Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Clues to the Structure of AGN through massive variability surveys   Variability studies hold information on otherwise unresolvable regions in
Active Galactic Nuclei (AGN). Population studies of large samples likewise have
been very productive for our understanding of AGN. These two themes are coming
together in the idea of systematic variability studies of large samples - with
SDSS, PanSTARRS, and soon, LSST. I summarise what we have learned about the
optical and UV variability of AGN, and what it tells us about accretion discs
and the BLR. The most exciting recent results have focused on rare large-scale
outbursts and collapses - Tidal Disruption Events, changing-look AGN, and large
amplitude microlensing. All of these promise to give us new insight into AGN
physics.

0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th