Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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.

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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph