David H. Roberts
William R. Kenan Jr. Professor of Astrophysics, Emeritus
Degree
PhD, Stanford University, 1973
Research
David Roberts is engaged in high resolution astronomical observations of active galaxies (quasars, radio and Seyfert galaxies, and BL Lacertae objects) at wavelengths covering the entire electromagnetic spectrum. This is carried out with the Very Large Array and the Very Long Baseline Array, including its extension into space with the HALCA satellite. He is particularly interested in linear polarization observations in order to study the magnetic field structure in active galactic nuclei. Professor Roberts is a member of the Brandeis Astrophysics group.
Complete list of publications from ads
Recent PhD Students
Andreas Rauch (2013) "A New Method of Constraining the Orientation Of Radio-loud Quasars on kpc Scales" Present Position: Otto Hahn Gymnasium, Gottingen, Germany
Michael Bell (2010) "Two-Frequency, Multi-epoch VLA Observations of SS 433". Present Position: Postdoctoral Researcher, Max Planck Institute, Germany
George Moellenbrock (1999) " VLBA Polarization Observations of Gamma-Ray Blazars at 15 and 22 GHz " Present Position: Assistant Scientist, AIPS + + Project, National Radio Astronomy Observatory, Socorro, NM
Joanne Attridge (1999) "Magnetic Field Structures in the Parsec-Scale Radio Jets of Blazars" Present Position: Senior Systems Engineer, Integrated Defense Systems, Raytheon Electronic Systems, Bedford, MA
Sample of Recent Publications
“The Abundance of X-shaped Radio Sources. I. VLA Survey of 52 Sources with Off-axis Distortions” Roberts, David H.; Cohen, Jake P.; Lu, Jing; Saripalli, Lakshmi; Subrahmanyan, Ravi; Astrophys. J. Supplement, vol 220, p7 (2015)
“The Abundance of X-shaped Radio Sources: Implications for the Gravitational Wave Background” Roberts, David H.; Saripalli, Lakshmi; Subrahmanyan, Ravi; Astrophys. J. vol 801, p 6 (2015)
“The Structure and Linear Polarization of the Kiloparsec-scale Jet of the Quasar 3C 345” Roberts, David H.; Wardle, John F. C.; Marchenko, Valerie V.; Astron. J. vol 145, p 49 (2013)
“Evidence for Highly Relativistic Velocities in the Kiloparsec-scale Jet of the Quasar 3C 345” Roberts, David H.; Wardle, John F. C.; Astrophys. J. vol 759 p 35 (2012)
“Structure and Magnetic Fields in the Precessing Jet System SS 433. III. Evolution of the Intrinsic Brightness of the Jets from a Deep Multi-epoch Very Large Array Campaign” Bell, Michael R.; Roberts, David H.; Wardle, John F. C.; Astrophys. J. vol 736, p 118 (2011)
“Structure and Magnetic Fields in the Precessing Jet System SS 433. II. Intrinsic Brightness of the Jets” Roberts, David H.; Wardle, John F. C.; Bell, Michael R.; Mallory, Matthew R.; Marchenko, Valerie V.; Sanderbeck, Phoebe U.; Astrophys. J. vol 719, p 1918 (2010)