Other
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phdt........17m&link_type=abstract
PhD Thesis, University of Bonn, 2008.
Other
Gravitational Lenses
Scientific paper
Wide separation gravitational lens systems are good candidates to probe the mass distribution in group sized halos. Analysis of two wide separation lens systems are presented in this thesis. MG 2016+112 is a quadruply imaged lens system with a pair of merging partial images in the radio. The merging images are found to violate the expected mirror symmetry and clearly indicate an astrometric anomaly. Such an anomaly is of gravitational origin and arises due to substructure in the environment of lens galaxies. New high resolution multi-frequency VLBI radio observations were carried out to test previous mass models and were found to be inconsistent with the predictions of previous mass models. New mass models were explored which quantitatively attributed the astrometric anomaly to a dwarf galaxy known at the redshift of the lensing galaxy. The model predicted substructure mass fraction was found to be inconsistent with that expected from simulations.
B2108+213 the widest separation lens system found in CLASS shows two lensed images and a third component in the radio which could not be previously classified as either an AGN within the lens galaxy or a third lensed image. The lens galaxy G1 is a massive elliptical in the optical which is confirmed to belong to a galaxy group and has a companion galaxy G2 in the line-of-sight. Recent simulations of group galaxies suggest that transient steepening of the density profile arises from the interaction between lens galaxies and close companion galaxies. The new constraints from the high resolution VLBI observations were used to test various mass models. A profile steeper than isothermal was found to best fit the image positions and flux-density ratios which might be due to interaction between G1 and G2. The third radio component was confirmed as the AGN of the massive lens galaxy in the optical. This was further supported by the extended emission from the radio lobes detected in the new MERLIN imaging. The lens galaxy was found to be largely responsible for the wide image splitting with little contribution from the environment.
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