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A&A 419, L31-L34 (2004)
DOI: 10.1051/0004-6361:20040131
Letter
HE 0047-1756: A new gravitationally lensed double QSO
L. Wisotzki1, 2, P. L. Schechter3, H.-W. Chen3, D. Richstone4, K. Jahnke1, S. F. Sánchez1 and D. Reimers51 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
e-mail: lwisotzki@aip.de
2 Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
3 Center for Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
4 Dept. of Astronomy, University of Michigan, 830 Dennison, 501 East University Avenue, Ann Arbor, MI 48109, USA
5 Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
(Received 19 March 2004 / Accepted 4 April 2004 )
Abstract
The quasar HE 0047-1756, at
z=1.67, is found to be split
into two images
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 in the
i (800 nm) and
bands (2.1
m);
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 is evidence for a partial Einstein ring emanating from the
brighter image toward the fainter one.
Key words: quasars: individual: HE 0047-1756 -- quasars: general -- gravitational lensing
Offprint request: L. Wisotzki, lutz@aip.de
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