Imperial College London
Alternate

ProfessorDanielMortlock

Faculty of Natural Sciences, Department of Physics

Professor of Astrophysics and Statistics
 
 
 
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Contact

 

+44 (0)20 7594 7878d.mortlock Website

 
 
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Location

 

1018ABlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Mortlock:2000:10.1046/j.1365-8711.2000.03891.x,
author = {Mortlock, DJ and Webster, RL},
doi = {10.1046/j.1365-8711.2000.03891.x},
journal = {Monthly Notices of the Royal Astronomical Society},
pages = {860--871},
title = {Gravitational lensing by elliptical galaxies.},
url = {http://dx.doi.org/10.1046/j.1365-8711.2000.03891.x},
volume = {319},
year = {2000}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The fraction of high-redshift sources which are multiply-imaged byintervening galaxies is strongly dependent on the cosmological constant, and so can be a useful probe of the cosmological model. However its power is limited by various systematic (and random) uncertainties in the calculation of lensing probabilities, one of the most important of which is the dynamical normalisation of elliptical galaxies. Assuming ellipticals' mass distributions can be modelled as isothermal spheres, the mass normalisation depends on: the velocity anisotropy; the luminosity density; the core radius; and the area over which the velocity dispersion is measured. The differences in the lensing probability and optical depth produced by using the correct normalisation can be comparable to the differences between even the most extreme cosmologicalmodels. The existing data is not sufficient to determine the correctnormalisation with enough certainty to allow lensing statistics to be used to their full potential. However, as the correct lensing probability is almostcertainly higher than is usually assumed, upper bounds on the cosmological constant are not weakened by these possibilities.
AU  - Mortlock,DJ
AU  - Webster,RL
DO  - 10.1046/j.1365-8711.2000.03891.x
EP  - 871
PY  - 2000///
SN  - 0035-8711
SP  - 860
TI  - Gravitational lensing by elliptical galaxies.
T2  - Monthly Notices of the Royal Astronomical Society
UR  - http://dx.doi.org/10.1046/j.1365-8711.2000.03891.x
UR  - https://academic.oup.com/mnras/article/319/3/860/1075015
UR  - http://hdl.handle.net/10044/1/58639
VL  - 319
ER  -
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