Linear Spectropolarimetric Analysis of Fairall 9 with VLT/FORS2
  The quasar Main Sequence (MS) appears to be an incredibly powerful tool to
organize the diversity in large samples of type-1 quasars but the most
important physical parameters governing it are still unclear. Here we
investigate the origin of the broadening and of a defining feature of
Population B sources: a strong redward asymmetry of the Balmer emission lines.
We focus on a prototypical source, Fairall 9. Spectropolarimetric data of the
Fairall 9 broad H$\beta$ and H$\alpha$ profiles allowed for a view of the
geometric and dynamical complexity of the line emitting regions. Measurements
(1) provided evidence of rotational motion; (2) were helpful to test the
presence of polar and equatorial scatterers, and their association with
non-virial motions.
