Further Spectroscopic Observations of the CSL 1 Object
Abstract
CSL 1 is a peculiar object (R.A.=12h23m30.5 s, decl.=-12deg38'57.0" [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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 2006
- DOI:
- 10.1086/499429
- arXiv:
- arXiv:astro-ph/0506400
- Bibcode:
- 2006ApJ...636L...5S
- Keywords:
-
- Cosmology: Cosmological Parameters;
- galaxies: individual (CSL 1);
- Galaxies: Peculiar;
- Cosmology: Gravitational Lensing;
- Astrophysics
- E-Print:
- In press on ApJ Letters. 10 pages, 3 figures - Accepted version with additional statistical evidence