Gravitational lensing statistics based on a large sample of highly luminous quasars

Surdej, Jean; Claeskens, Jean-François; Crampton, D.; Filippenko, A. V.; Hutsemekers, Damien; Magain, Pierre; Pirenne, B.; Vanderriest, C.; Yee, H. K. C.

doi:10.1086/116584

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Gravitational lensing statistics based on a large sample of highly luminous quasars

Surdej, Jean; Claeskens, Jean-François; Crampton, D. et al.

1993 • In Astronomical Journal, 105, p. 2064-2078

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10.1086/116584

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Keywords :

GRAVITATIONAL LENSES; QUASARS; COSMOLOGY; GALAXIES

Abstract :

[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)

Claeskens, Jean-François

Crampton, D.

Filippenko, A. V.

Hutsemekers, Damien ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Magain, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image

Pirenne, B.

Vanderriest, C.

Yee, H. K. C.

Language :

English

Title :

Gravitational lensing statistics based on a large sample of highly luminous quasars

Publication date :

June 1993

Journal title :

Astronomical Journal

ISSN :

0004-6256

eISSN :

1538-3881

Publisher :

Univ Chicago Press, Chicago, United States - Illinois

Volume :

105

Pages :

2064-2078

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/1993AJ....105.2064S

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