6 papers
Polarisation as a Tool for Gravitational Microlensing Surveys
J. F. L. Simmons, J. P. Willis, A. Newsam
Much interest has been generated recently by the ongoing MACHO, EROS and OGLE projects to identify gravitationally lensed stars from the Large Magellanic Cloud and Galactic bulge,…
Bias Minimisation in POTENT
A. Newsam, J. F. L. Simmons, M. A. Hendry
Much current interest in cosmology has revolved around the peculiar velocity field of galaxies. Many methods have been proposed to derive this, probably the most prominent being PO…
Optimal Reconstruction of the Velocity and Density Field: Potent and Max-Flow Algorithms
J. F. L. Simmons, A. Newsam, M. A. Hendry
Although Potent purports to use only radial velocities in reconstructing the potential velocity field of galaxies, the derivation of transverse components is implicit in the smooth…
What Do We Mean by Malmquist Bias?
Martin A. Hendry, John F. L. Simmons, Andrew M. Newsam
In this paper we review the two main approaches to the problem of Malmquist bias which have been adopted in the cosmology literature, and show how these two formulations of the pro…
Bias in Velocity Field Recoveries
Andrew Newsam, John F. L. Simmons, Martin Hendry
We investigate the effect of using different distance estimators on the recovery of the peculiar velocity field of galaxies using Potent. An inappropriate choice of distance estima…
Potent and Max-Flow Algorithms
John F. L. Simmons, Andrew Newsam, Martin Hendry
Although Potent purports to use only radial velocities in retrieving the potential velocity field of galaxies, the derivation of transverse components is implicit in the smoothing…