Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energetic Particles of Cosmic Accelerators II: Active Galactic Nuclei
  and Gamma-ray Bursts   The high-energy universe has revealed that energetic particles are ubiquitous
in the cosmos and play a vital role in the cultivation of cosmic environments
on all scales. Though they play a key role in cultivating the cosmological
environment and/or enabling our studies of it, there is still much we do not
know about AGNs and GRBs, particularly the avenue in which and through which
they supply radiation and energetic particles, namely their jets. This White
Paper is the second of a two-part series highlighting the most well-known
high-energy cosmic accelerators and contributions that MeV gamma-ray astronomy
will bring to understanding their energetic particle phenomena. The focus of
this white paper is active galactic nuclei and gamma-ray bursts.

23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin