The Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center (GSFC) seeks a creative, innovative individual with strong teamwork and leadership skills to serve as Director of the High Energy Astrophysics Science Archive Research Center (HEASARC). This will be a permanent civil servant position. + Learn more.
sresc: synchrotron spectrum, cut off by particle escape
The synchrotron spectrum from an electron distribution limited by
particle escape above some energy. The electrons are shock-accelerated
in a Sedov blast wave encountering a constant-density medium
containing a uniform magnetic field. The model includes variations in
electron acceleration efficiency with shock obliquity, and post-shock
radiative and adiabatic losses, as described in Reynolds (1998). This is a highly specific, detailed model for a fairly
narrow set of conditions. See also Reynolds
(1996). Note
that the radio spectral index and flux can be obtained from Green's Catalogue for galactic SNRS.
par1 |
alpha: radio spectral index (flux proportional to frequency
f |
par2 |
break Hz: approximately the frequency at which the flux has
dropped by a factor of 6 below a straight power law extrapolation from
radio frequencies. This frequency is 5.3 times the peak frequency
radiated by electrons with energy in a magnetic field of
, in the notation of Reynolds (1998), Eq. (19). |
norm |
1 GHz flux (Jy) |
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Last modified: Friday, 23-Aug-2024 13:20:40 EDT
The Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center (GSFC) seeks a creative, innovative individual with strong teamwork and leadership skills to serve as Director of the High Energy Astrophysics Science Archive Research Center (HEASARC). This will be a permanent civil servant position. + Learn more.
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