TY - JOUR
T1 - A weak lensing study of the Coma cluster
AU - Gavazzi, R.
AU - Adami, C.
AU - Durret, F.
AU - Cuillandre, J. C.
AU - Ilbert, O.
AU - Mazure, A.
AU - Pelló, R.
AU - Ulmer, M. P.
PY - 2009/5
Y1 - 2009/5
N2 - Context. Due to observational constraints, dark matter determinations in nearby clusters based on weak lensing are still extremely rare, in spite of their importance for the determination of cluster properties independent of other methods.Aims. We present a weak lensing study of the Coma cluster (redshift∼0.024) based on deep images obtained at the CFHT.Methods. After obtaining photometric redshifts for the galaxies in our field based on deep images in the μ* (1 X 1 deg2), and in the B,V,R and I bands (42'Z 52'), allowing us to eliminate foreground galaxies, we apply weak lensing calculations on shape measurements performed in the μ* image.Results. We derive a map of the mass distribution in Coma, as well as the radial shear profile, and the mass and concentration parameter at various radii. We obtain M200c = 5.1+4.3 -2.2X 014h-1 70M⊙ and .0+3.2 -2.5, in good agreement with previous easurements.Conclusions. With deep wide field images it is now possible to analyze nearby clusters with weak lensing techniques, thus opening a broad new field of investigation.
AB - Context. Due to observational constraints, dark matter determinations in nearby clusters based on weak lensing are still extremely rare, in spite of their importance for the determination of cluster properties independent of other methods.Aims. We present a weak lensing study of the Coma cluster (redshift∼0.024) based on deep images obtained at the CFHT.Methods. After obtaining photometric redshifts for the galaxies in our field based on deep images in the μ* (1 X 1 deg2), and in the B,V,R and I bands (42'Z 52'), allowing us to eliminate foreground galaxies, we apply weak lensing calculations on shape measurements performed in the μ* image.Results. We derive a map of the mass distribution in Coma, as well as the radial shear profile, and the mass and concentration parameter at various radii. We obtain M200c = 5.1+4.3 -2.2X 014h-1 70M⊙ and .0+3.2 -2.5, in good agreement with previous easurements.Conclusions. With deep wide field images it is now possible to analyze nearby clusters with weak lensing techniques, thus opening a broad new field of investigation.
KW - Galaxies: clusters: individual: Coma
KW - Gravitational lensing
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U2 - 10.1051/0004-6361/200911841
DO - 10.1051/0004-6361/200911841
M3 - Article
AN - SCOPUS:66249108921
SN - 0004-6361
VL - 498
SP - L33-L36
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 2
ER -