Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-18
Astron.J.135:374-379,2008
Astronomy and Astrophysics
Astrophysics
7 pages, 3 figures. Accepted for publication in AJ
Scientific paper
10.1088/0004-6256/135/1/374
The Hamburg/ESO quasar HE 1113-0641 is found to be a quadruple gravitational lens, based on observations with the twin 6.5m Magellan telescopes at the Las Campanas Observatory, and subsequently with the Hubble Space Telescope. The z_S=1.235 quasar appears in a cross configuration, with i' band magnitudes ranging from 18.0 to 18.8. With a maximum image separation of 0.67'', this is the smallest-separation quadruple ever identified using a ground-based optical telescope. PSF subtraction reveals a faint lensing galaxy. A simple lens model succeeds in predicting the observed positions of the components, but fails to match their observed flux ratios by up to a magnitude. We estimate the redshift of the lensing galaxy to be z_L~0.7. Time delay estimates are on the order of a day, suggesting that the flux ratio anomalies are not due to variability of the quasar, but may result from substructure or microlensing in the lens galaxy.
Blackburne Jeffrey A.
Schechter Paul L.
Wisotzki Lutz
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