Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A study of the scaling relation $M_{\bullet }\propto R_{e}\sigma ^{3}$
  for supermassive black holes and an update of the corresponding theoretical
  model   In this paper we want to compare the theoretical predictions of a law
proposed by Feoli and Mancini, with the most recent experimental data about
galaxies and Supermassive black holes. The physical principle behind this law
is the transformation of the angular momentum of the interstellar material,
which falls into the black hole, into the angular momentum of the radiation
emitted in this process. Despite the simplicity of the model, this law shows an
excellent agreement with the experimental data for early-type galaxies while a
new approach is proposed for spirals.

26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex