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The Possible Origins of the $VR$ Magnification Ratios of Q0957+561AB
2004
Proceedings of the International Astronomical Union
We present V R magnification ratios of the double quasar Q0957+561AB, which are inferred from frames taken with the 2.56m Nordic Optical Telescope. From two different photometric techniques (pho2comC and psf phot) and a reasonable range for the time delay in the system (415-430 days), we find optical continuum ratios depending on the wavelength. These chromatic ratios are consistent with either differential extinction in a dust system or gravitational microlensing in the deflector. Although the
doi:10.1017/s1743921305002103
fatcat:w7pnfmw4wzajxbw4dtcnkfiyvm