Deep radio observation of the gravitational lens candidate QSO2345+007

Details Deep radio observation of the gravitational lens candidate QSO2345+007 Deep radio observation of the gravitational lens candidate QSO2345+007

1996-01-18

arxiv.org/abs/astro-ph/9601093v1

Astronomy and Astrophysics

Astrophysics

5 pages, plain TeX, 1 Postscript figure included, submitted to Monthly Notices of the Royal Astronomical Society

Scientific paper

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\ts $\mu$Jy per beam. We have a $4\sigma$ 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 $\lesssim 10$\ts $\mu$Jy. The non-detection of the B component is thus consistent with, but does not prove, the lens interpretation.

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