Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling Dust Polarization Observations of Molecular Clouds through MHD
  Simulations   The BLASTPol observations of Vela C have provided the most detailed
characterization of the polarization fraction $p$ and dispersion in
polarization angles $S$ for a molecular cloud. We compare the observed
distributions of $p$ and $S$ with those obtained in synthetic observations of
simulations of molecular clouds, assuming homogeneous grain alignment. We find
that the orientation of the mean magnetic field relative to the observer has a
significant effect on the $p$ and $S$ distributions. These distributions for
Vela C are most consistent with synthetic observations where the mean magnetic
field is close to the line-of-sight. Our results point to apparent magnetic
disorder in the Vela C molecular cloud, although it can be due to either an
inclination effect (i.e., observing close to the mean field direction) or
significant field tangling from strong turbulence/low magnetization. The joint
correlations of $p$ with column density and of $S$ with column density for the
synthetic observations generally agree poorly with the Vela C joint
correlations, suggesting that understanding these correlations require a more
sophisticated treatment of grain alignment physics.

24
The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol