Radio Power from a Direct-Collapse Black Hole in CR7
  The leading contenders for the seeds of the first quasars are direct collapse
black holes (DCBHs) formed during catastrophic baryon collapse in
atomically-cooled halos at $z \sim$ 20. The discovery of the Ly$\alpha$ emitter
CR7 at $z =$ 6.6 was initially held to be the first detection of a DCBH,
although this interpretation has since been challenged on the grounds of
Spitzer IRAC and Very Large Telescope X-Shooter data. Here we determine if
radio flux from a DCBH in CR7 could be detected and discriminated from
competing sources of radio emission in the halo such as young supernovae and H
II regions. We find that a DCBH would emit a flux of 10 - 200 nJy at 1.0 GHz,
far greater than the sub-nJy signal expected for young supernovae but on par
with continuum emission from star-forming regions. However, radio emission from
a DCBH in CR7 could be distinguished from free-free emission from H II regions
by its spectral evolution with frequency and could be detected by the Square
Kilometer Array in the coming decade.
