Jiang, Bo-WeiBo-WeiJiangMARZIANI, PaolaPaolaMARZIANISavić, ĐorđeĐorđeSavićShablovinskaya, ElenaElenaShablovinskayaPopović, Luka Č.Luka Č.PopovićAfanasiev, Victor L.Victor L.AfanasievCzerny, BożenaBożenaCzernyWang, Jian-MinJian-MinWangdel Olmo, AscensiónAscensióndel OlmoD'ONOFRIO, MAUROMAUROD'ONOFRIOŚniegowska, MarzenaMarzenaŚniegowskaMAZZEI, PaolaPaolaMAZZEIPanda, SwayamtruptaSwayamtruptaPanda2022-06-072022-06-0720210035-8711http://hdl.handle.net/20.500.12386/32234The quasar main sequence 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 β and H α 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. However, we suggest that the polarization properties appear to be more consistent with a warped disc geometry induced by Lense-Thirring precession.STAMPAen10.1093/mnras/stab2273https://academic.oup.com/mnras/article/508/1/79/6343037?login=true2021MNRAS.508...79JFIS/05 - ASTRONOMIA E ASTROFISICA