Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220l..31s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 220, Mar. 1, 1978, p. L31-L36.
Astronomy and Astrophysics
Astronomy
39
Galactic Structure, Optical Polarization, Polarimetry, Quasars, Radio Astronomy, Electron Density (Concentration), Faraday Effect, Galactic Nuclei, Interstellar Magnetic Fields, Polarization Characteristics, Synchrotron Radiation
Scientific paper
Photoelectric polarization maps of the jets associated with M87 and 3C 273 are presented. For the M87 jet, polarization of individual knots reaches 20%. Comparison of the complex position-angle structures at optical and radio frequencies (1) indicates the presence of a uniform (scale length at least about 1.5 kpc) medium in the vicinity of M87 which causes a Faraday rotation along the line of sight greater than approximately 360 rad/sq m and (2) places an upper limit on the amount of Faraday depolarization occurring within individual knots. For the 3C 273 jet as a whole, observations yield a polarization of 3.7% + or - 4.1%. This measurement is consistent with inverse Compton models of the optical emission; however, a synchrotron origin cannot be excluded if the small-scale structure of the 3C 273 jet is similar to that of the jet of M87.
Beaver Edward A.
Peterson Bradley. M.
Schmidt Gary D.
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