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

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


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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  1. Arp, H., 1980: 9th Texas Symp., Munich (Ann. N. Y. Acad. Sci.) ed. J. Ehlers, J. J. Perry, M. Walker, p. 94.Google Scholar
  2. Arp, H., Sulentic, J. W., 1979: Astrophys. J. 229, 496.ADSCrossRefGoogle Scholar
  3. Bolton, J. B., Wall, J. V., 1970: Austr. J. Phys. 23, 789.ADSCrossRefGoogle Scholar
  4. Browne, J. W. A., Savage, A., 1977: Mon. Not. R. Astron. Soc. 179, 65P.ADSGoogle Scholar
  5. Clowes, R. G., Savage, A., 1983: Mon. Not. R. Astron. Soc. 204, 365.ADSGoogle Scholar
  6. Condon, J. J., Dressel, L. L., 1978: Astrophys. J. 221, 456.ADSCrossRefGoogle Scholar
  7. Cristiani, S., Véron-Cetty, M. P., Véron, P., 1984: Astron. Astrophys. 135, 122.ADSGoogle Scholar
  8. Haro, G., Luyten, W. J., 1962: Bol. Obs. Tonantzintla 3 (N°. 22), 37.ADSGoogle Scholar
  9. Huang, K. L., Usher, P. D., 1984: Astrophys. J. Suppl. 56, 393.ADSCrossRefGoogle Scholar
  10. Luyten, W. J., 1958: A Search for Faint Blue Stars — XVI Some Special Regions, Monnesota, Minneapolis.Google Scholar
  11. Mitchell, K. J., Warnock, A. III, Usher, P. D., 1984: Astrophys. J. 287, L3.ADSCrossRefGoogle Scholar
  12. Osmer, P. S., Smith, M. G., 1980: Astrophys. J. Suppl. 42, 333.ADSCrossRefGoogle Scholar
  13. Peterson, B. A., Bolton, J. G., 1972: Astrophys. J. 173, L19.ADSCrossRefGoogle Scholar
  14. Purgathofer, A. Th., 1969: Lowell Observatory Bull. 147, 98.ADSGoogle Scholar
  15. Savage, A., Wright, A. E., 1981: Mon. Not. R. Astron. Soc. 196, 927.ADSGoogle Scholar
  16. Smith, M. G., 1978: Vistas Astron. 22, 321.ADSCrossRefGoogle Scholar
  17. Smith, M. G., 1981: in Investigating the Universe, ed. F. D. Kahn (Reidel. Dordrecht), P. 151.CrossRefGoogle Scholar

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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