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Size of the Vela Pulsar's Emission Region at 18 cm Wavelength
C. R. Gwinn, M. D. Johnson, J. E. Reynolds +12
We present measurements of the linear diameter of the emission region of the Vela pulsar at observing wavelength lambda=18 cm. We infer the diameter as a function of pulse phase fr…
Noise in the Cross-Power Spectrum of the Vela Pulsar
C. R. Gwinn, M. D. Johnson, J. E. Reynolds +12
We compare the noise in interferometric measurements of the Vela pulsar from ground- and space-based antennas with theoretical predictions. The noise depends on both the flux densi…
VLBA monitoring of Mrk 421 at 15 GHz and 24 GHz during 2011
R. Lico, M. Giroletti, M. Orienti +13
High-resolution radio observations are ideal for constraining the value of physical parameters in the inner regions of active-galactic-nucleus jets and complement results on multiw…
Multi-wavelength Observations of PKS 2142-758 during an Active Gamma-Ray State
Michael Dutka, Roopesh Ojha, Katja Pottschmidt +10
PKS 2142-758 is a flat spectrum radio quasar which emits few, weak but significant gamma-ray flares in the MeV through GeV energy range. The first flare occured on April 4th, 2010,…
Increasing the Number of TeV Blazars with Parsec-Scale Kinematics
Vivian C. Tiet, B. Glenn Piner, Philip G. Edwards
We report on our observations of the parsec-scale radio jet structures of five blazars that have been detected by ground-based TeV gamma-ray telescopes. These five blazars all belo…
VLBA monitoring of Mrk 421 at 15 and 24 GHz during 2011
R. Lico, M. Giroletti, M. Orienti +13
We present a preliminary analysis of new high resolution radio observations of the nearby TeV blazar Markarian 421 (z=0.031). This study is part of an ambitious multifrequency camp…