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Title: HE 1113-0641: THE SMALLEST-SEPARATION QUADRUPLE LENS IDENTIFIED BY A GROUND-BASED OPTICAL TELESCOPE

Abstract

The Hamburg/ESO quasar HE 1113-0641 is found to be a quadruple gravitational lens, based on observations with the twin 6.5 m Magellan telescopes at the Las Campanas Observatory, and subsequently with the Hubble Space Telescope. The z{sub 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. Point-spread function (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{sub L} {approx} 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.

Authors:
;  [1];  [2]
  1. Department of Physics, Massachusetts Institute of Technology and Kavli Institute for Astrophysics and Space Research, 70 Vassar St., Cambridge, MA 02139 (United States)
  2. Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam (Germany)
Publication Date:
OSTI Identifier:
21583031
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (New York, N.Y. Online)
Additional Journal Information:
Journal Volume: 135; Journal Issue: 1; Other Information: DOI: 10.1088/0004-6256/135/1/374; Journal ID: ISSN 1538-3881
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GALAXIES; GRAVITATIONAL LENSES; IMAGES; QUASARS; RED SHIFT; TELESCOPES; TIME DELAY; COSMIC RADIO SOURCES; LENSES

Citation Formats

Blackburne, Jeffrey A, Schechter, Paul L, and Wisotzki, Lutz. HE 1113-0641: THE SMALLEST-SEPARATION QUADRUPLE LENS IDENTIFIED BY A GROUND-BASED OPTICAL TELESCOPE. United States: N. p., 2008. Web. doi:10.1088/0004-6256/135/1/374.
Blackburne, Jeffrey A, Schechter, Paul L, & Wisotzki, Lutz. HE 1113-0641: THE SMALLEST-SEPARATION QUADRUPLE LENS IDENTIFIED BY A GROUND-BASED OPTICAL TELESCOPE. United States. doi:10.1088/0004-6256/135/1/374.
Blackburne, Jeffrey A, Schechter, Paul L, and Wisotzki, Lutz. Tue . "HE 1113-0641: THE SMALLEST-SEPARATION QUADRUPLE LENS IDENTIFIED BY A GROUND-BASED OPTICAL TELESCOPE". United States. doi:10.1088/0004-6256/135/1/374.
@article{osti_21583031,
title = {HE 1113-0641: THE SMALLEST-SEPARATION QUADRUPLE LENS IDENTIFIED BY A GROUND-BASED OPTICAL TELESCOPE},
author = {Blackburne, Jeffrey A and Schechter, Paul L and Wisotzki, Lutz},
abstractNote = {The Hamburg/ESO quasar HE 1113-0641 is found to be a quadruple gravitational lens, based on observations with the twin 6.5 m Magellan telescopes at the Las Campanas Observatory, and subsequently with the Hubble Space Telescope. The z{sub 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. Point-spread function (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{sub L} {approx} 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.},
doi = {10.1088/0004-6256/135/1/374},
journal = {Astronomical Journal (New York, N.Y. Online)},
issn = {1538-3881},
number = 1,
volume = 135,
place = {United States},
year = {2008},
month = {1}
}