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paolo giommi (INAF-Brera Observatory, Milan)14/09/2026, 13:10Invited
In this presentation, I will briefly review my research on blazars, much of which was carried out in collaboration with Paolo Padovani.
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I will then present very recent results on the cosmological properties of blazars based on the largest complete and statistically well-defined sample of X-ray-selected blazars derived from the eRASS1 survey. I will also discuss recent identifications of... -
Luigi Costamante (Independent researcher)14/09/2026, 13:40Invited
In the past two decades tremendous progress has been made in the observation of jetted AGNs, thanks to a new generation of instruments, especially in X-rays and gamma-rays.
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From population studies (going lower in luminosity, further in redshift, broader in SEDs and source types) to new phenomenology (ultra-fast variability, hard TeV spectra, changing-look AGNs, neutrinos association, X-ray... -
Dr David Paneque14/09/2026, 14:10Invited
Active Galactic Nuclei (AGN) serve as some of the universe's most powerful and extreme cosmic accelerators. Over the past several decades, our understanding of these objects has evolved from early taxonomic classifications into a coherent framework driven by broad multi-wavelength surveys. Today, the advent of next-generation instrumentation for high-energy photon and neutrino astronomy is...
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Dr Paolo GOLDONI (APC/IRFU)14/09/2026, 14:40Regular
Blazars represent the most numerous class of High Energy (HE; E about 50 MeV to few 100 GeV) and Very High Energy (VHE; E about 100 GeV to 10 TeV) gamma-ray emitters.
The knowledge of their redshift is fundamental for understanding their emission and conducting population studies. Furthermore, the redshift is essential for indirect studies of the extragalactic background light as well as...
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KRISHNA MOHANA AMMENADKA (Xinjiang Astronomical Observatory (XAO), Chinese Academy of Sciences (CAS), China)14/09/2026, 15:30Regular
We present results from our comprehensive multiwavelength studies of the FSRQ 3C 279 (Krishna Mohana A et al. 2024, MNRAS, 527, 6970; 2025, ApJ, 989, 125) — one of the brightest and most variable blazars in the gamma-ray sky — alongside the first data release of the quasi-Simultaneous Multiwavelength Monitoring of gamma-ray-loud AGNs with the Nanshan 26 m radio telescope (SMMAN; Cui, Krishna...
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SANGEETHA KIZHAKKEKALAM (Janusz Gil Institute of Astronomy, University of Zielona Gora, Poland)14/09/2026, 15:50flash talk
Blazars represent the most extreme subclass of active galactic nuclei, characterized by relativistic jets aligned close to the line of sight and exhibiting strong variability across the electromagnetic spectrum. Their non-thermal emission is dominated by relativistically beamed radiation from the jet, making them ideal laboratories for studying particle acceleration and energy dissipation...
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Ioannis Myserlis (Institut de Radioastronomie Milimétrique (IRAM))14/09/2026, 16:10Regular
Blazars, the subclass of jetted AGN with their outflow axes closely aligned to our line of sight, comprise one of the most energetic, long-lived phenomena in the Universe. They are among the main constituents of the high-energy sky, especially in gamma-rays and up to TeV energies, and one of possible sources of astrophysical neutrinos. The low-energy part of their SEDs is understood as...
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TIANFANG ZHANG (NAOJ)14/09/2026, 16:30Regular
Blazars are highly variable gamma-ray sources whose flaring activity provides a direct probe of particle acceleration and radiation processes in relativistic jets. However, the gamma-ray spectral behavior associated with individual flare peaks has not yet been characterized systematically for a large blazar sample. In this work, we investigate whether blazars become spectrally harder or softer...
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Omar Kurtanidze (Abastumani Observatory)14/09/2026, 16:50flash talk
We present multi-band optical observations of OJ 287 from 2015 to 2025 with a focus on its optical activity on diverse timescales. A total of 2296, 10927, 11484, and 2982 data points are obtained in B, V, R, and I bands, respectively. The densely sampled observations allow us to keep track of the source evolution that it has exhibited since the start of the predicted major optical flaring...
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Stella Boula (INAF-OAB)14/09/2026, 17:10Regular
Relativistic jets from Active Galactic Nuclei are quintessential multi-messenger engines, yet a persistent challenge remains in connecting their macroscopic evolution to the localized kinetic scales responsible for high-energy emission. This work presents high-resolution 2D and 3D relativistic magnetohydrodynamic (RMHD) simulations using the PLUTO code to bridge this gap. We investigate the...
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Gabriel Torralba Paz (Max Planck Institute for Plasma Physics)14/09/2026, 17:30Regular
We demonstrate that magnetized mildly relativistic shocks may be efficient particle accelerators capable of accounting for the intense X-ray and gamma-ray emission observed in jets of active galactic nuclei (AGN).
We employ the particle-in-cell (PIC) method to investigate a mildly relativistic shock in a magnetized electron-ion plasma under two magnetic field configurations: an oblique...
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Roberto Gilli (INAF-OAS Bologna)15/09/2026, 09:00Invited
Recent X-ray spectroscopic and polarimetric observations of nearby Seyfert galaxies are providing new constraints on the physics and geometry of the innermost AGN regions, where hot and dense plasmas are present and powerful outflows are launched. At the same time, in the distant Universe, new AGN populations discovered by JWST are escaping detection in the X-rays, even in the deepest X-ray...
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Stefano Bianchi (Università degli Studi Roma Tre)15/09/2026, 09:30Invited
X-ray polarimetry has opened a new window on the physics of active galactic nuclei, providing direct information on geometry, magnetic fields, scattering regions, and the particle acceleration and emission processes operating in relativistic jets that cannot be obtained from spectroscopy, timing, or imaging alone. In this talk, I will review the emerging observational picture from recent X-ray...
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15/09/2026, 10:00Regular
Reverberation mapping (RM) of Active galactic nuclei is a multi-messenger time domain that provides one of the most direct probes of the geometry and kinematics of the AGN broad-line region. It combines broad-band photometry and emission line spectroscopy to construct light curves to measure time delays between the continuum and line variability, with this lag time acting as a ruler of the...
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Xiurui Zhao (Caltech)15/09/2026, 10:50Regular
The X-ray emission in active galactic nuclei (AGN) is produced in a hot corona, where energetic electrons up-scatter UV/optical photons from the accretion disk into X-rays through inverse Compton scattering. Hard X-ray observations from NuSTAR provide key constraints on the coronal temperature and optical depth, while recent studies have revealed that millimeter (mm) synchrotron emission...
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FRANCESCA PANESSA (IAPS INAF)15/09/2026, 11:10Invited
The origin of radio emission in radio-quiet AGN remains a central debate regarding the nature of accretion and feedback around supermassive black holes. While this emission is often attributed to star formation or diffuse outflows, current evidence increasingly points toward a compact jet base or a magnetized corona tied to the sub-parsec accretion engine. The most definitive diagnostic for...
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LEONARDO PENNA (University of Cagliari, INAF-OAC)15/09/2026, 11:40Regular
The classical Fanaroff-Riley (FR) classification of radio galaxies is primarily based on powerful and extended FRI and FRII sources. However, more sensitive radio and optical surveys have revealed a large population of compact radio galaxies in the local Universe, known as FR0s, which outnumber FRIs by a factor of 5. Despite these populations share many properties, FRIs develop powerful...
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Ingyin Zaw (New York University Abu Dhabi)15/09/2026, 12:00Regular
AGN in the local universe exhibit an inverse correlation between radio-loudness and Eddington ratio. Furthermore, the radio emission in local radio-loud AGN is typically dominated by a large scale jet. I will present the results of a very long baseline interferometry study of eROSITA Final Equatorial Depth Survey J084222.9+001000, a super-Eddington ($\lambda_{\rm Edd, UV}$ = 1.4 and...
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Dr Andrea Tramacere (Université de Genève)15/09/2026, 14:20Invited
The paradigmatic understanding of the physical processes operating in the relativistic jets of blazars, traditionally framed within one-zone models, has been challenged by recent observational evidence. IXPE multi-wavelength campaigns support multi-zone scenarios; delays between radio and gamma-ray flares point to jet acceleration and propagation effects; and short- and long-term inter-band...
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Andreas Zech (Observatoire de Paris)15/09/2026, 14:50Invited
Rapid variability over a large range of wavelengths is a defining feature of blazars and radio galaxies. The shortest time scales are observed at the highest gamma-ray energies, with significant flux variations over a few days or hours not uncommon, while the most extreme events reach the minute time scale. The origin of the underlying processes is not well known, but most scenarios place the...
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Zongnan Li (Korea Astronomy and Space Science Institute)15/09/2026, 15:20
Galactic circumnuclear regions, where stars and supermassive black holes interact with the interstellar medium, are crucial for understanding black hole feeding, feedback, and galaxy co-evolution. However, the connection between black hole feedback and the surrounding interstellar medium remains elusive. Using CAHA/PPAK and JWST observations, we investigate multi-scale outflows in the nearest...
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Lorenzo Evangelista (Institut d'astrophysique de Paris)15/09/2026, 15:40
Supermassive black holes power Active Galactic Nuclei (AGN), injecting energy that regulates accretion and shapes host galaxies. We investigate the morphology, excitation, and kinematics of molecular hydrogen (H2) in the inner circumnuclear disk of Centaurus A, the nearest radio galaxy. We present JWST/MIRI MRS integral-field spectroscopy of the central 170x100 pc2 at 0.3"-0.7" (5-12 pc)...
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Khushboo Khushboo (European Southern Observatory)15/09/2026, 16:30Regular
Obscured active galactic nuclei (AGN) represent a crucial phase of supermassive black hole growth, in which dense circumnuclear dust hides the central engine and reprocesses its radiation into the infrared. Earlier mid-infrared observations with the Spitzer Space Telescope provided key constraints on dusty torus models but lacked the sensitivity and spectral resolution required to reveal...
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Helene Kast15/09/2026, 16:50Regular
Understanding the interplay between AGN and their host galaxies is central to modern galaxy evolution studies. As we move beyond isolated diagnostics toward a unified, multi-wavelength framework, understanding the reliability and limits of AGN classification methods becomes necessary for interpreting the feedback mechanisms that shape galaxies. We address this challenge by combining optical...
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Bruno Slaus (Astronomical Observatory Institute, Faculty of Physics and Astronomy, Adam Mickiewicz University, ul. Słoneczna 36, 60-286 Pozna´n, Poland)15/09/2026, 17:10flash talk
Since their discovery, due to a very negative K-correction and strong constraints on the evolutionary models, galaxies detected in the sub-millimeter part of the spectrum have remained an important part of understanding galaxy evolution. Physically, they correspond to dusty star-forming galaxies. However, a number of them also host AGNs, as evidenced by a number of previous studies. In this...
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Dr Paolo Padovani16/09/2026, 09:00Invited
I will reflect on my career in AGN research, highlighting the scientific topics I have worked on and, above all, the many colleagues and collaborators with whom I have shared this scientific journey over the years.
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Prof. Elisa Resconi (Technical University Munich)16/09/2026, 09:40Invited
I will review recent results from neutrino observations of AGNs.
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Prof. Narek Sahakyan (ICRANET-Armenia IO)16/09/2026, 10:10Invited
The discovery of astrophysical neutrinos has opened a new window on the non-thermal Universe, with blazars being among the leading candidate source classes. Their relativistic jets provide favorable conditions for the acceleration of particles to ultra-high energies, potentially producing high-energy neutrinos together with electromagnetic radiation. In this contribution, I will discuss the...
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Dr Xavier Rodrigues (European Southern Observatory)16/09/2026, 11:10Invited
For the past decade, the IceCube South Pole observatory has revealed indications of high-energy neutrino emission from blazars, powerful black-hole jets aligned with our line of sight. This supports the theoretical expectation that relativistic jets are efficient hadronic accelerators. However, neutrino data face limited statistics, and state-of-the-art source models suffer from critical...
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Luca Foffano (INAF Rome (IAPS))16/09/2026, 11:40flash talk
The identification of environmental large-scale structures in active galactic nuclei typically relies on the analysis of absorption and emission lines in their optical spectrum. In BL Lac objects, however, the dominant non-thermal jet emission obscures thermal signatures, making such detections challenging.
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Despite this complexity, these environmental photon fields may interact with gamma... -
Harshita Bhuyan (Max Planck Institute for Astronomy Heidelberg, Indian Institute of Technology Indore)16/09/2026, 12:00Regular
Active Galactic Nuclei (AGN) and their relativistic jets are among the most energetic astrophysical systems, serving as promising sites for particle acceleration and multi-messenger emission. Despite decades of study, the matter composition of AGN jets remains an open question. The particles inside an AGN jet can be accelerated to high energies via different mechanisms, including shocks,...
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Frank Rieger (IPP)16/09/2026, 12:20Regular
Stochastic Fermi-type particle acceleration has emerged as a compelling mechanism for the efficient energization of particles in supermassive black hole systems. I will discuss recent advances, and exemplarily highlight: (i) the role of shear acceleration in sustaining ultra-relativistic electrons and protons in large-scale jets such as in Centaurus A, (ii) its implications for the production...
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Tullia Sbarrato (INAF - Osservatorio Astronomico di Brera)16/09/2026, 14:40Invited
AGN have long been regarded as prime candidates for high-energy astrophysical neutrino emission, particularly jetted AGN, which make up about 10% of the population. The association of a neutrino and a neutrino flux excess with the blazar TXS 0506+056 confirmed this expectation and revived the debate on jet particle composition. The multimessenger picture changed significantly when the most...
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Artem Bohdan (Max Planck Institute for Plasma Physics)16/09/2026, 15:10Regular
Plasma shock waves are among the most promising sites for efficient particle acceleration in extragalactic jets. In mildly relativistic electron–ion shocks, electrons can be heated to high Lorentz factors, providing a natural explanation for the large minimum electron energies often required to model the emission of BL Lac objects (Arbet-Engels et al. 2025). In this work, we present results...
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Prathamesh Ratnaparkhi (IUCAA, Pune, India)16/09/2026, 15:30Regular
Radio observations of restarted jets in active galaxies reveal complex morphologies and spectral signatures that trace episodic jet activity. We investigate these phenomena using high-resolution 3D simulations with the PLUTO code, combined with Lagrangian macroparticles to model non-thermal electrons. This framework enables spatially resolved modelling of synchrotron emission, spectral index,...
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Sruthi Suresh (University of Melbourne)16/09/2026, 15:50Regular
We present a multiwavelength study of 798 Type 1 and 2607 Type 2 active galactic nuclei (AGN), combining optical spectroscopy with X-ray data from eROSITA and infrared observations from WISE. We investigate a scenario in which AGN accretion can weaken, disappear, and reform, driving structural changes across the nucleus with characteristic timescales. We find ~1000 low luminosity optically...
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Karolina Garcia (NCSA, University of Illinois)16/09/2026, 16:40Regular
The far-infrared (FIR) regime offers a unique, dust-penetrating window into AGN activity that is inaccessible to X-ray, optical, and radio surveys. While multi-wavelength approaches have been transformative for unobscured AGN demographics, the heavily obscured population (believed to dominate at cosmic noon) remains poorly characterized. FIR fine-structure lines are powerful...
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Andrea Travascio (INAF)16/09/2026, 17:00Regular
Overdense cosmic structures at high redshift (z~2-4) offer a unique laboratory to study the baryon cycle during the peak of galaxy assembly. This work connects the environmental impact of massive structures with the microscopic physical state of the circumgalactic medium (CGM) through a two-fold approach. First, we investigate the MQN01 protocluster, an exceptionally dense region hosting a...
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Vincenzo Mainieri (ESO)17/09/2026, 10:00Invited
AGN feedback is a complex problem. It involves multiple spatial scales, multiple gas phases and mass scales, multiple physical processes and timescales. Recent progress has been accelerated by an increase in both computational developments and observational facilities. The past years have witnessed the dawn of a new range of sub-grid models for AGN feedback, incorporated into...
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Swetha Sankar (Johns Hopkins)17/09/2026, 10:30Regular
Blue low-excitation radio galaxies (BLERGs) may expose a missing evolutionary axis in radio-AGN unification. In the canonical picture, low-excitation radio galaxies are powered by radiatively inefficient accretion in massive, quiescent hosts, where mechanical feedback suppresses cooling and star formation. BLERGs break this expectation: they retain ongoing star formation and substantial...
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Payel Nandi17/09/2026, 10:50Regular
Active galactic nuclei (AGN) drive multiphase outflows via both radiative and jet modes. While these outflows are extensively studied using traditional tracers—such as [O III] for ionized gas and H₂ or CO for molecular gas—and ultra-fast outflows (UFOs) are identified via extreme X-ray absorption, the intermediate-to-high ionization phase remains poorly understood. This regime (up to $\sim...
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Lea Marcotulli (DESY Zeuthen)17/09/2026, 11:40Invited
Blazar jets are among the most powerful particle accelerators in the Universe and provide a unique window into the growth of supermassive black holes across cosmic time. By tracing the evolution of blazar populations, we can investigate the connection between jet production and the rapid assembly of the earliest supermassive black holes, test whether the properties and power of relativistic...
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Kirill Grishin (LUX, Paris Observatory)17/09/2026, 12:10Regular
There are two primary channels of SMBH growth: accretion of infalling material and galaxy mergers that lead to the mergers of their central black holes. The latter growth pathway results into the scaling relations between central black hole mass and intrinsic properties of the host galaxy (e.g., bulge stellar mass (Mbulge), velocity dispersion of stars in the bulge).
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Our goal is to extend... -
Regular
The dispersion measures (DMs) of Fast Radio Bursts (FRBs) arise predominantly from free electrons in the large-scale structure of the Universe. The increasing number of FRB observations have started to empirically constrain the distribution of cosmic baryons, providing new, stringent tests of AGN feedback models implemented in cosmological simulations.
In this talk, I present a novel...
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Josephine Chishala (Botswana International Universityof Science and Technology)Regular
Galaxy mergers are expected to have a profound influence on the star formation histories of galaxies. It is generally expected
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that mergers are the main drivers of galaxy mass growth through the accretion of mass and the triggering of new star formation
episodes, while the shocks and torques induced by the merger may drive gas and dust to central supermassive black holes and fuel
active... -
Regular
Outflows are crucial to AGN feedback, transporting mass and energy from the nucleus to the host galaxy across various scales. Theoretical models suggest that sub-relativistic Ultra Fast Outflows (UFOs), which interact with the ISM, decelerate and lose ionization, potentially driving large-scale, multi-phase outflows observable in optical and molecular gas.
The Narrow Line Seyfert 1 galaxy...
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Regular
After decades of not finding dark matter, we've gotten creative.
While liquid xenon detectors lead the direct search for 10-1000 GeV dark matter, sub-GeV dark matter particles from the local halo cannot transfer enough energy through nuclear scattering to be detected.
Blazars offer a solution. These supermassive black holes emit powerful particle jets directly toward Earth, and when dark...
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Alberto Moretti (INAF - OAB)Regular
The astrophysical origins of extragalactic high-energy neutrinos remain an open question, although AGN are considered the strongest candidates. Yet, the specific emission sites within these accreting supermassive black hole systems, such as the relativistic jets versus the accretion disk or corona, are still debated. To investigate this, we cross-matched well localized neutrino events from the...
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Geometric constraints on the inner regions of active galactic nuclei (AGN) are crucial for uncovering the behaviour of matter in extreme gravity and for testing general relativity. A time lag between lightcurves in different energy bands is imprinted by the different path lengths between direct coronal photons and those reflected from the surrounding accretion disc. The lag-energy spectrum...
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Regular
ABSTRACT
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PKS 1345 + 12 is both an Ultraluminous infrared galaxy (ULIRG) and a young radio galaxy at z = 0.122, representing a late-stage major merger in the early phase of AGN activity. We present a spatially resolved analysis of the ionized gas outflow in the young radio source. Using VLT/MUSE integral field spectroscopy: Spectra were extracted in concentric annuli centered on the nucleus,... -
Regular
The “Fundamental Plane of Black Hole Activity (fundamental plane)” defines a correlation between X-ray and radio emission of Active Galactic Nuclei (AGN) and the mass of the accreting black hole (BH), serving as a primary indicator of disk-jet coupling in AGN across all accretion rates. However, the impact of intrinsic X-ray and radio variability on this relationship remains poorly understood....
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Regular
Hyper-luminous quasars offer a unique opportunity to investigate the interplay between rapid SMBH growth, AGN feedback, and the evolution of massive galaxies at the peak epoch of quasar activity. In this talk, I will present recent results from the WISE/SDSS-selected hyper-luminous quasar survey (WISSH), a multi-wavelength observing program designed to study a representative sample of about 90...
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Pranav Kukreti (Heidelberg University)Regular
Active galactic nucleus (AGN) feedback is a key process in galaxy evolution, particularly at cosmic noon, when star formation and black hole accretion rates were at their peak. The jets and radiation are capable of injecting energy on the host galaxy and the circumgalactic medium (CGM) scales. In this context, high-redshift radio galaxies (HzRGs) are unique systems, as they host both — radio...
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Regular
OH megamasers are key tracers of extreme environments in [U]LIRGs. We present a study of the megamaser galaxy IRAS 10039−3338 using HST and MUSE/VLT data to investigate the links between mergers, Stellar Population, star formation, and AGN activity. Results reveal a disturbed morphology and complex kinematics fueled by a 1010M⊙ molecular gas reservoir. With an SFR of 1.97M⊙ yr−1 and a...
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Regular
Relativistic jets from active galactic nuclei are expected to exhibit strong redshift evolution in their radiative output due to the increasing energy density of the cosmic microwave background (CMB). In this presentation, we will show how inverse Compton (IC) scattering of CMB photons shapes the radio and X-ray emission from large-scale jets. Our study is based on three-dimensional...
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Regular
Changing-Look AGN (CL-AGN) are AGN which transition between Seyfert types, challenging AGN unification models. The cause of CL-AGN transitions is unknown, but popular theories include tidal disruption events in AGN disks, disk instabilities, transitions between radiatively efficient and inefficient accretion flows. Most CL-AGN have been identified via repeat spectroscopy, making it difficult...
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Regular
Originally radio and optical observations were at the core of blazar selection and classification and the term blazar was used to group flat-spectrum compact radio sources with smooth nonthermal continua which showed strongly polarized, violently variable emission. The term was widely used under the framework of unification of radio-loud sources where relativistic beaming turns the observed...
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Navaneeth P K (Janusz Gil Institute of Astronomy, University of Zielona Góra)flash talk
The blazar B2 1420+32 (OQ 334, z = 0.682) has recently emerged as a primary laboratory for studying the "changing-look" (CL) phenomenon in jetted active galactic nuclei, characterized by transitions between FSRQ and BL Lac states. We present a detailed investigation into the complex nature of its X-ray emission using Swift-XRT observations spanning MJD 58095--60580. Using Bayesian Blocks...
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Regular
Steep X-ray spectra in active galactic nuclei (AGN) are widely interpreted as a signature of high accretion rates, a claim gaining renewed relevance in light of the JWST discoveries of X-ray-weak AGN at high redshift. Are these primeval objects accreting near or beyond the Eddington limit? To address this, we analyzed the X-ray emission of a large AGN sample from the latest Sloan Digital Sky...
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