The radio continuum halo of M 87

Details The radio continuum halo of M 87 The radio continuum halo of M 87

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....74...93a&link_type=abstract

Astronomy and Astrophysics, vol. 74, no. 1, Apr. 1979, p. 93-99.

Astronomy and Astrophysics

Astrophysics

38

Elliptical Galaxies, Halos, Radio Galaxies, Radio Spectroscopy, Synchrotron Radiation, Virgo Galactic Cluster, Astronomical Spectroscopy, Linear Polarization, Polarization Characteristics, Superhigh Frequencies

Scientific paper

Results are reported for 2.7-, 4.8-, and 10.7-GHz observations of the large radio halo surrounding the elliptical galaxy M87. It is shown that the spectral index of the radio halo continues to steepen up to 10.7 GHz, implying a deficiency of high-energy electrons in the halo. A relatively smooth circumferential magnetic field is found to permeate the section of the radio halo from which the polarized flux originates. A halo electron density is derived which is considerably less than the value required to account for the extended X-ray emission.

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