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 Hβ and Hα 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.
@article{arxiv.2108.00983,
title = {Linear Spectropolarimetric Analysis of Fairall 9 with VLT/FORS2},
author = {Bo-Wei Jiang and Paola Marziani and Đorđe Savić and Elena Shablovinskaya and Luka Č. Popović and Victor L. Afanasiev and Bożena Czerny and Jian-Min Wang and Ascensión del Olmo and Mauro D'Onofrio and Marzena Śniegowska and Paola Mazzei and Swayamtrupta Panda},
journal= {arXiv preprint arXiv:2108.00983},
year = {2021}
}
Comments
22 pages, 3 tables and 14 figures. Accepted for publication in MNRAS