A LOFAR view on the duty cycle of young radio sources
  Compact Steep Spectrum, Gigahertz Peaked Spectrum and High Frequency Peak
(CSS, GPS, HFP) sources are considered to be young radio sources but the
details of their duty cycle are not well understood. In some cases they are
thought to develop in large radio galaxies, while in other cases their jets may
experience intermittent activity or die prematurely and remain confined within
the host galaxy. By studying in a systematic way the presence and the
properties of any extended emission surrounding these compact sources we can
provide firmer constraints on their evolutionary history and on the timescales
of activity of the radio source. Remnant emission from previous outbursts is
supposed to have very low surface brightness and to be brighter at low
frequency. Taking advantage of the unprecedented sensitivity and resolution
provided by the Low Frequency Array (LOFAR) we have started a systematic search
of new CSS, GPS and HFP sources with extended emission, as well as a more
detailed study of some well-known of these sources. Here we present the key
points of our search in the LOFAR fields and a more in-depth analysis on the
source B2 0258+35, a CSS source surrounded by a pair of large, diffuse radio
lobes.
