Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-09-22
MNRAS Letters 2011, 411, pp. L11-L15
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Version accepted for publication in MNRAS Letters. Discussion extended and references added
Scientific paper
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 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.
Aharonian Felix
Crocker Roland M.
Jones David Ian
Law Casey J.
Melia Fulvio
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