Abstract
The recently reported double quasar Q2345+007A, B, with a large separation of about 7.3 arcsec between its components, is demonstrated to impose stringent constraints on possible gravitational lens models. A single gravitational lens can produce the large separation only if it is placed close to the observer at a redshift Z ≲ 0.14. A model involving two intervening galaxies at different redshifts (the double lens) is studied and shown to account for the observed features with reasonable values for the lens parameters. The effects of a cluster are also considered in some detail. Observational tests for distinguishing between various scenarios are suggested; in particular, the time delay between the two images turns out to have opposite signs for the single lens and double lens models.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
