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 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 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- 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