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- Tyndall National InstituteIE88 papers
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- Center for Astrophysics Harvard & SmithsonianUS34 papers
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46 papers · 1 filter
AGN jet physics from measurements of the frequency-dependent position of the VLBI radio core
Shane P. O'Sullivan, Denise C. Gabuzda
Accurate measurement of the frequency-dependent shift of the self-absorbed radio core is required for multi-frequency analysis of VLBI data since absolute positional information is…
Three dimensional magnetic field structure of six parsec-scale active galactic nuclei jets
Shane P. O'Sullivan, Denise C. Gabuzda
The parsec-scale Faraday rotation measure (RM) distribution of six "blazars" is investigated using multi-frequency (4.6--43 GHz) polarization observations taken on 2006 July 2 with…
Aligning VLBI Images of Active Galactic Nuclei at Different Frequencies
S. M. Croke, D. C. Gabuzda
Many important techniques for investigating the properties of extragalactic radio sources, such as spectral-index and rotation-measure mapping, involve the comparison of images at…
The 15--43-GHz Parsec-scale Circular Polarization of 41 Active Galactic Nuclei
V. M. Vitrishchak, D. C. Gabuzda, E. A. Rastorgueva +2
We present the results of parsec-scale circular polarization (CP) measurements based on VLBA data for a number of radio-bright, core-dominated AGN obtained simultaneously at 15, 22…
IR Contamination in Galactic X-Ray Novae
Mark T. Reynolds, Paul J. Callanan, Edward L. Robinson +1
The most widely used means of measuring the mass of black holes in Galactic binaries - specifically the X-ray novae - involves both radial velocity measurements of the secondary st…
Parsec-scale Investigation of the Magnetic Field Structure of Several AGN Jets
Shane P. O'Sullivan, Denise C. Gabuzda
Multi-frequency (4.6, 5, 5.5, 8, 8.8, 13, 15, 22 & 43 GHz) polarization observations of 6 "blazars" were obtained on the American Very Long Baseline Array (VLBA) over a 24-hr perio…