Faraday rotation in the M87 radio/X-ray halo

Details Faraday rotation in the M87 radio/X-ray halo Faraday rotation in the M87 radio/X-ray halo

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..761d&link_type=abstract

Astrophysical Journal, Part 1, vol. 236, Mar. 15, 1980, p. 761-768.

Astronomy and Astrophysics

Astronomy

27

Elliptical Galaxies, Faraday Effect, Galactic Structure, Halos, Interstellar Magnetic Fields, Radio Sources (Astronomy), X Ray Sources, Compton Effect, Gas Heating, Ionized Gases, Polarization (Waves), Radio Galaxies, Relativistic Particles

Scientific paper

Comparison of polarization maps at various wavelengths demonstrates the existence of a large Faraday rotation uniform over the radio core of M87. Much of this rotation must be external to the core, lest it appear completely depolarized when the rotation is about 90 degrees. The Faraday rotation is shown to occur primarily in the surrounding radio/X-ray halo. Using the electron density inferred from X-ray observations, the magnetic field in the halo is found to be 2.5 microgauss. The deduced magnetic field strength permits an evaluation of the importance of Compton scattering of 3 K background photons by relativistic electrons in the radio halo. The emergent Compton-scattered spectrum is calculated, and its contribution to the observed X-ray flux is small, probably about a percent or so, while the rest is due to thermal bremsstrahlung.

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