Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Magnificent Seven in the dusty prairie -- The role of interstellar
  absorption on the observed neutron star population   The Magnificent Seven have all been discovered by their exceptional soft
X-ray spectra and high ratios of X-ray to optical flux. They all are considered
to be nearby sources. Searching for similar neutron stars with larger
distances, one expects larger interstellar absorption resulting in harder X-ray
counterparts. Current interstellar absorption treatment depends on chosen
abundances and scattering cross-sections of the elements as well as on the 3D
distribution of the interstellar medium. After a discussion of these factors we
use the comprehensive 3D measurements of the Local Bubble by Lallement et al.
2003 to construct two simple models of the 3D distribution of the hydrogen
column density. We test these models by using a set of soft X-ray sources with
known distances. Finally, we discuss possible applications for distance
estimations and population synthesis studies.

14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an