Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determining the Distance of Cyg X-3 with its X-ray Dust Scattering Halo   Using a cross-correlation method, we study the X-ray halo of Cyg X-3. Two
components of dust distributions are needed to explain the time lags derived by
the cross-correlation method. Assuming the distance as 1.7 kpc for Cygnus OB2
association (a richest OB association in the local Galaxy) and another uniform
dust distribution, we get a distance of $7.2^{+0.3}_{-0.5}$ kpc (68$%$
confidence level) for Cyg X-3. When using the distance estimation of Cygnus OB2
as 1.38 kpc or 1.82 kpc, the inferred distance for Cyg X-3 is
$3.4^{+0.2}_{-0.2}$ kpc or $9.3^{+0.6}_{-0.4}$ kpc respectively. The distance
estimation uncertainty of Cyg X-3 is mainly related to the distance of the
Cygnus OB2, which may be improved in the future with high precision astrometric
measurements. The advantage of this method is that the result depends weakly on
the photon energy, dust grain radius, scattering cross-section and so on.

31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph