Magnetic fields in the centre of the Perseus cluster |
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| Authors: | G B Taylor N E Gugliucci A C Fabian J S Sanders G Gentile S W Allen |
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| Institution: | Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USA;National Radio Astronomy Observatory, Socorro, NM 87801, USA;Department of Astronomy, University of Virginia, Charlottesville, VA 22903, USA;Institute of Astronomy, Madingley Road, Cambridge CB3 0HA;Kavli Institute of Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305, USA |
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| Abstract: | We present Very Long Baseline Array (VLBA) observations of the nucleus of NGC 1275, the central, dominant galaxy in the Perseus cluster of galaxies. These are the first observations to resolve the linearly polarized emission from 3C 84, and from them we determine a Faraday rotation measure (RM) ranging from 6500 to 7500 rad m−2 across the tip of the bright southern jet component. At 22 GHz some polarization is also detected from the central pc of 3C 84, indicating the presence of even more extreme RMs that depolarize the core at lower frequencies. The nature of the Faraday screen is most consistent with being produced by magnetic fields associated with the optical filaments of ionized gas in the Perseus cluster. |
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| Keywords: | accretion accretion discs galaxies: clusters: individual: Perseus intergalactic medium radio continuum: galaxies |
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