Journal Article

Magnetic field strengths in the hotspots of 3C 33 and 111

M. J. Hardcastle, M. Birkinshaw and D. M. Worrall

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 294, issue 4, pages 615-621
Published in print March 1998 | ISSN: 0035-8711
Published online March 1998 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-8711.1998.01159.x
Magnetic field strengths in the hotspots of 3C 33 and 111

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Abstract

We report on ROSAT HRI observations of the nearby powerful radio galaxies 3C 33 and 111, which both have detected optical hotspots. We find nuclear X-ray sources in both objects, but no X-ray emission from the hotspots. This confirms the presence of a high-energy cut-off in the spectrum of synchrotron-emitting electrons. Since these electrons necessarily scatter the synchrotron photons by the inverse Compton process, our upper limits on the X-ray fluxes of the hotspots allow us to set lower limits of a few nanotesla on their magnetic flux density, close to or greater than the fields implied by equipartition of energy between radiating particles and magnetic field.

Keywords: magnetic fields; radiation mechanisms: non-thermal; galaxies: individual: 3C 33; galaxies: individual: 3C 111; X-rays: galaxies

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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