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2003MNRAS.345.1351E - Mon. Not. R. Astron. Soc., 345, 1351-1364 (2003/November-2)
Fitting gravitational lenses: truth or delusion.
EVANS N.W. and WITT H.J.
Abstract (from CDS):
We use this new algorithm to examine some of the claims made for anomalous flux ratios. It has been argued that such anomalies betray the presence of substantial amounts of substructure in the lensing galaxy. We demonstrate by explicit construction that some of the lens systems for which substructure has been claimed can be well fitted by smooth lens models. This is especially the case when the systematic errors in the flux ratios (caused by microlensing or differential extinction) are taken into account. However, there is certainly one system (B1422+231) for which the existing smooth models are definitely inadequate and for which substructure may be implicated.
Within a few tens of kpc of the lensing galaxy centre, dynamical friction and tidal disruption are known to be very efficient at dissolving any substructure. Very little substructure is projected within the Einstein radius. The numbers of strong lenses for which substructure is currently being claimed may be so large that this contradicts rather than supports cold dark matter theories.
Abstract Copyright: 2003 RAS
Journal keyword(s): gravitational lensing - galaxies: elliptical and lenticular, cD - galaxies: structure - dark matter
Simbad objects: 27
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