Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Structure of the Local Interstellar Medium IV: Dynamics, Morphology,
  Physical Properties, and Implications of Cloud-Cloud Interactions   We present an empirical dynamical model of the local interstellar medium
based on 270 radial-velocity measurements for 157 sight lines toward nearby
stars. Physical-parameter measurements (i.e., temperature, turbulent velocity,
depletions) are available for 90 components, or one-third of the sample,
enabling initial characterizations of the physical properties of LISM clouds.
The model includes 15 warm clouds located within 15 pc of the Sun, each with a
different velocity vector. We derive projected morphologies of all clouds and
estimate the volume filling factor of warm partially ionized material in the
LISM to be between ~5.5% and 19%. Relative velocities of potentially
interacting clouds are often supersonic, consistent with heating, turbulent,
and metal-depletion properties. Cloud-cloud collisions may be responsible for
the filamentary morphologies found in ~1/3 of LISM clouds, the distribution of
clouds along the boundaries of the two nearest clouds (LIC and G), the detailed
shape and heating of the Mic Cloud, the location of nearby radio scintillation
screens, and the location of a LISM cold cloud. Contrary to previous claims,
the Sun appears to be located in the transition zone between the LIC and G
Clouds.

14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con