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Bayesian Evidence for Inspiraling Hotspot Motion in the Galactic Center
Pablo Ruales, Maciek Wielgus, Delilah E. A. Gates +1
During flaring episodes, polarimetric observations of the Galactic Center black hole Sagittarius A* (Sgr A*) reveal evolving, loop-like trajectories in the Stokes Q-U plane, the so…
Dissecting the variability of Sagittarius A* in the orbiting hotspot framework
Maciek Wielgus, Aristomenis Yfantis
Sagittarius A* (Sgr A*) exhibits intermittent flaring behavior, characterized by strong enhancements in high-energy emission (infrared and X-ray). These events have been interprete…
Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign
G. Principe, J. C. Algaba, E. Aviano +529
The archetypal blazar 3C 279 hosts a prominent relativistic jet and exhibits strong broadband variability across the electromagnetic spectrum. In April 2017, the Event Horizon Tele…
Polarized emission of orbiting hot-spots near Sagittarius A*: effects of electromagnetic interaction
Abylaikhan Tlemissov, Arman Tursunov, Maciek Wielgus
We investigate the polarimetric signatures of orbiting hot-spots around a Schwarzschild black hole in the presence of an external magnetic field, accounting for the electromagnetic…
Polarization Signatures from GRMHD Simulations of Black Hole Accretion
P. Chris Fragile, Maciek Wielgus, Cora Prather
This chapter tells the still-unfolding story of extracting polarization signatures from general relativistic magnetohydrodynamics simulations of accretion disks. In some sense, thi…
GRMHD accretion beyond the black hole paradigm: Light from within the shadow
Saurabh, Maciek Wielgus, Parth Bambhaniya +3
We present the first three-dimensional general relativistic magnetohydrodynamic simulation of sustained accretion onto a horizonless singularity in which matter reaches the central…
Radiative GRMHD simulations of puffy accretion discs: Numerical versus analytical models of sub-Eddington accretion
Debora Lančová, Maciek Wielgus, Marek Abramowicz +6
A widely accepted picture of an accretion flow in the luminous soft spectral state of X-ray binary systems is a geometrically thin disc structure much like the classic analytic sol…
Universal behaviour of -viscosity in black hole accretion discs
Marek A. Abramowicz, Axel Brandenburg, Jiří Horák +4
The Shakura-Sunyaev -viscosity coefficient, defined as the ratio of total stress to total pressure, , began to play an important role in the development of accr…
Locating the missing large-scale emission in the jet of M87* with short EHT baselines
Boris Georgiev, Paul Tiede, Sebastiano D. von Fellenberg +280
In Very-Long Baseline Interferometric arrays, nearly co-located stations probe the largest scales and typically cannot resolve the observed source. In the absence of large-scale st…
Ring Asymmetry and Spin in M87*
Vadim Bernshteyn, Nicholas S. Conroy, Michi Bauböck +263
Event Horizon Telescope (EHT) images of the supermassive black hole M87* depict an asymmetric ring of emission. General relativistic magnetohydrodynamic (GRMHD) models of M87* and…
Probing jet base emission of M87* with the 2021 Event Horizon Telescope observations
Saurabh, Hendrik Müller, Sebastiano D. von Fellenberg +282
We investigate the presence and spatial characteristics of the jet base emission in M87* at 230 GHz, enabled by the enhanced uv coverage in the 2021 Event Horizon Telescope (EHT) o…
Extreme-Lensing Signatures Revealed by Correlations of Simulated Black-Hole Movies
Barbora Bezděková, Shahar Hadar, George Wong +1
A black hole's gravitational pull can deflect light rays to an arbitrary degree. As a result, any source fluctuation near the black hole creates multiple lagged images on an observ…
Revisiting 3C 279 jet morphology with space VLBI at 26 microarcsecond resolution
Teresa Toscano, José L. Gómez, Guang-Yao Zhao +12
We present observations of the blazar 3C 279 at 22 GHz using the space VLBI mission RadioAstron on 2018 January 15. Images in both total intensity and fractional polarization are r…
Revealing a ribbon-like jet in OJ 287 with RadioAstron
E. Traianou, J. L. Gomez, I. Cho +17
We present space-based very long baseline interferometry observations of the BL Lac type object OJ 287 taken with RadioAstron at 22 GHz on April 25, 2016, in conjunction with a gro…
Semi-analytic studies of accretion disk and magnetic field geometry in M87*
Saurabh, Maciek Wielgus, Arman Tursunov +2
Context: Magnetic fields play a pivotal role in dynamics of black hole accretion flows and formation of relativistic jets. Observations by the Event Horizon Telescope (EHT) provide…
The infrared jet of M87 observed with JWST
Jan Röder, Maciek Wielgus, Joseph B. Jensen +2
We present the first JWST+NIRCam images of the giant elliptical active galaxy M87 and its jet at 0.90, 1.50, 2.77 and 3.56 m. We analysed the large-scale jet structure, identify…
Gravity versus astrophysics in black hole images and photon rings: Equatorial emissions and spherically symmetric space-times
I. Urso, F. H. Vincent, M. Wielgus +2
The EHT collaboration released in 2019 the first horizon-scale images of a black hole accretion flow, opening a novel route for plasma physics comprehension and gravitational tests…
Origin of the ring ellipticity in the black hole images of M87*
Rohan Dahale, Ilje Cho, Kotaro Moriyama +273
We investigate the origin of the elliptical ring structure observed in the images of the supermassive black hole M87*, aiming to disentangle contributions from gravitational, astro…
Novel Polarimetric Analysis of Near Horizon Flaring Episodes in M87* in Millimeter Wavelength
Razieh Emami, Matthew Liska, Koushik Chatterjee +15
Recent multi-wavelength observations of M87* \citep{2024A&A...692A.140A} revealed a high-energy -ray flare without a corresponding millimeter counterpart. We present a theoretic…
Dynamical Inference from Polarized Light Curves of Sagittarius A*
Angelo Ricarte, Nicholas S. Conroy, Maciek Wielgus +3
Polarimetric light curves of Sagittarius A* (Sgr A*) sometimes exhibit loops in the Stokes and plane over time, often interpreted as orbiting hotspot motion. In this work,…
The putative center in NGC 1052
Anne-Kathrin Baczko, Matthias Kadler, Eduardo Ros +284
Many active galaxies harbor powerful relativistic jets, however, the detailed mechanisms of their formation and acceleration remain poorly understood. To investigate the area of je…
A multi-frequency study of sub-parsec jets with the Event Horizon Telescope
Jan Röder, Maciek Wielgus, Andrei P. Lobanov +287
The 2017 observing campaign of the Event Horizon Telescope (EHT) delivered the first very long baseline interferometry (VLBI) images at the observing frequency of 230 GHz, leading…
Pseudo-Newtonian simulation of a thin accretion disk around a Reissner-Nordström naked singularity
Miljenko Čemeljić, Włodek Kluźniak, Ruchi Mishra +1
We present the first numerical simulations of a thin accretion disk around a Reissner-Nordström (RN) naked singularity (a charged point mass). The gravity of the RN naked singulari…
Helical magnetic field structure in 3C 273. A Faraday rotation analysis using multi-frequency polarimetric VLBA data
Teresa Toscano, Sol N. Molina, José L. Gómez +12
We present a study on rotation measure (RM) of the quasar 3C 273. This analysis aims to discern the magnetic field structure and its temporal evolution. The quasar 3C 273 is one of…