Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutron star black hole binaries in LIGO/Virgo O3b run were formed from
  Population I/II binaries   Two neutron star (NS) black hole (BH) binaries, GW200105 and GW200115 found
in the LIGO/Virgo O3b run have smaller BH mass of $6-9$$M_{\odot}$ which is
consistent with Population I and II origin. Our population synthesis
simulations using $10^6$ Population I and II binaries with appropriate initial
parameters show consistent binary mass, event rate, and no detection of radio
pulsar (PSR) and BH binaries in our Galaxy so far. Especially, we found
possible progenitors of GW200105 and GW200115 which were formed at redshift
$z=0.15$ and $z=1.6$ with binary mass of $(34M_{\odot},\, 9.2M_{\odot})$ and
$(23.7M_{\odot},\, 10.6M_{\odot})$, respectively. The final masses of these
binaries are $(6.85M_{\odot},\,2.14M_{\odot})$ and
$(6.04M_{\odot},\,1.31M_{\odot})$ which look like
$(9.0_{-1.7}^{+1.7}M_{\odot},\, 1.91_{-0.24}^{+0.33}M_{\odot})$ of GW200105 and
$(5.9_{-2.5}^{+2.0}M_{\odot},\,1.44_{-0.29}^{+0.85}M_{\odot})$ of GW200115,
respectively. We also estimate that $4-20$ PSR-BH binaries in our galaxy will
be observed by SKA. The existence of NS-BH binaries in our galaxy can be
confirmed in future SKA era.

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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org