- An S-shaped arc in the galaxy cluster RX J0054.0-2823 doi link

Author(s): Faure C., Giraud Edmond, Melnick J., Quintana H., Selman F., Wambsganss J.

(Article) Published: Astronomy & Astrophysics, vol. 463 p.833-837 (2007)
Links openAccess full text : arxiv

Ref HAL: in2p3-00135961_v1
Ref Arxiv: astro-ph/0610008
DOI: 10.1051/0004-6361:20065045
Ref. & Cit.: NASA ADS
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4 citations

The center of the galaxy cluster RX J0054.0-2823 at z = 0.292 is a dynamically active region which includes an interacting system of three galaxies surrounded by a large halo of intra-cluster light. We report here the discovery of an S-shaped feature of total length 11 arcsec in the central region of this cluster and discuss its physical nature. We test the gravitational lensing assumption by doing a mass modelling of the central part of the galaxy cluster. We very naturally reproduce position and form of this S-shape feature as a gravitationally lensed background object at redshift between 0.5 and 1.0. We conclude that the lensing nature is the very probable explanation for this S-shaped arc; the ultimate proof will be the spectroscopic confirmation by measuring the high redshift of this elongated feature with surface brightness V~24mag/arcsec2.

Comments: 6 pages, accepted for publication in A&A