Spectroscopic properties of radio-loud and radio-quiet quasars
  Surveys have shown radio-loud (RL) quasars constitute 10%-15% of the total
quasar population and rest are radio-quiet (RQ). However, it is unknown if this
radio-loud fraction (RLF) remains consistent among different parameter spaces.
This study shows that RLF increases for increasing full width half maximum
(FWHM) velocity of the H$\beta$ broad emission line (z < 0.75). To analyse the
reason, we compared bolometric luminosity of RL and RQ quasars sample which
have FWHM of H$\beta$ broad emission line greater than 15000km/s (High Broad
Line or HBL) with which have FWHM of H$\beta$ emission line less than 2500km/s
(Low Broad Line or LBL). From the distributions we can conclude for the HBL, RQ
and RL quasars are peaking separately and RL quasars are having higher values
whereas for the LBL the peaks are almost indistinguishable. We predicted
selection effects could be the possible reason but to conclude anything more
analysis is needed. Then we compared our result with Wills & Browne (1986) and
have shown that some objects from our sample do not follow the pattern of the
logR vs FWHM plot where R is the ratio of 5 GHz radio core flux density with
the extended radio lobe flux density.
