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Full-Text Articles in Physics
Evidence For A Weak Galactic Center Magnetic Field From Diffuse Low Frequency Nonthermal Radio Emission, Ted N. Larosa, C. L. Brogan, S. N. Shore, T. J. Lazio, N. E. Kassim, M. E. Nord
Evidence For A Weak Galactic Center Magnetic Field From Diffuse Low Frequency Nonthermal Radio Emission, Ted N. Larosa, C. L. Brogan, S. N. Shore, T. J. Lazio, N. E. Kassim, M. E. Nord
Faculty and Research Publications
New low-frequency 74 and 330 MHz observations of the Galactic center (GC) region reveal the presence of a large-scale (6° × 2°) diffuse source of nonthermal synchrotron emission. A minimum-energy analysis of this emission yields a total energy of ~(4/7f3/7) × 1052 ergs and a magnetic field strength of ~6(/f)2/7 μG (where is the proton to electron energy ratio and f is the filling factor of the synchrotron emitting gas). The equipartition particle energy density is 1.2(/f)2/7 eV cm-3, a value consistent with cosmic-ray data. However, the derived magnetic field is several orders of …