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Moderate galaxy–galaxy lensing

Authors

  • Shude Mao,

    Corresponding author
    1. National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, China
    2. Jodrell Bank Centre for Astrophysics, the University of Manchester, Manchester M13 9PL
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  • Jian Wang,

    Corresponding author
    1. Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, Beijing 100084, China
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  • Martin C. Smith

    1. National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, China
    2. The Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Lu 5, Beijing 100871, China
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E-mail: shude.mao@gmail.com (SM); jian-w06@mails.tsinghua.edu.cn (JW)

ABSTRACT

We study moderate gravitational lensing where a background galaxy is magnified substantially, but not multiply imaged, by an intervening galaxy. We focus on the case where both the lens and source are elliptical galaxies. The signatures of moderate lensing include isophotal distortions and systematic shifts in the Fundamental Plane and Kormendy relation, which can potentially be used to statistically determine the galaxy mass profiles. These effects are illustrated using Monte Carlo simulations of galaxy pairs where the foreground galaxy is modelled as a singular isothermal sphere model and observational parameters appropriate for the Large Synoptic Survey Telescope. The range in radius probed by moderate lensing will be larger than that by strong lensing, and is in the interesting regime where the density slope may be changing.

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