SIMBAD references

2002A&A...395...17W - Astronomy and Astrophysics, volume 395, 17-23 (2002/11-3)

HE 0435-1223: A wide separation quadruple QSO and gravitational lens.


Abstract (from CDS):

We report the discovery of a new gravitationally lensed QSO, at a redshift z=1.689, with four QSO components in a cross-shaped arrangement around a bright galaxy. The maximum separation between images is 2.6", enabling a reliable decomposition of the system. Three of the QSO components have g≃19.6, 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 ∼12kpc. Combining the measured colours and a mass model for the lens, we estimate a most likely redshift range of 0.3<z<0.4. Predicted time delays between the components are ≲10days. 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.

Abstract Copyright:

Journal keyword(s): quasars: individual: HE 0435-1223 - quasars: general - gravitational lensing

Nomenclature: Fig.2, Table 1: [WSB2002] 0435-1223 A (Nos A-D, G).

Simbad objects: 10

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