538 citations
- University of KansasUS22 papers
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17 papers · 1 filter
Significant Limb-Brightening in the Inner Parsec of Markarian 501
B. Glenn Piner, Niraj Pant, Philip G. Edwards +1
We present three 43 GHz images and a single 86 GHz image of Markarian 501 from VLBA observations in 2005. The 86 GHz image shows a partially resolved core with a flux density of ab…
The Parsec-Scale Jets of the TeV Blazars H 1426+428, 1ES 1959+650, and PKS 2155-304: 2001-2004
B. Glenn Piner, Niraj Pant, Philip G. Edwards
We present Very Long Baseline Array (VLBA) observations of the TeV blazars H 1426+428, 1ES 1959+650, and PKS 2155-304 obtained during the years 2001 through 2004. We observed H 142…
The VSOP 5 GHz Active Galactic Nucleus Survey: V. Imaging Results for the Remaining 140 sources
R. Dodson, E. B. Fomalont, K. Wiik +21
In February 1997, the Japanese radio astronomy satellite HALCA was launched to provide the space-bourne element for the VLBI Space Observatory Programme (VSOP) mission. Approximate…
Relativistic Jets in The Radio Reference Frame Image Database I: Apparent Speeds from the First Five Years of Data
B. G. Piner, M. Mahmud, A. L. Fey +1
(Abridged) We present the results of an analysis of relativistic jet apparent speeds from VLBI images in the Radio Reference Frame Image Database (RRFID). The images are snapshot V…
The Fastest Relativistic Jets: VLBA Observations of Blazars with Apparent Speeds Exceeding 25c
B. G. Piner, D. Bhattarai, P. G. Edwards +1
We have measured peak apparent speeds of 25.6 +/- 7.0c, 25.6 +/- 4.4c, and 28.2 +/- 6.6c in the jets of 0235+164, 0827+243, and 1406-076, respectively, based on six epochs of high-…
VLBA Polarization Observations of Markarian 421 After a Gamma-Ray High State
B. Glenn Piner, Philip G. Edwards
We present four high dynamic range, dual-circular polarization, Very Long Baseline Array (VLBA) observations at 22 GHz of Markarian 421, taken throughout the year following the sou…