Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-02-26
Mon.Not.Roy.Astron.Soc. 343 (2003) 353
Astronomy and Astrophysics
Astrophysics
Accepted for publication in the Mon. Not. Royal Astron. Society
Scientific paper
10.1046/j.1365-8711.2003.06568.x
CSL-1 (Capodimonte--Sternberg--Lens Candidate, No.1) is an extragalactic double source detected in the OAC-DF (Osservatorio Astronomico di Capodimonte - Deep Field). It can be interpreted either as the chance alignment of two identical galaxies at z=0.46 or as the first case of gravitational lensing by a cosmic string. Extensive modeling shows in fact that cosmic strings are the only type of lens which (at least at low angular resolution) can produce undistorted double images of a background source. We propose an experimentum crucis to disentangle between these two possible explanations. If the lensing by a cosmic string should be confirmed, it would provide the first measurements of energy scale of symmetry breaking and of the energy scale of Grand Unified Theory (GUT).
Alcala' Juan M.
Covone Giovanni
Khovanskaya O.
Longo Giuseppe
Pannella Maurilio
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