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Title:
Compact radio sources - The dependence of variability and polarization on spectral shape
Authors:
Rudnick, L.; Jones, T. W.
Affiliation:
AA(Minnesota, University, Minneapolis, MN), AB(Minnesota, University, Minneapolis, MN)
Publication:
Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 39-47. (ApJ Homepage)
Publication Date:
04/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
LINE SHAPE, POLARIZATION CHARACTERISTICS, QUASARS, RADIO SOURCES (ASTRONOMY), BL LACERTAE OBJECTS, DEPOLARIZATION, FARADAY EFFECT
Comment:
A&AA ID. AAA031.141.045
DOI:
10.1086/159800
Bibliographic Code:
1982ApJ...255...39R

Abstract

The polarization properties and variability of a sample of flat-spectrum compact radio sources have been investigated. An unbiased sample of 40 sources selected from the S4 (6-cm strong source) survey was observed at 20, 6 and 2 cm by the VLA, and flux variability was estimated by comparison with the original survey results. Observations reveal significant differences in flux variability and polarization characteristics between sources of different spectral shapes. Those with straight spectra are noted to be small in comparison with steeper-spectrum sources, are not variable and show evidence for Faraday depolarization, possibly corresponding to transparent sources confined within a galaxy. Sources with simple convex spectral shapes vary only slightly and have small polarizations which are similar between frequencies; they may be interpreted by nonpower-law electron distributions. Complex sources are highly variable and show considerable scatter between fractional polarizations at different wavelengths, very similar to the strong millimeter active sources.

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