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Quasar Candidates in the Field of S.A. 94 (2h53m+0°20′)

  • C. Barbieri
  • S. Cristiani
Chapter
Part of the Astrophysics and Space Science Library book series (ASSL, volume 121)

Abstract

Inspection by eye of objective-prism plates taken with Schmidt telescopes is a well established technique (Smith, 1978, 1981) to identify large numbers of quasar candidates. The combination of thin prism and IIIa-J emulsion is particularly effective in picking up QSOs in the redshift interval 1.8 to 3.5, namely when the strong Lyα emission falls in the sensitivity range of the system. Quasars of lower redshift are also detected from the C IV 1549 Å, C III] 1909 Å, Mg II 2798 Å or by their ultraviolet continuum. Although selection effects, only partially alleviated by the adoption of automated searching techniques, strongly affect this kind of surveys, this method remains the most successful for discovering qusars. When complemented by different techniques, it can provide reasonable completeness (e.g. Cristiani, Véron-Cetty, Véron 1984).

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Copyright information

© Springer Science+Business Media Dordrecht 1986

Authors and Affiliations

  • C. Barbieri
    • 1
  • S. Cristiani
    • 1
    • 2
  1. 1.Istituto di AstronomiaUniversitá di PadovaItaly
  2. 2.European Southern ObservatoryCasilla, Santiago 19Chile

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