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Title:
Gravitational lensing by cosmic strings: what we learn from the CSL-1 case
Authors:
Sazhin, M. V.; Khovanskaya, O. S.; Capaccioli, M.; Longo, G.; Paolillo, M.; Covone, G.; Grogin, N. A.; Schreier, E. J.
Affiliation:
AA(Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, Moscow, Russia), AB(Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, Moscow, Russia), AC(VSTceN-INAF - via Moiariello 16, 80131 Napoli, Italy; University of Napoli Federico II, Department of Physical Sciences, via Cinthia 6, 80126 Napoli, Italy), AD(University of Napoli Federico II, Department of Physical Sciences, via Cinthia 6, 80126 Napoli, Italy; INAF – Osservatorio Astronomico di Capodimonte, via Moiariello 16, Napoli, Italy; INFN – Napoli Unit, via Cinthia 6, 80126 Napoli, Italy), AE(University of Napoli Federico II, Department of Physical Sciences, via Cinthia 6, 80126 Napoli, Italy; INFN – Napoli Unit, via Cinthia 6, 80126 Napoli, Italy; Space Telescope Science Institute, Baltimore, MD, USA; Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, Moscow, Russia), AF(INAF - Osservatorio Astronomico di Capodimonte, via Moiariello 16, Napoli, Italy), AG(Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA), AH(Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA; Associated Universities Inc., Washington, DC 20036, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 376, Issue 4, pp. 1731-1739. (MNRAS Homepage)
Publication Date:
04/2007
Origin:
MNRAS
MNRAS Keywords:
gravitational lensing , galaxies: elliptical and lenticular, cD , galaxies: interactions , cosmology: miscellaneous
DOI:
10.1111/j.1365-2966.2007.11543.x
Bibliographic Code:
2007MNRAS.376.1731S

Abstract

Cosmic strings were postulated by Kibble in 1976 and, from a theoretical point of view, their existence finds support in modern superstring theories, both in compactification models and in theories with extended additional dimensions. Their eventual discovery would lead to significant advances in both cosmology and fundamental physics. One of the most effective ways to detect cosmic strings is through their lensing signatures which appear to be significantly different from those introduced by standard lenses (i.e. compact clumps of matter). In 2003, the discovery of the peculiar object CSL-1 raised the interest of the physics community since its morphology and spectral features strongly argued in favour of it being the first case of gravitational lensing by a cosmic string. In this paper we provide a detailed description of the expected observational effects of a cosmic string and show, by means of simulations, the lensing signatures produced on background galaxies. While high angular resolution images obtained with Hubble Space Telescope, revealed that CSL-1 is a pair of interacting ellipticals at redshift 0.46, it represents a useful lesson to plan future surveys.
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