David H. Roberts
William R. Kenan Jr. Professor of Astrophysics
Ph.D., Stanford University, 1973
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.CV and list of publications
Recent Ph.D. Students
Andreas Rauch (2013) "A New Method of Constraining the Orientation Of Radio-loud Quasars on kpc Scales" Present Position: TBA
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
D. H. Roberts, J. F. C. Wardle, M. R. Bell, M. R. Mallory, V. V. Marchenko, & P. U. Sanderbeck, “Structure and Magnetic Fields in the Precessing Jet System SS433 II. Intrinsic Luminosities of the Jets,’’ Astrophysical Journal, 719, 1918–1925 (2010).
Roberts, David H., Wardle, John F. C., Lipnick, Scott L.,* Selesnick, Philip L.,* & Slutsky, Simon*. "Structure and Magnetic Fields in the Precessing Jet System SS 433. I. Multifrequency Imaging from 1998." Astrophysical Journal 676. March 20, 2008 (2008): 584-593.
Roberts, David H with Cheung C., Wardle, J., Moellenbrock, G., & Homan, D.. "Multi-Frequency VSOP and VLBA Polarization Observations on 3C279 and 3C345." Future Directions in High Resoultion Radio Astronomy (2005): 174-176.
Roberts, David H with Aller, H, Aller, M., Huges, P., Homan, D. & Wardle, J.. "Observations of Oblique Polarization Structures in Active Extragalactic Radio Jets." Future Directions in High Resolution Radio Astronomy. Jonathan D. Romney and Mark J. Reid (Astron. Soc. Pacific), 2005. 165-167.
Roberts, David H with Chen T., Wardle, J., Cheung, C., & Moellenbrock, G.. "HALCA and VLBA Observations of 3C454.3." Future Directions in High Resolution Radio Astronomy. Jonathan D. Romney and Mark J. Reid (Aston, Soc. Pacific), 2005. 77-81.
Roberts, David H with Ojha R. Wardle, J. Horman, D., Aller, M., Aller, H., & Hughes, P.. "VLBI Polarimetry: A Faraday Screen in 3C273?." Future Directions in High Resolution Radio Astronomy. Jonathan D. Romney and Mark J. Reid, ( Astron. Soc. Pacific), 2005. 195-197.