Results 91 to 100 of about 9,886 (203)
Superluminal motion in the quasar 3C 279
The Astrophysical Journal, 1989 VLBI maps of the quasar 3C 279 have been made at 5, 11, and 22 GHz, at several epochs between 1981 and 1985, to study the varying structure of the compact radio source. Spectra derived from the maps show that the NE component has the highest turnover frequency, and thus probably represents the core of the source.
S. C. Unwin +4 more
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Evolution of the Termination Region of the Parsec-scale Jet of 3C 84 Over the Past 20 yr
The Astrophysical JournalWe present the kinematics of the parsec-scale jet in 3C 84 from 2003 November to 2022 June observed with the Very Long Baseline Array at 43 GHz. We find that the C3 component, a bright feature at the termination region of the jet component ejected from ...
Minchul Kam +6 more
doaj +1 more source
Superluminal apparent motions in distant radio sources [PDF]
American Journal of Physics, 2005 We derive the prediction of the standard model of superluminal radio sources for the apparent transverse velocity of a radio source located at redshift z. The apparent velocity of the source is reduced by a factor of 1+z compared to that of a similar nearby source.
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Extending Special Relativity to Superluminal Motion
, 2009 Experiments done with single photon in the early 1990's produced a surprising result: that single photon pass through a photon tunnel barrier with a group velocity faster than the vacuum speed of light. Recently, a series of experiments revealed that electromagnetic wave was able to travel at a group velocity faster than $c$.
Wu, Xiang-Yao +3 more
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Superluminal phase and group velocities: A tutorial on Sommerfeld's\n phase, group, and front velocities for wave motion in a medium, with\n applications to the "instantaneous superluminality" of electrons [PDF]
, 2011 R. Y. Chiao
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The Evolutionary Unified Scheme, Jet Asymmetry, and Superluminal Motion [PDF]
Symposium - International Astronomical Union, 1996 The evolutionary unified scheme (Vagnetti et al., 1991; Vagnetti and Spera, 1994) is the first attempt to describe the radio source populations accounting at the same time for their cosmic evolution and their anisotropic phenomena. It achieves an interconnection between anisotropy and evolution through a changing balance between two optical components,
openaire +2 more sources
Chandra Study of the Proper Motion of HST-1 in the Jet of M87
The Astrophysical JournalThe radio galaxy M87 is well known for its jet, which features a series of bright knots observable from radio to X-ray wavelengths. We analyze the X-ray image and flux variability of the knot HST-1 in the jet.
Rameshan Thimmappa +4 more
doaj +1 more source
UniverseThe prominent radio quasar PKS 2215+020 (J2217+0220) was once labelled as a new laboratory for core–jet physics at redshift z=3.572 because of its exceptionally extended jet structure traceable with very long baseline interferometric (VLBI) observations ...
Sándor Frey +6 more
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ERRATUM: “MOJAVE. X. PARSEC-SCALE JET ORIENTATION VARIATIONS AND SUPERLUMINAL MOTION IN ACTIVE GALACTIC NUCLEI” (2013, AJ, 146, 120) [PDF]
, 2016 M. L. Lister +9 more
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The Astrophysical JournalThe arrival of gravitational wave astronomy and a growing number of time-domain-focused observatories are set to lead to an increasing number of detections of short gamma-ray bursts (GRBs) launched with a moderate inclination to Earth.
Geoffrey Ryan +5 more
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