Physics
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...310l...5r&link_type=abstract
Astronomy and Astrophysics, v.310, p.L5-L8
Physics
31
Acceleration Of Particles, Black Hole Physics, Radiation Mechanisms: Non-Thermal, Galaxies: Individual: Ngc 3031, Galaxies: Nuclei, Radio Continuum: Galaxies
Scientific paper
Radio continuum observations at short mm-wavelengths (λλ3.4, 2.2 and 1.2mm) of the nucleus of NGC3031 (M81) allow a final determination of the radio spectrum from the meter to the short mm-range. The spectrum is found to be interpreted up to 100GHz and is well fitted by a Snu_~ν^1/3^exp(-ν/ν_c_) law with a break frequency ν_c_=200HGHz. The radio spectrum is discussed in terms of two homogeneous and inhomogeneous synchrotron self-absorption models, however, each of these models requires quite unlikely physical parameters in order to be self-consistent. As an alternative scenario, we present a model of optically thin synchrotron emission of a quasi-monoenergetic distribution of relativistic electrons which, in the ideal case, shows exactly a Snu_~ν^1/3^exp(-ν/ν_c_) behaviour. We find a striking similarity of the M81 spectrum with that of the radio core in the Milky Way (SgrA*) which may lead to the conclusion that the same underlying physical mechanism is responsible for the observed spectra and that the core of M81 is a by a factor of 10000 upscaled version of SgrA*.
Lesch Harald
Reuter H.-P.
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