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Faraday rotation in the M87 radio/X-ray haloComparison 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.
Document ID
19800047739
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dennison, B. (Virginia Polytechnic Institute and State University Blacksburg, Va., United States)
Date Acquired
August 10, 2013
Publication Date
March 15, 1980
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS8-33359
Distribution Limits
Public
Copyright
Other