The authors thank SAO/NASA ADS Astronomy Abstract Service for their deposit authorization. The original publication is available at http://www.iop.org/EJ/journal/aj.
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[en] Results on gravitational lensing statistics applied to a sample of 469 highly luminous quasars are reported. The objects were directly imaged, either from the ground under optimal seeing conditions, or using the HST. We have derived values for the effectiveness parameter F of galaxies, modeled by means of singular isothermal spheres, to produce macrolensed images of distant quasars, and upper limits on the density parameter Omega(L) of compact objects with masses between 10 exp 10 and 10 exp 12 solar masses. Adopting H(0)= 50 km/s/Mpc, Omega(0)= 1, and Lambda = 0, we find that at the 99.7 percent confidence level, F is between 0.005 and 0.478 and that Omega(L) is less than 0.02. A critical discussion of these results is presented. Finally, comparing the efficiencies of ground-based and space instruments used to search for gravitational lens systems among highly luminous quasars, we conclude that for the near future, ground-based direct imaging characterized by a good dynamical range still constitutes the best observational strategy.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Alcock, C., et al. 1992, in the Proceedings of the Hamburg Conference on Gravitational Lenses, Lecture Notes in Physics 406, 156, edited by R. Kayser, T. Schramm, and L. Nieser (Springer, Berlin)
Bahcall, J. N., Maoz, D., Doxsey, R., Schneider, D. P., Bahcall, N. A., Lahav, O., & Yanny, B. 1992a, ApJ, 387, 56
Bahcall, J. N., Maoz, D., Schneider, D. P., Yanny, B., & Doxsey, R. 1992b, ApJ, 392, L1
Bennett, D. P., et al. 1991, preprint
Blandford, R. D., & Narayan, R. 1992, ARA&A, 30, 311
Boyle, B. J., Shanks, T., & Peterson, B. A. 1988, MNRAS, 235, 935
Canizares, C. R. 1982, ApJ, 263, 508
Claeskens, J. F. 1992, Master thesis, Liège University
Crampton, D., McClure, R. D., Fletcher, J. M., & Hutchings, J. B. 1989, AJ, 98, 1188
Crampton, D., McClure, R. D., & Fletcher, J. M. 1992, preprint
Djorgovski, S., Perley, R., Meylan, G., & McCarthy, P. 1987, ApJ, 321, L17
Djorgovski, S., & Meylan, G. 1989a, in Active Galactic Nuclei, IAU Symposium No. 134, edited by D. Osterbrock and J. Miller (Kluwer, Dordrecht), p. 269
Djorgovski, S., & Meylan, G. 1989b, in Gravitational Lenses, edited by J. M. Moran et al. (Springer, New York), p. 173
Dyer, C. C., & Roeder, R. C. 1973, ApJ, 180, L31
Fukugita, M., & Turner, E. L. 1991, MNRAS, 253, 99 (FT)
Fukugita, M., Futamase, T., & Kasai, M. 1990, MNRAS, 246, 24P (FFK)
Fukugita, M., Futamase, T., Kasai, M., & Turner, E. L. 1992, ApJ, 393, 3
Hartwick, F. D. A., & Schade, D. 1990, ARA&A, 28, 437
Hewitt, J. N. 1986, Ph.D. thesis, MIT
Jaroszynski, M. 1991, MNRAS, 249, 430
Kassiola, A., Kovner, I., & Blandford, R. 1991, ApJ, 381, 6
Kochanek, C. 1991a, private communication
Kochanek, C. S. 1991b, ApJ, 379, 517
Kochanek, C. S. 1991c, preprint
Magain, P., Surdej, J., Swings, J. P., Borgeest, U., Kayser, R., Kühr, H., Refsdal, S., & Remy, M. 1988, Nature, 334, 325
Magain, P., Remy, M., Surdej, J., Swings, J. P., & Smette, A. 1990, in Lecture Notes in Physics, Gravitational Lensing, Proceedings of the Toulouse Workshop on Gravitational Lenses, September 1989, edited by Y. Mellier, B. Fort, and G. Soucail (Springer, Berlin), Vol. 360, 88
Magain, P., Hutsemékers, D., Surdej, J., & Van Drom, E. 1992a, in the Proceedings of the Hamburg Conference on Gravitational Lenses, Lecture Notes in Physics 406, edited by R. Kayser, T. Schramm, and L. Nieser (Springer, Berlin), p. 88
Refsdal, S. 1990, review paper in Lecture Notes in Physics, Gravitational Lensing, Proceedings of the Toulouse Workshop on Gravitational Lenses, September 1989, edited by Y. Mellier, B. Fort, and G. Soucail (Springer, Berlin), Vol. 360, p. 13
Schneider, P. 1991, MPA preprint 584
Surdej, J., et al. 1987, Nature 329, 695
Surdej, J., et al. 1988a, A&A, 198, 49
Surdej, J., Magain, P., Swings, J. P., Remy, M., Borgeest, U., Kayser, R., Refsdal, S., & Kühr, H. 1988b, invited paper to the First D.A.E.C. workshop on Large Scale Structures, proceedings edited by C. Balkowski and S. Gordon, p. 95
Surdej, J., et al. 1988c, Astron. Soc. of the Pac. Conf. Series 2, 183
Surdej, J., et al. 1989, The Messenger, 55, 8
Surdej, J. 1990, review paper in Lecture Notes in Physics, Gravitational Lensing, Proceedings of the Toulouse Workshop on Gravitational Lenses, September 1989, edited by Y. Mellier, B. Fort, and G. Soucail (Springer, Berlin), Vol. 360, pp. 57, 311
Surdej, J., et al. 1992a, invited paper to the Second D.A.E.C. meeting on the Distribution of Matter in the Universe, edited by G. A. Mamon and D. Gerbal, p. 97
Surdej, J., Claeskens, J. F., Hutsemékers, D., Magain, P., & Pirenne, B. 1992b, in the Proceedings of the Hamburg Conference on Gravitational Lenses, Lecture Notes in Physics 406, edited by R. Kayser, T. Schramm, and L. Nieser (Springer, Berlin), p. 27
Surdej, J. et al. 1993, in preparation
Swings, J. P., Magain, P., Remy, M., Surdej, J., Smette, A., Hutsemékers, D., & Van Drom, E. 1990, in Lecture Notes in Physics, Gravitational Lensing, Proceedings of the Toulouse Workshop on Gravitational Lenses, September 1989, edited by Y. Mellier, B. Fort, and G. Soucail (Springer, Berlin), Vol. 360, p. 83
Turner, E. L. 1990, ApJ, 365, L43
Turner, E. L., Ostriker, J. P., & Gott III, J. R. 1984, ApJ, 284, 1 (TOG)
Van Drom, E. 1992, in the Proceedings of the Hamburg Conference on Gravitational Lenses, Lecture Notes in Physics 406, edited by R. Kayser, T. Schramm, and L. Nieser (Springer, Berlin), p. 250
Van Drom, E., Surdej, J., Hutsemékers, D., Magain, P., Gosset, E., Shaver, P., & Melnick, J. 1993, A&A (submitted)
Véron-Cetty, M. P., & Véron, P. 1987, ESO Scientific Report No. 5
Véron-Cetty, M. P., & Véron, P. 1991, ESO Scientific Report No. 10
Vidal-Madjar, A., Aubourg, E., Kunth, D., Ferlet, R., & Mochkovitch, R. et al. 1992, invited paper to the Second D.A.E.C. Workshop on Large Scale Structures in the Universe (in press)
Wallington, S., & Narayan, R. 1992, preprint
Weymann, R. J., Latham, D., Angel, J. R. P., Green, R. F., Liebert, J. W., Turnshek, D. A., Turnshek, D. E., & Tyson, J. A. 1980, Nature 285, 641
Yee, H. K. C., Filippenko, A. V., & Tang, D. 1993, AJ, 105, 7