14–24 Jul 2025
CICG - International Conference Centre - Geneva, Switzerland
Europe/Zurich timezone
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One Code to Fit Them All: Forward-Folding AGN Spectra Over 11 Energy Decades with Gammapy

18 Jul 2025, 17:50
15m
CICG - International Conference Centre - Geneva, Switzerland

CICG - International Conference Centre - Geneva, Switzerland

17 rue de Varembé CH - 1211 Geneva Switzerland
Talk Gamma-Ray Astrophysics GA

Speaker

Dr Mireia Nievas Rosillo (IAC, ULL)

Description

Most modern studies of Active Galactic Nuclei (AGN) rely on broadband spectral analyses to constrain the plethora of particle acceleration and emission processes. Traditional analysis methods are often hindered by the use of proprietary tools tailored for each participating instrument, making it challenging to integrate multi-wavelength data in a consistent, reproducible[,,] and statistically correct way.

In this work, we present a unified framework using the open-source tool gammapy to perform a forward-folding spectral analysis of AGN data from the optical to gamma-rays (over 11 decades in energy), enabling the full incorporation of instrument response functions and astrophysical backgrounds, while reducing biases associated with the traditional flux point analysis. It also offers a flexible and compact data format to store and distribute the data and telescope information.

We demonstrate its capabilities with data from the quasars OP 313 and 4C +27.50, which underwent flaring activity during 2024. Our analysis includes optical data from the Liverpool Telescope, UV data from Swift-UVOT, X-ray data from Swift-XRT and NuSTAR, and gamma-ray data from Fermi-LAT. We validate the analysis against native tools for each instrument, and discuss the prospects for future multi-wavelength and time-domain astrophysical studies of AGN.

Author

Dr Mireia Nievas Rosillo (IAC, ULL)

Co-authors

Fabio ACERO (FSLAC IRL 2009, CNRS/IAC, AIM, CEA, CNRS, Université Paris-Saclay) Jorge Otero Santos (INFN, University of Padova) Daniel Morcuende (IAA, CTAO) Regis Terrier (APC, Université de Paris, CNRS, CEA, Observatoire de Paris) Axel Arbet-Engels (Max Planck Institute for Physics) Lea Alina Heckmann (APC Paris (CNRS))

Presentation materials

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