SIMBAD references

2011MNRAS.416.1152J - Mon. Not. R. Astron. Soc., 416, 1152-1162 (2011/September-2)

Connecting synchrotron, cosmic rays and magnetic fields in the plane of the galaxy.

JAFFE T.R., BANDAY A.J., LEAHY J.P., LEACH S. and STRONG A.W.

Abstract (from CDS):

We extend previous work modelling the Galactic magnetic field in the plane using synchrotron emission in total and polarized intensity. In this work, we include a more realistic treatment of the cosmic ray electrons using the GALPROP propagation code optimized to match the existing high-energy data. This addition reduces the degeneracies in our previous analysis and when combined with an additional observed synchrotron frequency allows us to study the low-energy end of the cosmic ray electron spectrum in a way that has not previously been done. For a pure diffusion propagation, we find a low-energy injection spectrum slightly harder than generally assumed: for J(E) ∝Eα, we find α=-1.34±0.12, implying a very sharp break with the spectrum above a few GeV. This then predicts a synchrotron brightness temperature spectral index, β, on the Galactic plane, that is -2.8 < β < -2.74 below a few GHz and -2.98 < β < -2.91 up to 23 GHz. We find that models including cosmic ray re-acceleration processes appear to be incompatible with the synchrotron data.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): polarization - radiation mechanisms: general - cosmic rays - ISM: magnetic fields - Galaxy: structure - radio continuum: ISM

Status at CDS:  

Simbad objects: 10

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2020.03.31-10:25:06

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