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Gravitational magnification effects on distant 3CR galaxies

  • II. Observations
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Gravitational Lensing

Part of the book series: Lecture Notes in Physics ((LNP,volume 360))

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Abstract

A photometric survey of 27 3CR galaxies with z>1 is presented. Unprecedented image quality of the data (mean FWHM=O"75 for the sample) have allowed us to find that ] of the galaxies are made of 2 to 6 components in a typical 50(Ho/50) kpc size.

We present direct as well as statistical evidences showing that the sample is subjected to significant gravitational magnification effects. In 4 cases where a foreground bright galaxy has been observed near the 3C object, the geometric configuration is well known and the basic parameters can be estimated; this allows gravitational magnification calculations to be made and show that these galaxies are magnified by 0.5 to 1.6 mag. Four galaxies over 27 are found at less than 4 arcsec from R<21 foreground galaxies, 9 times more than expected from a random distribution, and shows that the sample is affected in a statistical way by the foreground matter. We finally emphasize the importance of taking into account the gravitational magnification effects before estimating the amount of evolution in these systems.

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Author information

Authors and Affiliations

  1. Canada-France-Hawaii Telescope Corporation, P.O. Box 1597, H196743, Kamuela, USA

    O. Le Fevre

  2. D.A.E.C. Observatoire de Meudon, 92195, Meudon Principal Cedex, France

    F. Hammer

Authors
  1. O. Le Fevre
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  2. F. Hammer
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Editor information

Yannick Mellier Bernard Fort Geneviève Soucail

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© 1990 Springer-Verlag

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Le Fevre, O., Hammer, F. (1990). Gravitational magnification effects on distant 3CR galaxies. In: Mellier, Y., Fort, B., Soucail, G. (eds) Gravitational Lensing. Lecture Notes in Physics, vol 360. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0009239

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  • DOI: https://doi.org/10.1007/BFb0009239

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-52648-3

  • Online ISBN: 978-3-540-47087-8

  • eBook Packages: Springer Book Archive

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