Double-double radio galaxies from the FIRST survey
  The radio structures and optical identifications of a sample of 242 sources
classified as double-double radio sources by Proctor (2011) from a
morphological study of sources in the FIRST (Faint Images of the Radio Sky at
Twenty centimeters) survey (2003 April release, 811,117 entries) have been
examined. We have been able to confirm only 23 of these as likely to be
double-double radio galaxies (DDRGs), whose structures could be attributed to
episodic nuclear activity in their host galaxies. A further 63 require either
higher-resolution radio observations or optical identifications to determine
whether these are DDRGs. The remaining sources are unlikely to be DDRGs. We
have examined the luminosities, sizes and symmetry parameters of the DDRGs and
the constraints these place on our understanding of these sources.
