The gamma-ray emission from young radio galaxies and quasars
  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 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
analysed the Fermi-LAT data of each source separately to search for a
significant detection. In addition, we performed 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. In this note we
present the results of our study and we discuss their implications for the
predictions of gamma-ray emission from this class of sources.
