Volume 395, Number 1, November III 2002
|Page(s)||17 - 23|
|Section||Cosmology (including clusters of galaxies)|
|Published online||29 October 2002|
HE 0435-1223: A wide separation quadruple QSO and gravitational lens*
Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
2 Dept. of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
3 Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, USA
4 Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
Corresponding author: L. Wisotzki, email@example.com
Accepted: 19 August 2002
We report the discovery of a new gravitationally lensed QSO, at a redshift , with four QSO components in a cross-shaped arrangement around a bright galaxy. The maximum separation between images is , enabling a reliable decomposition of the system. Three of the QSO components have , while component A is about 0.6 mag brighter. The four components have nearly identical colours, suggesting little if any dust extinction in the foreground galaxy. The lensing galaxy is prominent in the i band, weaker in r and not detected in g. Its spatial profile is that of an elliptical galaxy with a scale length of ~12 kpc. Combining the measured colours and a mass model for the lens, we estimate a most likely redshift range of . Predicted time delays between the components are 10 days. The QSO shows evidence for variability, with total g band magnitudes of 17.89 and 17.71 for two epochs separated by ~2 months. However, the relative fluxes of the components did not change, indicating that the variations are intrinsic to the QSO rather than induced by microlensing.
Key words: quasars: individual: HE 0435-1223 / quasars: general / gravitational lensing
© ESO, 2002
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