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Record Details

Record 5 of 403
High-Frequency Observations of Blazars
Offline Availability: Go to Request Form
Author and Affiliation:
Marscher, A. P.(Boston Univ., Inst. for Astrophysical Research, Boston, MA United States)
Marchenko-Jorstad, S. G.(Boston Univ., Inst. for Astrophysical Research, Boston, MA United States)
Mattox, J. R.(Boston Univ., Inst. for Astrophysical Research, Boston, MA United States)
Wehrle, A. E.(Jet Propulsion Lab., Pasadena, CA United States)
Aller, M. F.(Michigan Univ., Astronomy Dept., Ann Arbor, MI United States)
Abstract: We report on the results of high-frequency VLBA observations of 42 gamma ray bright blazars monitored at 22 and 43 GHz between 1993.9 and 1997-6. In 1997 the observations included polarization-sensitive imaging. The cores of gamma ray blazars are only weakly polarized, with EVPAs (electric-vector position angles) usually within 40 degrees of the local direction of the jet. The EVPAs of the jet components are usually within 20 degrees of the local jet direction. The apparent speeds of the gamma ray bright blazars are considerably faster than in the general population of bright compact radio sources. Two X-ray flares (observed with RXTE) of the quasar PKS 1510-089 appear to be related to radio flares, but with the radio leading the X-ray variations by about 2 weeks. This can be explained either by synchrotron self-Compton emission in a component whose variations are limited by light travel time or by the Mirror Compton model.
Publication Date: Jan 01, 2000
Document ID:
20020039933
(Acquired Apr 26, 2002)
Subject Category: SPACE RADIATION
Document Type: Reprint
Publication Information: Astrophysical Phenomena Revealed by Space VLBI; 39-46
Contract/Grant/Task Num: NAG5-7323; NAG5-2508; NSF AST-98-02941
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
National Science Foundation; United States
Organization Source: Boston Univ.; Inst. for Astrophysical Research; Boston, MA United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: HIGH FREQUENCIES; GAMMA RAYS; BLAZARS; RADIO EMISSION; VERY LONG BASELINE ARRAY (VLBA); X RAY TIMING EXPLORER; QUASARS; X RAYS
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