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2006MNRAS.365.1243D - Mon. Not. R. Astron. Soc., 365, 1243-1262 (2006/February-1)
Finite source effects in strong lensing: implications for the substructure mass scale.
DOBLER G. and KEETON C.R.
Abstract (from CDS):
In a separate analysis, we carefully study four observed radio lenses to determine which of the images are anomalous. In B0712+472, the evidence for a radio flux ratio anomaly is marginal, but if the anomaly is real then image C is probably the culprit. In B1422+231, the anomaly is in image A. Interestingly, B2045+265 and B1555+375 both appear to have two anomalous images. Coincidentally, in each system one of the anomalies is in image C, and the other is in either image A or image B (both possibilities lead to acceptable models). It remains to be seen whether ΛCDM predicts enough substructure to explain multiple anomalies in multiple lenses. When we finally join our modelling results and substructure theory, we obtain lower bounds on the masses of the substructures responsible for the observed anomalies. The mass bounds are broadly consistent with expectations for ΛCDM. Perhaps more importantly, we outline various systematic effects in the mass bounds; poor knowledge of whether the substructure lies within the main lens galaxy or elsewhere along the line of sight appears to be the dominant systematic.
Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS
Journal keyword(s): gravitational lensing - cosmology: theory - dark matter
Simbad objects: 22
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