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Gravitational lens optics.

R D Blandford, C S Kochanek, I Kovner

    Science (New York, N.Y.)
    |August 25, 1989
    PubMed
    Summary
    This summary is machine-generated.

    Gravitational lenses, formed by galaxies and clusters, create multiple images of distant objects. These cosmic lenses offer insights into galaxy properties and cosmology, including measuring the Hubble constant.

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    Area of Science:

    • Cosmology
    • Astrophysics
    • Optics

    Background:

    • Recent discoveries reveal multiple imaging of distant cosmic sources by intervening galaxies and galaxy clusters.
    • These phenomena, known as gravitational lenses, exhibit unique optical characteristics.
    • Pointlike sources like quasars typically yield two or four images, while extended sources like galaxies form arcs and rings.

    Purpose of the Study:

    • To explain the optical properties of gravitational lenses.
    • To demonstrate their utility as probes for lensing galaxies and clusters.
    • To highlight their potential for cosmographic data, such as the Hubble constant.

    Main Methods:

    • Utilizing simple elliptical lens models to approximate mass distributions.
    • Analyzing observed optical properties of lensed quasars and galaxies.

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  • Comparing observations with predictions from lens models.

    • Main Results:

    • Elliptical lens models successfully reproduce salient features of observed gravitational lensing.
    • Distinct imaging patterns (multiple images, arcs, rings) are characteristic of different source types.
    • Gravitational lenses magnify distant sources.

    Conclusions:

    • Gravitational lensing illustrates optics on a cosmological scale.
    • These lenses serve as valuable tools for studying galaxies and galaxy clusters.
    • Gravitational lenses hold potential for determining cosmographic data, including the Hubble constant.