Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for the Galactic X-ray Bulge II   A mosaic of 5 \ros~PSPC pointed observations in the Galactic plane
($l\sim25^{\circ}$) reveals X-ray shadows in the $0.5-2.0$ keV band cast by
distant molecular clouds. The observed on-cloud and off-cloud X-ray fluxes
indicate that $\sim15$% and $\sim37$% of the diffuse X-ray background in this
direction in the \tq~keV and 1.5 keV bands, respectively, originates behind the
molecular gas which is located at $\sim$3 kpc from the Sun. The implication of
the derived background X-ray flux beyond the absorbing molecular cloud is
consistent with, and lends further support to recent observations of a Galactic
X-ray bulge.

34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga