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 / M., Sazhin; Capaccioli, Massimo; Longo, Giuseppe; Paolillo, Maurizio; O., Khovanskaya. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - STAMPA. - 636:(2006), pp. L5-L8. [10.1086/499429]
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
