Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..785h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 3, pp. 785-789.
Astronomy and Astrophysics
Astronomy
9
Magnetic Fields, Radiation Mechanisms: Nonthermal, Galaxies: Individual: 0917+75, Galaxies: Magnetic Fields, Radio Continuum: Galaxies, X-Rays: Galaxies
Scientific paper
We have observed the relic radio galaxy, 0917+75, for 15 ks with the Position Sensitive Proportional Counter (PSPC) of the ROSAT X-ray satellite. Although the source was not detected, our upper limit for the X-ray flux enables us to estimate a lower limit to the average magnetic field strength in the source of ~=1 muG (0.1 nT). If the minimum energy condition holds for relativistic particles and magnetic field, and if the inferred power law of relativistic electrons extends a factor of 3 below the energy responsible for the observed 20-MHz emission, then we demonstrate that the energy density in relativistic electrons which produces the observed radio emission must be augmented with a substantial contribution from lower energy electrons or relativistic protons.
Batty J.
Dewdney Peter E.
Harris Daniel E.
Willis George A.
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