Using FANTASY (Fully Automated pythoN Tool for AGN Spectra analYsis) to Explore the Diversity of Quasar Phenomenology

Abstract

Quasars give us a glimpse into how the physics works in the center of active galactic nuclei (AGN) and its surroundings environment. This research utilizes FANTASY, and open-source Python tool for multi-component AGN spectral fitting in the optical rest-frame (3600-8000 A). We analyze low-redshift (z < 0.85) quasars using high signal-to-noise SDSS spectra, focusing on (1) internal broad emission line shifts. (e.g, Fell, Balmer lines), (2) giant radio quasars (GRQs) with jets > 0.7 Mpc, and (3) quasars with extreme colors. This poster presents progress on spectral modeling and initial findings, with ongoing work aimed at refining emission-line diagnostics and quasar classification.