87 citations · 90 across the 4 of their papers we have counts for
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The lens parallax method: determining the redshifts of the faint blue galaxies through gravitational lensing
Ramesh Narayan, Matthias Bartelmann
We propose a new technique, which we call the lens parallax method, to determine simultaneously the redshift distribution of the faint blue galaxies and the mass distribution of fo…
Arc Statistics with Realistic Cluster Potentials. II. Influence of Cluster Asymmetry and Substructure
Matthias Bartelmann, Matthias Steinmetz, Achim Weiss
We construct a sample of numerical models for clusters of galaxies and employ these to investigate their capability of imaging background sources into long arcs. Emphasis is laid o…
Cosmological Parameters from Angular Correlations between Qsos and Galaxies
Matthias Bartelmann
The angular two-point correlation function between background QSOs and foreground galaxies induced by gravitational lensing is derived. It is shown that the shape of this correlati…
Diffuse X-Ray Emission Around High-Redshift, Radio-Loud Qsos
Matthias Bartelmann, Peter Schneider, Guenther Hasinger
We announce the detection of correlations on angular scales of $\ga10'$ between optically bright, high-redshift, radio-loud QSOs with diffuse X-ray emission seen by ROSAT in the {\…