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Prof. Claudio Ricci (University of Geneva)15/06/2026, 10:15Talk
X-ray-emitting plasma is a ubiquitous feature of accreting massive black holes, but several of its properties and the mechanisms that power it remain unknown. In my talk, I will give an overview of recent findings on the properties of X-ray coronae and how they change with the Eddington ratio, including results from large studies of extremely variable AGN. I will also review recent millimeter...
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Susanna Bisogni (INAF-IASF Milano)15/06/2026, 10:45Talk
Unobscured, radio-quiet quasars define a tight correlation between X-ray and UV luminosities (the Lx-Luv relation), widely interpreted as the signature of disc-corona coupling. However, the physical origin of the scatter around the relation remains unclear, with X-ray-weak quasars representing its most extreme deviations. We assemble a statistically robust sample of more than 5000 quasars with...
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Luca Zappacosta (Istituto Nazionale di Astrofisica (INAF))15/06/2026, 11:30Talk
Shedding light on the nuclear properties of $z>6$ quasars (QSOs) powered by supermassive black holes (SMBHs) with masses $>10^9~M_\odot$ is fundamental to understand their rapid formation during the Epoch of Reionization (EoR). Probing the innermost regions of these QSOs via X-ray emission, at just a few tens of gravitational radii, provides the most direct window into the growing SMBH.
We...
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Alessia Tortosa (INAF - OAR)15/06/2026, 11:50Talk
Understanding how supermassive black holes (SMBHs) rapidly grew in the early Universe is a central question in extragalactic astrophysics. I will present X-ray studies of extreme accretion onto SMBHs across cosmic history, combining results from local super-Eddington accreting AGN and hyper-luminous quasars at z > 6. Local super-Eddington systems show steep X-ray continua, extremely low...
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Valentina Braito (Istituto Nazionale di Astrofisica (INAF))15/06/2026, 12:05Talk
Observations with the high spectral resolution XRISM Resolve detector are transforming our understanding our of AGN winds. Here I will present the results a 150 ksec observation of NGC4051, which caught the AGN in a historically bright state. NGC4051 is a bright nearby Narrow Line Seyfert 1, renowned for its rapid X-ray variability and the presence of a multi-phase wind, detected in both the...
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Prof. Francesco Tombesi (Tor Vergata University of Rome & INAF)15/06/2026, 12:20Talk
Ultra-fast outflows (UFOs) from accreting supermassive black holes provide a direct probe of the coupling between inflowing matter and powerful winds emerging from the inner accretion flow. These relativistic disk winds are now recognized as a key ingredient linking black hole accretion physics to feedback on galactic environments. Recent high-resolution spectroscopy with XRISM/Resolve reveals...
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Scott Hagen (Istituto Nazionale di Astrofisica (INAF))15/06/2026, 12:35Talk
XRISM has provided an unprecedented view of the emission and absorption lines in the X-ray. Notably, early results showed significant complexity to the Fe-Kalpha line profile in AGN, with clear contributions from at least three emitting structures: an inner disc, intermediary broad line region (BLR), and an outer torus. This poses a new challenge for the modelling of the emission lines, which...
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Alfredo Luminari (Istituto Nazionale di Astrofisica (INAF))15/06/2026, 12:50Talk
In this talk, I'll present a new application of the Time-Evolving PhotoIonisation Device (TEPID) code to a time-resolved NuSTAR+XMM-Newton spectrum of NGC 4051 from 2018. This nearby Seyfert I AGN is an ideal laboratory of the innermost accretion scale thanks to its brightness and wealth of spectroscopic features, from the optical to the X-rays. It hosts three disk winds with increasing...
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Ms Laura Borrelli15/06/2026, 14:30Talk
Ultra-fast outflows are highly ionized thick winds with characteristic absorption features (FeXXV and FeXXVI at 6.67-6.97 keV rest-frame) in the hard X-ray band, strongly blue-shifted by the extreme outflow velocities. These quasi-relativistic winds are thought to be the most promising mechanism powering AGN feedback, influencing the SMBH/host galaxy co-evolution. Assessing the relation...
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150. Beyond the dust: probing AGN-driven molecular outflows and phase-dependent extinction in ULIRGsGiovanna Speranza (Instituto de física fundamental (IFF, CSIC))15/06/2026, 14:45Talk
Understanding the structure and physical conditions of the active galactic nucleus (AGN) is essential for tracing how AGN interact with their host galaxies. High resolution multi-wavelength observations are required to probe the obscuring region directly, yet heavily dust-enshrouded systems often lack proper tracers. JWST overcomes many of these limitations, providing unprecedented sensitivity...
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Dr Chiara Niccolai (Scuola Superiore Meridionale)15/06/2026, 15:00Talk
The structure and physical properties of accretion discs in quasars remain poorly understood. A primary challenge lies in disentangling the degenerate roles of various physical parameters—such as black hole mass and spin, accretion rate, inclination, and environment—within the observed emission. A powerful method to mitigate these limitations is the analysis of variable quasars through...
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Dr Riccardo Middei (INAF-OAR)15/06/2026, 15:15Talk
Accretion onto supermassive black holes powers the most luminous persistent sources in the Universe: active galactic nuclei (AGN). Their emission is characterized by two distinct spectral components: thermal optical/ultraviolet radiation from an optically thick accretion disk and a power-law X-ray tail from a corona located in the innermost regions. Despite their prominence, how radiatively...
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Daniele Tagliacozzo (Università degli Studi Roma Tre)15/06/2026, 15:30Talk
The Imaging X-Ray Polarimetry Explorer (IXPE) is providing key measurements of the polarization of Radio-Quiet, unobscured AGN. In these sources the IXPE band (2–8 keV) is typically dominated by Comptonized emission from the corona, a cloud of relativistic electrons, whose shape and origin are debated, that up-scatters optical/UV photons from the accretion disk into X-rays. Because spectral...
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