15–19 Sept 2025
Cefalù (Palermo)
Europe/Rome timezone

Changing-state AGN and X-ray binaries

Not scheduled
15m
Palazzo Municipale - Sala delle Capriate (Cefalù (Palermo))

Palazzo Municipale - Sala delle Capriate

Cefalù (Palermo)

Cefalù (Palermo)
Invited talk Invited talk XRBs meet ULX and AGN

Speaker

Prof. Claudio Ricci (University of Geneva)

Description

AGN are known to show flux variability over all observable timescales and across the entire electromagnetic spectrum. Over the past decade, a growing number of sources have been observed to show dramatic flux and spectral changes, both in the X-rays and in the optical/UV. Such events, commonly described as “changing-look AGN”, can be divided into two well-defined classes. Changing-obscuration objects show strong variability of the line-of-sight column density, mostly associated with clouds or outflows eclipsing the central engine of the AGN. Changing-state AGN are instead objects in which the optical/UV continuum emission and broad emission lines appear or disappear, and are typically triggered by strong changes in the accretion rate of the supermassive black hole. In my talk, I will review our current understanding of Changing-State AGN, and then focus on similarities between these objects and X-ray binaries.

Affiliation University of Geneva, Switzerland
E-mail claudio.ricci.astro@gmail.com

Author

Prof. Claudio Ricci (University of Geneva)

Presentation materials

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