Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Milky Way Hot Baryons and their Peculiar Density Distribution: a
  Relic of Nuclear Activity   We know that our Galaxy is permeated by tenuous, hot, metal-rich gas. However
much remains unknown about its origin, the portion of the Galaxy that it
permeates, its total mass, as any role it may play in regulating activity in
the Galaxy. In a Letter currently in the press with the ApJ, we show that this
hot gas permeates both the disk of the Galaxy and a large spherical volume,
centered on the Galactic nucleus, and extending out to distances of at least
60-200 kpc from the center. This gas displays a peculiar density distribution
that peaks about 6 kpc from the Galaxy's center, likely witnessing a period of
strong activity of the central super-massive black hole of the Milky Way that
occurred 6 Myrs ago. With our study we are also able to update the total
baryonic mass of the Galaxy to Mb = (0.8-4)x1e11 Solar Masses, sufficient to
close the Galaxy's baryon census.

1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg