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Exploring the hardness of the ionizing radiation with the infrared softness diagram - II. Bimodal distributions in both the ionizing continuum slope and the excitation in active galactic nuclei

E. Pérez-Montero, J. A. Fernández-Ontiveros, B. Pérez-Díaz, J. M. Vílchez and R. Amorín

A&A, 696 (2025) A229

Published online: 25 April 2025

DOI: 10.1051/0004-6361/202453276

E. Pérez-Montero

J. A. Fernández-Ontiveros

B. Pérez-Díaz

J. M. Vílchez

R. Amorín

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