Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monte Carlo Simulations of Thermal Comptonization Process in a Two
  Component Advective Flow around a Neutron Star   We explore spectral properties of a Two-Component Advective Flow (TCAF)
around a neutron star. We compute the effects of thermal Comptonization of soft
photons emitted from a Keplerian disc and the boundary layer of the neutron
star by the post-shock region of a sub-Keplerian flow, formed due to the
centrifugal barrier. The shock location $X_s$ is also the inner edge of the
Keplerian disc. We compute a series of realistic spectra assuming a set of
electron temperatures of the post-shock region $T_{CE}$, the temperature of the
normal boundary layer (NBOL) $T_{NS}$ of the neutron star and the shock
location $X_s$. These parameters depend on the disc and halo accretion rates
($\dot{m_d}$ and $\dot{m_h}$, respectively) which control the resultant
spectra. We find that the spectrum becomes harder when $\dot{m}_h$ is
increased. The spectrum is controlled strongly by $T_{NS}$ due to its proximity
to the Comptonizing cloud since photons emitted from the NBOL cool down the
post-shock region very effectively. We also show the evidence of spectral
hardening as the inclination angle of the disc is increased.

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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph