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A search for homogeneous samples of quasars

  • V Quasars
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Large-Scale Structures in the Universe Observational and Analytical Methods

Part of the book series: Lecture Notes in Physics ((LNP,volume 310))

Abstract

An automated search for quasars, based on MRSP software, is applied to low-dispersion objective prism plates. Two criteria are used. The first criterion is the UV excess of low and medium redshift quasars. The second criterion is the presence of emission lines. 25 000 non-overlapping spectra in the ESO/SRC field No. 411 were analyzed; 600 show UV excess, 2 500 spectra have apparent emission lines. Both criteria taken separately lead to a large number of “false” objects. In the combined feature space known quasars occupy a characteristic region. Among the objects from this region in the limited magnitude range 18m – 19m 600 quasar candidates were found. Redshifts were determined from the low-dispersion objective prism spectra for 255 of these objects. The spatial distribution of 158 Ly α quasars is discussed.

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Authors and Affiliations

  1. Astronomisches Institut, Westfälische Wilhelms-Universität, Münster, F.R. Germany

    Volker Gericke

Authors
  1. Volker Gericke
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Editor information

W. C. Seitter H. W. Duerbeck M. Tacke

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© 1988 Springer-Verlag

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Gericke, V. (1988). A search for homogeneous samples of quasars. In: Seitter, W.C., Duerbeck, H.W., Tacke, M. (eds) Large-Scale Structures in the Universe Observational and Analytical Methods. Lecture Notes in Physics, vol 310. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-50135-5_75

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  • DOI: https://doi.org/10.1007/3-540-50135-5_75

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-50135-0

  • Online ISBN: 978-3-540-45938-5

  • eBook Packages: Springer Book Archive

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