SAGAN -- III: New insights into giant radio quasars
  Giant radio quasars (GRQs) are radio-loud active galactic nuclei (AGNs),
propelling megaparsec-scale jets. In order to understand GRQs and their
properties, we have compiled all known GRQs ("the GRQ catalogue"), and a subset
of small (size <700 kpc) radio quasars (SRQs) from the literature. In this
process, we have found 10 new FR-II GRQs, in the redshift range of 0.66 < z <
1.72, which we include in the GRQ catalogue. Using the above samples, we have
carried out a systematic comparative study of GRQs and SRQs, using optical and
radio data. Our results show that the GRQs and SRQs statistically have similar
spectral index and black hole mass distributions. However, SRQs have higher
radio core power, core dominance factor, total radio power, jet kinetic power
and Eddington ratio compared to GRQs. On the other hand, when compared to giant
radio galaxies (GRGs), GRQs have higher black hole mass and Eddington ratio.
The high core dominance factor of SRQs is an indicator of them lying closer to
the line of sight than GRQs. We also find a correlation of the accretion disc
luminosity with the radio core and jet power of GRQs, which provides evidence
for disc-jet coupling. Lastly, we find the distributions of Eddington ratios of
GRGs and GRQs to be bi-modal, similar to that found in small radio galaxies
(SRGs) and SRQs, which indicate that size is not strongly dependent on the
accretion state. Using all of these, we provide a basic model for the growth of
SRQs to GRQs.
