Gamma-ray emission from young radio galaxies and quasars: the flaring
  episode of the peculiar galaxy PKS B1413+135
  According to radiative models, radio galaxies are predicted to produce gamma
rays from the earliest stages of their evolution onwards.The study of the
high-energy emission from young radio sources is crucial for providing
information on the most energetic processes associated with these sources, the
actual region responsible for this emission, as well as the structure of the
newly born radio jets. Despite systematic searches for young radio sources at
gamma-ray energies, only a handful of detections have been reported so far.
Taking advantage of more than 11 years of \textit{Fermi}-LAT data, we
investigate the gamma-ray emission of 162 young radio sources (103 galaxies and
59 quasars), the largest sample of young radio sources used so far for a
gamma-ray study. We analyse the \textit{Fermi}-LAT data of each individual
source separately to search for a significant detection. In addition, we
perform the first stacking analysis of this class of sources in order to
investigate the gamma-ray emission of the young radio sources that are
undetected at high energies. We report the detection of significant gamma-ray
emission from 11 young radio sources, including the discovery of significant
gamma-ray emission from the compact radio galaxy PKS 1007+142. Although the
stacking analysis of below-threshold young radio sources does not result in a
significant detection, it provides stringent upper limits to constrain the
gamma-ray emission from these objects. In this talk we present the results of
our study and we discuss their implications for the predictions of gamma-ray
emission from this class of sources.
