Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Beads on a String and Spurs in Galactic Disks   The organization of the interstellar medium in disk galaxies obeys the large
scale dynamics set by kpc-size structures. Improving our knowledge of how the
dense, molecular gas is distributed in a disk is an important step in our
understanding of star formation at galactic scale. Using a recently published
simulation of a Milky Way-like galaxy, we explore the formation and dynamical
organization of the star forming gas in a proto-typical disk. Along spiral
arms, we report the formation of regularly spaced clouds, called beads on a
string and spurs. The former form through gravitational instabilities while the
later originate from Kelvin-Helmholtz instabilities. We propose that the
co-existence of both structures in the same galaxy can be explained by a
different role of the disk dynamics, depending on the location within the disk.
In particular, we highlight the impact of the pitch angle of the spiral arm in
the development of either type of structure.

27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th