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Counts of Optically Selected Quasars in the Magnitude Range 19<J<22

Published online by Cambridge University Press:  19 July 2016

V. Zitelli ,
B. Marano  and
G. Zamorani
V. Zitelli
Affiliation:
1- Dipartimento di Astronomia via Zamboni 33, 40126 Bologna (Italy)
B. Marano
Affiliation:
1- Dipartimento di Astronomia via Zamboni 33, 40126 Bologna (Italy)
G. Zamorani
Affiliation:
2- Istituto di Radioastronomia via Irnerio 46, 40126 Bologna (Italy)

Abstract

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We present the current status of a survey of faint, optically selected quasars covering 0.7 square degrees. Candidates have been selected through multicolour search, grism spectroscopy, and, to some extent, variability analysis. Slit spectroscopy for almost all the high priority candidates brighter than J=20.84 yielded 22 confirmed quasars. In the magnitude range J=21–22 our results are in very good agreement with other existing surveys. The extension of the survey on an adjacent field is in progress.

Type
Chapter XI: Quasi-Stellar Objects: Distribution and General Properties
Information
Symposium - International Astronomical Union , Volume 124: Observational Cosmology , 1987 , pp. 657 - 659
Copyright
Copyright © Reidel 1987 

References

Crampton, D., Schade, D., and Cowley, A.P. 1985, A.J., 90, 987 Google Scholar
Koo, D.C., and Kron, R.G. 1982, Astr. Ap., 105, 107.Google Scholar
Koo, D.C., Kron, R.G., and Cudworth, K.M. 1986, P.A.S.P., 98, 285.Google Scholar
Marano, B., Zamorani, G., and Zitelli, V., 1986a, in “Structure and Evolution of Active Galactic Nuclei”, Giuricin, G. et al. eds., (Dordrecht: Reidel), 1985, p. 339 Google Scholar
Marano, B., Zamorani, G., and Zitelli, V., 1986b, Proc. of the “Convegno Nazionale Astronet 1984–1985”, Sedmak, G. ed., p. 401.Google Scholar
Marshall, H.L., Avni, Y., Braccesi, A., Huchra, J.P., Tananbaum, H., Zamorani, G., and Zitelli, V. 1984, Ap. J., 283, 50.Google Scholar
Mitchell, K.J., Warnock, A. III, and Usher, P.D. 1984, Ap. J. (Letters), 287, L3.CrossRefGoogle Scholar
Schmidt, M., and Green, R.F. 1983, Ap. J., 269, 352.Google Scholar
Shanks, T., Fong, R., and Boyle, B.J. 1986, Proc. of IAU Symp. No. 119 on “Quasars”, Swarup, G. and Kapahi, V.K. eds., (Dordrecht: Reidel), p. 37.Google Scholar
Zamorani, G., Zitelli, V., and Marano, B. 1986, Proc. of IAU Symp. No. 119 on “Quasars”, Swarup, G. and Kapahi, V. K. eds., (Dordrecht: Reidel), p. 33.Google Scholar