc close to clusters cores whereas it reaches a lower limit of ∼300(h70)-1kpc at the periphery. This change of s* as a function of radial distance may be interpreted as a result of tidal stripping of early type galaxies. Nevertheless the lack of information on the spatial distribution of late-type galaxies affects such conclusions concerning variations of s*. Though all the data at hand are clearly consistent with the assumption that mass is faithfully traced by light from early-type galaxies, we are not able to describe in detail the contribution of late type galaxies. We however found it to be small. Forthcoming wide surveys in UV, visible, and near infrared wavelengths will provide large enough samples to extend this analysis to late-type galaxies using photometric redshifts. Description: We report the sample of galaxies we used for the MS0302+17 photometric and weak lensing analysis, observed on October 12, 1999 with the CFH12K camera mounted at the prime focus of the Canada-France-Hawaii Telescope. In the same file, we report background lensed galaxies, supercluster and foreground early-types galaxies. Stars are also presented. When unknown, fields are assigned an arbitrary value of -99.00. The AB photometry is for CFH12k filters. The R image is much deeper. So we detected more objects with sometimes no B or V reliable counter-part. Coordinates are in J2000. We introduce a flag in order to identify the type. Lenses (either supercluster members (flag=2) or foreground(flag=3)) do not contribute to the lensing signal and we do not report ellipticity components whereas for background galaxies (flag=1), we report (e1,e2) components with the corresponding uncertainty. They are corrected from PSF smearing using standard KSB method. We also report stars (flag=4) that have been used for PSF smearing correction. In this case, we report (e1,e2) ellipticity components before and after psf-correction. Unused objects (that may contain spurious detections!!) are reported with flag=0. Use them with caution. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 118 96508 The catalogue
Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
2- 9 F8.4 deg RAdeg Right ascension (J2000.0) 12- 19 F8.4 deg DEdeg Declination (J2000.0) 22- 27 F6.2 mag Bmag ?=-99.00 B magnitude (CFH12k)_AB 30- 35 F6.2 mag e_Bmag ?=-99.00 Error on B magnitude 38- 43 F6.2 mag Vmag ?=-99.00 V magnitude (CFH12k)_AB 46- 51 F6.2 mag e_Vmag ?=-99.00 Error on V magnitude 54- 59 F6.2 mag Rmag ?=-99.00 R magnitude (CFH12k)_AB 62- 67 F6.2 mag e_Rmag ?=-99.00 Error on R magnitude 70 I1 --- f_e1 Flag (1) 73- 81 F9.4 --- e1 ?-99.0000 e1 ellipticity (2) 85- 93 F9.4 --- e1c ?-99.0000 Error on e1 (flag=1) or corrected e1 (flag=4) 97-105 F9.4 --- e2 ?-99.0000 e2 ellipticity (2) 109-117 F9.4 --- e2c ?-99.0000 Error on e2 (flag=1) or corrected e2 (flag=4)
Note (1): Flags: 0: unused, 1: background source, 2: supercluster lens, 3: foreground lens, 4: star. Note (2): e1 (resp. e2) is corresponds to the ellipticity component projected along right ascension (resp. declination) axis.
Acknowledgements: Raphael Gavazzi
(End) Raphael Gavazzi [IAP, France] 30-Apr-2004
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

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