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John F.C. Wardle wardle@brandeis.edu
Professor of
Astrophysics |
John Wardle studies powerful extragalactic radio sources and especially the nuclei of quasars using the Very Large Array and the Very Long Baseline Array of the National Radio Astronomy Observatory. He specializes in making polarization observations of quasars to map the magnetic fields near the super-massive black holes at the heart of these objects. Recent results include the first detections of circular polarization at milli-arcsecond resolution, and a new technique for measuring the distance to high redshift quasars. Professor Wardle is a member of the Brandeis Astrophysics group.
Recently taught courses:
Phsc 2b -- "Introductory Astronomy;" Phys 20b -- "Modern Physics;" Phys 168b -- "Astrophysics."
Recent Ph.D. Students:
Tingdong Chen (2005) “VLBI and VSOP Study of Two Quasar Jets&rdquo
Chi (Teddy) Cheung (2004) “Studies of the Kilo-parsec Scale Radio and Optical Emission from X-ray Jets in Active Galactic Nuclei” Present Position: Postdoctoral Fellow, Kavli Institute for Particle Astrophysics & Cosmology,Stanford University, Stanford CA
Daniel C. Homan (2000) "Polarization Studies of the Parsec Scale Jets in AGN." Present position: Assistant Professor, Department of Physics & Astronomy, Denison University, Granville, OH
(CV and publications) (complete list of publications from ADS)
Sample of Recent
Publications:
"Concurrent 43 and 86 GHz Very Long Baseline Polarimetry of 3C273"
(with J. Attridge and D. Homan) Astrophys.
J. in press. astro-ph/0506243
"Discovery of Optical Emission in the Hot Spots of Three 3CR Quasars: High-Energy Particle Acceleration in Powerful Radio Hot Spots" (with C. Cheung and T. Chen) Astrophys. J. 628, 104 (2005). astro-ph/0503634
"High Levels of Circularly Polarized Emission from the Radio Jet in NGC 1275 (3C 84)" (with D. Homan) Astrophys. J. Letters, 602, 13 (2004). astro-ph/0401319
"Parsec-Scale Blazar Monitoring: The Data" (with R. Ojha, D. homan, D. Roberts, M. Aller, H. Aller and P. Hughes) Astrophys. J. Suppl., 150, 187 (2004). [reprint]
"PKS 1510-089: A Head-on View of a Relativistic Jet" (with D. Homan, C.Cheung, D. Roberts and J. Attridge) Astrophys. J., 580, 742 (2002).