Multifrequency radio VLBI observations of the superluminal low-frequency variable quasar NRAO 140

Details Multifrequency radio VLBI observations of the superluminal low-frequency variable quasar NRAO 140 Multifrequency radio VLBI observations of the superluminal low-frequency variable quasar NRAO 140

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..735m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 735-741. Research supported by the Boston Universit

Astronomy and Astrophysics

Astrophysics

37

Compton Effect, Extragalactic Radio Sources, Quasars, Relativistic Velocity, Very Long Base Interferometry, X Ray Sources, Astronomical Catalogs, Centimeter Waves, Plasma Jets, Radiant Flux Density, Radio Spectra

Scientific paper

VLBI maps of the quasar NRAO 140 at three wavelengths: 18, 6, and 2.8 cm are presented. The source consists of a jetlike structure delineated by a nearly colinear series of components which are progressively more compact toward the northwestern end of the source. The multifrequency observations make it possible to dissect accurately the spectrum of the source, which leads to an affirmation of the previously reported Compton problem and superluminal motion. The Compton problem requires relativistic motion with Doppler factor delta greater than 3.7. One of the components is separating from the 'core' at a rate of 0.15 milliarcsec/yr, which translates to an apparent velocity between 4c and 13c, depending on the values of H(0) and q(0). The energy in relativistic electrons in one of the components far exceeds the energy in magnetic field, but the total energy requirement need not exceed approximately 10 to the 54th ergs.

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