UV Quasar Main Sequence


Mary Loli


Astronomy Department, Universidad de Concepción, Chile

October 18, 2023 12:30 PM

The spectroscopic properties of type 1 Active Galactic Nuclei (Quasars and Seyfer 1 galaxies) are well organized in the optical Eigenvector 1 sequence (EV1), where the velocity field of the gas surrounding the supermassive black hole (expressed as the Full Width and Half Maximum, FWHM of Hβ) shows a non-linear correlation with the ionization degree of the gas (expressed as the flux ratio of the emission lines Hβ and FeII, known as RFeII). Following the behavior found in the optical EV1 sequence, and using the UV emission lines AlIII1980 and UV FeIII in a sample of ∼ 500 objects from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM), we found a UV Eigenvector 1 sequence, where the Eddington ratio seems to be the main driver of the spectral behavior. This result confirms the existence of a quasar main sequence in broadband and allows us to easily identify AGN subpopulations and the difference in their physical properties.

This is a hybrid event:

Room D, the Institute of Physics PAS, Al. Lotników 32/46

Online: Zoom Link, (Passcode: 134595, Meeting ID: 823 8038 0442)