HE 0047-1756: A new gravitationally lensed double QSO

Details HE 0047-1756: A new gravitationally lensed double QSO HE 0047-1756: A new gravitationally lensed double QSO

2004-03-19

arxiv.org/abs/astro-ph/0403475v1

Astron.Astrophys. 419 (2004) L31-L34

Astronomy and Astrophysics

Astrophysics

4 pages, submitted to A&A Letters

Scientific paper

10.1051/0004-6361:20040131

The quasar HE 0047-1756, at z=1.67, is found to be split into two images 1.44" apart by an intervening galaxy acting as a gravitational lens. The flux ratio for the two components is roughly 3.5:1, depending slightly upon wavelength. The lensing galaxy is seen on images obtained at 800 nm and 2.1 \mu; there is also a nearby faint object which may be responsible for some shear. The spectra of the two quasar images are nearly identical, but the emission line ratio between the two components scale differently from the continuum. Moreover, the fainter component has a bluer continuum slope than the brighter one. We argue that these small differences are probably due to microlensing. There are hints of an Einstein ring emanating from the brighter image toward the fainter one.

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