HE 1113-0641: The Smallest Separation Gravitational Lens Identified by a Ground-based Optical Telescope

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dc.creatorBlackburne, Jeffrey A.
dc.creatorWisotzki, Lutz
dc.creatorSchechter, Paul L.
dc.date2007-10-18
dc.date.accessioned2026-07-07T11:12:23Z
dc.date.available2026-07-07T11:12:23Z
dc.descriptionThe 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.
dc.description7 pages, 3 figures. Accepted for publication in AJ
dc.identifierhttps://arxiv.org/abs/0710.3593
dc.identifierhttp://arxiv.org/abs/0710.3593
dc.identifierAstron.J.135:374-379,2008
dc.identifierdoi:10.1088/0004-6256/135/1/374
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191366
dc.subjectAstrophysics
dc.titleHE 1113-0641: The Smallest Separation Gravitational Lens Identified by a Ground-based Optical Telescope
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