Detecting Direct Collapse Black Holes: making the case for CR7
  We propose that one of the sources in the recently detected system CR7 by
Sobral et al. (2015) through spectro-photometric measurements at $z = 6.6$
harbors a direct collapse blackhole (DCBH). We argue that the LW radiation
field required for direct collapse in source A is provided by sources B and C.
By tracing the LW production history and star formation rate over cosmic time
for the halo hosting CR7 in a $\Lambda$CDM universe, we demonstrate that a DCBH
could have formed at $z\sim 20$. The spectrum of source A is well fit by
nebular emission from primordial gas around a BH with MBH $\sim 4.4 \times 10^6
\ \rm M_{\odot}$ accreting at a 40 % of the Eddington rate, which strongly
supports our interpretation of the data. Combining these lines of evidence, we
argue that CR7 might well be the first DCBH candidate.
