We present a study of a sample of 223 radio loud quasars ( up to redshift < 0.3 ) in order to investigate their spectral properties .
Twenty-six of these radio loud quasars are identified as Flat Spectrum Radio Quasars ( FSRQs ) and fifty-four are identified as Steep Spectrum Radio Quasars ( SSRQs ) based on their radio spectral index .
We study the [ O III ] line properties of these quasars to investigate the origin and properties of blue wings ( shift of the profile towards lower wavelengths ) and blue outliers ( shift of the whole spectroscopic feature ) .
Most of the quasars show blue wings with velocities up to 420 km s ^ { -1 } .
We find that around 17 % of the quasars show outliers with velocities spanning 419 to -315 km s ^ { -1 } .
Finally , we revisit the \it M _ { BH } - \sigma relation of our sample using [ S II ] \lambda 6716 , 6731 and [ O III ] linewidths as surrogates for stellar velocity dispersions , \sigma , to investigate their location on the \it M _ { BH } - \sigma relation for quiescent galaxies .
Due to strong blending of [ S II ] with H _ { \alpha } , we could estimate \sigma _ { [ SII ] } of only 123 quasars .
We find that the radio-loud quasars do not show a relationship between \it M _ { BH } and \sigma _ { [ SII ] / [ OIII ] } up to a redshift of 0.3 , although they cluster around the local relation .
We find an overall offset of 0.12 \pm 0.05 dex of our sample of radio loud quasars from the \it M _ { BH } - \sigma relation of quiescent galaxies .
Quasars in our highest redshift bin ( z=0.25-0.3 ) show a deviation of \sim 0.33 \pm 0.06 dex with respect to the local relation .