Abstract
We describe how the application of technigues which utilise all the information contained in multi-colour surveys of stellar-like objects can be employed to detect guasars over an extended redshift range. The method is particularly effective for the identification of guasars with redshifts z>2.2 where the application of the ultra-violet excess criterion breaks down. Spectroscopy of a small sample of objects from the first survey field has resulted in the detection of two new faint guasars with redshifts z=3.42 and z=4.01 (ref. 1).
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References
Warren, S.J., Hewett, P.C., Irwin, M.J., McMahon, R.G., Bridgeland, M.T., Bunclark, P.S. and Kibblewhite, E.J. Nature (in the press).
Hazard, C., McMahon, R.G. and Sargent, W.L.W. Nature 322, 38–40 (1986).
Koo, D.C., Kron, R.G. and Cudworth, K.M. P.A.S.P. 98, 285–306 (1986).
Osmer, P.S. Astrophys. J. 253, 28–37 (1982).
Schmidt, M., Scheider, D.P. and Gunn, J.E. Astrophys. J. (in the press).
Koo, D.C. Astronom. J. 90, (3), 418–440 (1985).
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© 1987 IAU
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Warren, S.J., Hewett, P.C., Irwin, M.J. (1987). A Multi-Colour Survey For High-Redshift Quasars. In: Hewitt, A., Burbidge, G., Fang, L.Z. (eds) Observational Cosmology. International Astronomical Union/ Union Astronomique Internationale, vol 124. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3853-3_73
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DOI: https://doi.org/10.1007/978-94-009-3853-3_73
Publisher Name: Springer, Dordrecht
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