Search Publications

Testing the Anomalous Growth of the Black Hole Radius from AGN

Addazi, Andrea; Marciano, Antonino; Qian, Chenyang

We analyze constraints on the anomalous growth of the black hole radius or the black hole spin from the X-rays spectrum data of Active Galactic Nuclei (AGN) in NGC 5506. The anomalous growth of the mass or of the spin of a black hole may be unveiled within the framework of models of alternative gravity, including f(R)-gravity. Our phenomenological…

A Changing-Look AGN to Be Probed by X-ray Polarimetry

Miniutti, Giovanni; Agís-González, Beatriz; Hutsemékers, Damien

Active galactic nuclei (AGN) produce the highest intrinsic luminosities in the Universe from within a compact region. The central engine is thought to be powered by accretion onto a supermassive black hole. A fraction of this huge release of energy influences the evolution of the host galaxy, and in particular, star formation. Thus, AGN are key as…