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Issue A&A
Volume 419, Number 3, June I 2004
Page(s) L31 - L34
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20040131



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. Reimers5

1  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 $1\farcs44$ 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  $K_{\rm s}$ bands (2.1  $\mu$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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© ESO 2004


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