Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A search for Centaurus A-like features in the spectra of Fermi-LAT
  detected radio galaxies   Motivated by the detection of a hardening in the gamma-ray spectrum of the
radio galaxy Centaurus A, we have analysed ~10 years of Fermi-LAT observations
of 26 radio galaxies to search for similar spectral features. We find that the
majority of the radio galaxies' gamma-ray spectral energy distributions are
best fitted with a simple power-law model, and no spectral hardening similar to
that found in Centaurus A was detected. We show that, had there been any such
spectral features present in our sample of radio galaxies, they would have been
seen, but note that 7 of the radio galaxies (3C 111, 3C 120, 3C 264, IC 4516,
NGC 1218, NGC 2892 and PKS 0625-35) show evidence for flux variability on
6-month timescales, which makes the detection of any steady spectral features
difficult. We find a strong positive correlation (r = 0.9) between the core
radio power at 5 GHz and the gamma-ray luminosity and, using a simple
extrapolation to TeV energies, we expect around half of the radio galaxies
studied will be detectable with the forthcoming Cherenkov Telescope Array.

35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol