γ-rays and the far-infrared-radio continuum correlation reveal a powerful Galactic Centre wind

R. M. Crocker, D. I. Jones, F. Aharonian, C. J. Law, F. Melia, J. Ott
2010 Monthly Notices of the Royal Astronomical Society: Letters  
We consider the thermal and non-thermal emission from the inner 200 pc of the Galaxy. The radiation from this almost star-burst-like region is ultimately driven dominantly by on-going massive star formation. We show that this region's radio continuum (RC) emission is in relative deficit with respect to the expectation afforded by the Far- infrared-Radio Continuum Correlation (FRC). Likewise we show that the region's gamma-ray emission falls short of that expected given its star formation and
more » ... ar formation and resultant supernova rates. These facts are compellingly explained by positing that a powerful (400-1200 km/s) wind is launched from the region. This wind probably plays a number of important roles including advecting positrons into the Galactic bulge thus explaining the observed ~kpc extension of the 511 keV positron annihilation signal around the GC. We also show that the large-scale GC magnetic field falls in the range ~100-300 microG and that - in the time they remain in the region - GC cosmic rays do not penetrate into the region's densest molecular material.
doi:10.1111/j.1745-3933.2010.00983.x fatcat:7ywllbzgibfgxdlnamb7qu463m