Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Massive black hole remnants of the first stars II: optical and X-ray
  signatures in present-day galactic haloes   The first stars forming in minihaloes at redshifts greater than 20 may have
been very massive and could have left behind massive black hole (MBH) remnants.
In a previous paper we investigated the hierarchical merging of these MBHs and
their associated haloes, using a semi-analytical approach consisting of a
hierarchical merger tree algorithm and explicit prescriptions for the dynamics
of merged substructure inside a larger host halo following a merger. One of the
results was the prediction of a number of MBHs orbiting throughout present-day
galactic haloes. In addition we determined the mass accretion rate of these
MBHs assuming that they could in principle remain embedded in a gaseous core
that is a remnant of the haloes with which the MBHs were associated before
merging with the host system. On this basis we determine in this paper the
bolometric, optical and X-ray luminosity functions for the accreting MBHs using
thin disk and advection dominated accretion flow models. Our predicted MBH
X-ray emissions are then compared with observations of ultra-luminous X-ray
sources in galaxies. We find that the slope and normalisation of the predicted
X-ray luminosity function are consistent with the observations.

22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc