1999A&AS..136..297H


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST13:31:09

1999A&AS..136..297H - Astron. Astrophys., Suppl. Ser., 136, 297-305 (1999/April-2)

Gravitational lensing statistics with extragalactic surveys. II. Analysis of the Jodrell Bank-VLA Astrometric Survey.

HELBIG P., MARLOW D., QUAST R., WILKINSON P.N., BROWNE I.W.A. and KOOPMANS L.V.E.

Abstract (from CDS):

We present constraints on the cosmological constant λ0 from gravitational lensing statistics of the Jodrell Bank-VLA Astrometric Survey (JVAS). Although this is the largest gravitational lens survey which has been analysed, cosmological constraints are only comparable to those from optical surveys. This is due to the fact that the median source redshifts of JVAS are lower, which leads to both relatively fewer lenses in the survey and a weaker dependence on the cosmological parameters. Although more approximations have to be made than is the case for optical surveys, the consistency of the results with those from optical gravitational lens surveys and other cosmological tests indicate that this is not a major source of uncertainty in the results. However, joint constraints from a combination of radio and optical data are much tighter. Thus, a similar analysis of the much larger Cosmic Lens All-Sky Survey should provide even tighter constraints on the cosmological constant, especially when combined with data from optical lens surveys. At 95% confidence, our lower and upper limits on λ00, using the JVAS lensing statistics information alone, are respectively -2.69 and 0.68. For a flat universe, these correspond to lower and upper limits on λ0 of respectively -0.85 and 0.84. Using the combination of JVAS lensing statistics and lensing statistics from the literature as discussed in Quast & Helbig (1999) the corresponding λ0 - Ω0 values are -1.78 and 0.27. For a flat universe, these correspond to lower and upper limits on λ0 of respectively -0.39 and 0.64.

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Journal keyword(s): gravitational lensing - cosmology: theory - cosmology: observations

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 QSO B0218+357 QSO 02 21 05.5 +35 56 14   20.0 20.0 19.60   ~ 488 3
2 4C 05.19 QSO 04 14 37.76781859 +05 34 42.3354282   24.100 23.800 21.270   ~ 321 2
3 QSO B1030+074 QSO 10 33 34.02429 +07 11 26.1478     20.34 20.22   ~ 93 1
4 QSO B1422+2309 QSO 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 407 1
5 [PBW92] 1422+231 gLS 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 354 0
6 BWE 1938+6641 gLe 19 38 25.32029 +66 48 53.4199           ~ 91 2
7 PKS J2116+0225 Rad 21 16 50.74430 +02 25 46.2580           ~ 54 2

    Equat.    Gal    SGal    Ecl

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2019.10.23-13:31:09

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