A weak lensing study of the Coma cluster

R. Gavazzi*, C. Adami, F. Durret, J. C. Cuillandre, O. Ilbert, A. Mazure, R. Pelló, M. P. Ulmer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)L33-L36
JournalAstronomy and Astrophysics
Issue number2
StatePublished - May 2009


  • Galaxies: clusters: individual: Coma
  • Gravitational lensing

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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