CSL 1 is a peculiar object (R.A = 12(h)23(m)30(s).5, decl. = -12 degrees 38'57''.0 [J2000.0]) that, because of its photometric and spectroscopic properties, is possibly the first case of gravitational lensing by a cosmic string. In this Letter we present additional evidence, based on medium to high resolution VLT + FORS1 observations, that the spectra of the two components of CSL 1 are identical within a confidence level higher than 98% and that the velocity difference of the two components is consistent with zero. This result adds further confidence to the interpretation of the system as a true lens.

Further spectroscopic observations of the CSL-1 object

CAPACCIOLI, MASSIMO;LONGO, GIUSEPPE;PAOLILLO, MAURIZIO;
2006

Abstract

CSL 1 is a peculiar object (R.A = 12(h)23(m)30(s).5, decl. = -12 degrees 38'57''.0 [J2000.0]) that, because of its photometric and spectroscopic properties, is possibly the first case of gravitational lensing by a cosmic string. In this Letter we present additional evidence, based on medium to high resolution VLT + FORS1 observations, that the spectra of the two components of CSL 1 are identical within a confidence level higher than 98% and that the velocity difference of the two components is consistent with zero. This result adds further confidence to the interpretation of the system as a true lens.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/105714
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