Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The fate of Cyg X-1: an empirical lower limit on BH-NS merger rate   The recent distance determination allowed precise estimation of the orbital
parameters of Cyg X-1, which contains a massive 14.8 Msun BH with a 19.2 Msun O
star companion. This system appears to be the clearest example of a potential
progenitor of a BH-NS system. We follow the future evolution of Cyg X-1, and
show that it will soon encounter a Roche lobe overflow episode, followed
shortly by a Type Ib/c supernova and the formation of a NS. It is demonstrated
that in majority of cases (70%) the supernova and associated natal kick
disrupts the binary due to the fact that the orbit expanded significantly in
the Roche lobe overflow episode. In the reminder of cases (30%) the newly
formed BH-NS system is too wide to coalesce in the Hubble time. Only
sporadically (1%) a Cyg X-1 like binary may form a coalescing BH-NS system
given a favorable direction and magnitude of the natal kick. If Cyg X-1 like
channel (comparable mass BH-O star bright X-ray binary) is the only or dominant
way to form BH-NS binaries in the Galaxy we can estimate the empirical BH-NS
merger rate in the Galaxy at the level of 0.001 per Myr. This rate is so low
that the detection of BH-NS systems in gravitational radiation is highly
unlikely, generating Advanced LIGO/VIRGO detection rates at the level of only 1
per century. If BH-NS inspirals are in fact detected, it will indicate that the
formation of these systems proceeds via some alternative and yet unobserved
channels.

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The categories of this paper are: cs
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: math
27
The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex