Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A flat spectrum candidate for a track-type high energy neutrino emission
  event, the case of blazar PKS 0723-008   By cross-correlating both the Parkes Catalogue and the Second Planck
Catalogue of Compact Sources with the arrival direction of the track-type
neutrinos detected by the IceCube Neutrino Observatory, we find the
flat-spectrum blazar PKS 0723-008 as a good candidate for the high-energy
neutrino event 5 (ID5). Apart from its coordinates matching those of ID5, PKS
0723-008 exhibits further interesting radio properties. Its spectrum is flat up
to high Planck frequencies, and it produced a fivefold-increased radio flux
density through the last decade. Based upon these radio properties we propose a
scenario of binary black hole evolution leading to the observed high-energy
neutrino emission. The main contributing events are the spin-flip of the
dominant black hole, the formation of a new jet with significant particle
acceleration and interaction with the surrounding material, with the
corresponding increased radio flux. Doppler boosting from the underlying jet
pointing to the Earth makes it possible to identify the origin of the
neutrinos, so the merger itself is the form of an extended flat-spectrum radio
emission, a key selection criterion to find traces of this complex process.

22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an