Context: The center of the galaxy cluster RX J0054.0-2823 at z = 0.292 is a dynamically active region that includes an interacting system of three galaxies surrounded by a large halo of intra-cluster light.
Aims: We report here the discovery of an S-shaped feature of total length 11́́ in the central region of this cluster and discuss its physical nature.
Methods: We test the gravitational lensing assumption by doing a mass modeling of the central part of the galaxy cluster.
Results: We very naturally reproduce position and form of this S-shaped feature as a gravitationally lensed background object at redshift between 0.5 and 1.0.
Conclusions: .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 Ṽ24 mag arcsec-2.
Astronomy and Astrophysics
- Pub Date:
- March 2007
- cosmology: observations;
- galaxies: clusters: individual: RX J0054.0-2823;
- galaxies: interactions;
- gravitational lensing;
- 6 pages, accepted for publication in A&