Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A changing-look AGN to be probed by X-ray polarimetry   Active galactic nuclei (AGN) produce the highest intrinsic luminosities in
the Universe from within a compact region. The central engine is thought to be
powered by accretion onto a supermassive black hole. A fraction of this huge
release of energy influences the evolution of the host galaxy, and in
particular, star formation. Thus, AGN are key astronomical sources not only
because they play an important role in the evolution of the Universe, but also
because they constitute a laboratory for extreme physics. However, these
objects are under the resolution limit of current telescopes. Polarimetry is a
unique technique capable of providing us with information on physical AGN
structures. The incoming new era of X-ray polarimetry will give us the
opportunity to explore the geometry and physical processes taking place in the
innermost regions of the accretion disc. Here we exploit this future powerful
tool in the particular case of changing-look AGN, which are key for
understanding the complexity of AGN physics.

28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio