Weak lensing mass reconstruction of the galaxy cluster Abell 209

Free access article

Issue		A&A Volume 467, Number 2, May IV 2007


Page(s)		427 - 436
Section		Cosmology (including clusters of galaxies)
DOI		http://dx.doi.org/10.1051/0004-6361:20066994

A&A 467, 427-436 (2007)
DOI: 10.1051/0004-6361:20066994

Weak lensing mass reconstruction of the galaxy cluster Abell 209

S. Paulin-Henriksson¹, V. Antonuccio-Delogu¹, C. P. Haines², M. Radovich², A. Mercurio², and U. Becciani¹

¹ INAF / Osservatorio Astrofisico di Catania via S. Sofia, 78, 95123 Catania, Italy
e-mail: paulin@in2p3.fr,[Vincenzo.Antonuccio;Ugo.Becciani]@oact.inaf.it
² INAF, Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131 Napoli, Italy

(Received 21 December 2006 / Accepted 5 February 2007)

Abstract
Context. Weak lensing applied to deep optical images of clusters of galaxies provides a powerful tool to reconstruct the distribution of the gravitating mass associated to these structures.
Aims. We use the shear signal extracted by an analysis of deep exposures of a region centered around the galaxy cluster ABCG $\,$ 209, at redshift $z\sim 0.2$ , to derive both a map of the projected mass distribution and an estimate of the total mass within a characteristic radius.
Methods. We use a series of deep archival R-band images from CFHT-12k, covering an area of ~ $0.3\,$ deg². We determine the shear of background galaxy images using a new implementation of the modified Kaiser-Squires-Broadhurst KSB+ pipeline for shear determination, which we has been tested against the "Shear TEsting Program 1 and 2'' simulations. We use mass aperture statistics to produce maps of the 2 dimensional density distribution, and parametric fits using both Navarro-Frenk-White and singular-isothermal-sphere profiles to constrain the total mass.
Results. The projected mass distribution shows a pronounced asymmetry, with an elongated structure extending from the SE to the NW. This is in general agreement with the optical distribution previously found by other authors. A similar elongation was previously detected in the X-ray emission map, and in the distribution of galaxy colours. The circular NFW mass profile fit gives a total mass of $M_{200} = 7.7^{+4.3}_{-2.7}\times 10^{14}\,{M}_\odot$ inside the virial radius $r_{200} = 1.8\pm 0.3\,$ Mpc.
Conclusions. The weak lensing profile reinforces the evidence for an elongated structure of ABCG $\,$ 209, as previously suggested by studies of the galaxy distribution and velocities.

Key words: gravitational lensing -- galaxies: clusters: individual: Abell 209

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