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Deep radio observation of the gravitational lens candidate QSO2345+007 | | Alok R. Patnaik
; Peter Schneider
; Ramesh Narayan
; | | Date: |
18 Dec 1995 | | Subject: | astro-ph | | Affiliation: | Max-Planck-Institut f. Radioastronomie), Peter Schneider (Max-Planck-Institut f. Astrophysik), and Ramesh Narayan (Harvard-Smithonian Center for Astrophysics | | Abstract: | The double QSO2345+007 comprises two optical components separated by 7.1 arcseconds and is the most prominent `dark matter’ gravitational lens candidate. Despite being known for more than a decade, optical spectroscopy and imaging have been unable to determine whether this double QSO is a binary QSO or a gravitational lens system. In this note we report a deep VLA observation of this system, yielding a map with a noise level of 8.5 s $mu$Jy per beam. We have a $4sigma$ detection of a radio source within one arcsecond of the optical position of the brighter A-component of the QSO, but no significant detection of any radio counterpart of the B component. Given that the flux ratio in the optical waveband is $sim$3--4, the gravitational lens hypothesis for this system would predict a radio flux of image B of $lesssim 10$ s $mu$Jy. The non-detection of the B component is thus consistent with, but does not prove, the lens interpretation. | | Source: | arXiv, astro-ph/9601093 | | Services: | Forum | Review | PDF | Favorites | |
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