26-30 June 2023
Centro Congressi Federico II
Europe/Rome timezone

Fantastic fits of AGN spectra with FANTASY: case-study of SDSS-RM spectra

30 Jun 2023, 16:15
Aula Magna (Centro Congressi Federico II)

Aula Magna

Centro Congressi Federico II

Via Partenope, 36, Napoli, Italy
Contributed talk Methods and techniques


Prof. Dragana Ilic (University of Belgrade)


We present a new tool FANTASY (Fully Automated pythoN Tool for Agn Spectral analYsis) for multicomponent fitting of active galactic nuclei (AGN) spectra in the optical and near infrared wavelength band. Spectra are modeled by simultaneously fitting the underlying broken power-law continuum, predefined emission line (narrow, broad, coronal, etc.) lists, and an Fe II model, which is here extended to cover the wavelength range from 3700 to 11000A. The Fe II model, founded solely on atomic data, effectively describes the strong emission of the complex iron ion in the vicinity of the H$\gamma$ and H$\beta$ lines, but also near the H$\alpha$ line.
Here we present a case study of the application of FANTASY code on SDSS-RM spectra with S/N>20, with the aim to study the variability properties of Balmer lines, as well as of Fe II emission. One interesting finding is that when Fe II emission is present near Hbeta, it is also detected redward from H$\alpha$, potentially contaminating the broad H$\alpha$ line wings. We show that the FANTASY code is well optimised for bulk fitting of AGN type 1 spectra from SDSS, as it is flexible and easy to use, thus showing great potential for AGN spectral analysis in the coming spectral surveys.

Primary authors

Prof. Dragana Ilic (University of Belgrade) Dr. Nemanja Rakic (University of Banja Luka) Dr. Luka Popović (Astronomical Observatory, Volgina 7, 11000 Belgrade, Serbia, Department of Astronomy, Faculty of Mathematics, University of Belgrade, PIFI Research Fellow, Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences)

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