The C-Band All-Sky Survey (C-BASS): Template Fitting of Diffuse Galactic
  Microwave Emission in the Northern Sky
  The C-Band All-Sky Survey (C-BASS) has observed the Galaxy at 4.76GHz with an
angular resolution of $0.73^\circ$ full-width half-maximum, and detected
Galactic synchrotron emission with high signal-to-noise ratio over the entire
northern sky ($\delta > -15^{\circ}$). We present the results of a spatial
correlation analysis of Galactic foregrounds at mid-to-high ($b > 10^\circ$)
Galactic latitudes using a preliminary version of the C-BASS intensity map. We
jointly fit for synchrotron, dust, and free-free components between $20$ and
$1000$GHz and look for differences in the Galactic synchrotron spectrum, and
the emissivity of anomalous microwave emission (AME) when using either the
C-BASS map or the 408MHz all-sky map to trace synchrotron emission. We find
marginal evidence for a steepening ($\left<\Delta\beta\right> = -0.06\pm0.02$)
of the Galactic synchrotron spectrum at high frequencies resulting in a mean
spectral index of $\left<\beta\right> = -3.10\pm0.02$ over $4.76-22.8$GHz.
Further, we find that the synchrotron emission can be well modelled by a single
power-law up to a few tens of GHz. Due to this, we find that the AME emissivity
is not sensitive to changing the synchrotron tracer from the 408MHz map to the
4.76GHz map. We interpret this as strong evidence for the origin of AME being
spinning dust emission.
