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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…
Non-thermal X-ray Emission from Merging Massive Black Hole Binaries
Luke Krauth, Jordy Davelaar
Recent hydrodynamical simulations have identified a disappearing thermal X-ray signature in massive black hole binaries (MBHBs) embedded in circumbinary disks, arising from the tid…
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…
Self-lensing flares from black hole binaries V: systematic searches in LSST
Kevin Park, Zoltan Haiman, Chengcheng Xin +3
The Vera C. Rubin Observatory has now seen first light, and over a 10 year duration, LSST is projected to catalogue tens of millions of quasars, many of which are expected to be as…
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…
Fill the gaps: continuous in time interpolation of fluid dynamical simulations
Jonas Pronk, Oliver Porth, Jordy Davelaar
Flexible and accurate interpolation schemes using machine learning could be of great benefit for many use-cases in numerical simulations and post-processing, such as temporal upsam…
Changing-Look AGN Powered By Disk Tearing
Nicholas Kaaz, Matthew Liska, Charlotte Ward +1
Changing-look active galactic nuclei (CLAGN) feature order-of-magnitude variability in both the continuum and broad line luminosities on months-to-years long timescales, and are cu…
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…
A search for periodic AGN variability in Data Release 3
Pablo Huijse, Jordy Davelaar, Joris De Ridder +2
Supermassive black hole binaries (SMBHB) are expected to produce periodic modulations in active galactic nuclei (AGN) light curves, but distinguishing such signals from stochastic…
Modeling of lightcurves from reconnection-powered very high energy flares from M87*
Siddhant Solanki, Jordy Davelaar, Bart Ripperda +1
The black hole at the center of M87 is observed to flare regularly in the very high energy (VHE) band, with photon energies GeV. The rapid variability, which can be a…
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…
Thermal X-ray signatures in late-stage unequal-mass massive black hole binary mergers
Luke Major Krauth, Jordy Davelaar, Zoltán Haiman +3
The multi-messenger combination of gravitational waves (GWs) from merging massive black hole binaries (MBHBs) and the electromagnetic (EM) counterpart from the surrounding circumbi…
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…
Pulse Profiles of Accreting Neutron Stars from GRMHD Simulations
Pushpita Das, Tuomo Salmi, Jordy Davelaar +2
The pulsed X-ray emission from the neutron star surface acts as a window to study the state of matter in the neutron star interior. For accreting millisecond pulsars, the surface X…
Bulk Motions in the Black Hole Jet Sheath as a Candidate for the Comptonizing Corona
Navin Sridhar, Bart Ripperda, Lorenzo Sironi +2
Using two-dimensional general relativistic resistive magnetohydrodynamic simulations, we investigate the properties of the sheath separating the black hole jet from the surrounding…
Machine- and deep-learning-driven angular momentum inference from BHEX observations of the photon ring
Joseph R. Farah, Jordy Davelaar, Daniel Palumbo +2
The photon ring is an important probe of black hole (BH) properties and will be resolved by the Black Hole Explorer (BHEX) for the first time. However, extraction of black ho…
Machine-Learning Characterization of Intermittency in Relativistic Pair Plasma Turbulence: Single and Double Sheet Structures
Trung Ha, Joonas Nättilä, Jordy Davelaar +1
The physics of turbulence in magnetized plasmas remains an unresolved problem. The most poorly understood aspect is intermittency -- spatio-temporal fluctuations superimposed on th…
Self-lensing flares from black hole binaries IV: the number of detectable shadows
Kevin Park, Chengcheng Xin, Jordy Davelaar +1
Sub-parsec supermassive black hole (SMBH) binaries are expected to be common in active galactic nuclei (AGN), as a result of the hierarchical build-up of galaxies via mergers. Whil…
MLody -- Deep Learning Generated Polarized Synchrotron Coefficients
Jordy Davelaar
Polarized synchrotron emission is a fundamental process in high-energy astrophysics, particularly in the environments around black holes and pulsars. Accurate modeling of this emis…
Relativistic Binary Precession: Impact on Eccentric Binary Accretion and Multi-Messenger Astronomy
Stanislav DeLaurentiis, Zoltan Haiman, John Ryan Westernacher-Schneider +4
Recent hydrodynamical simulations have shown that circumbinary gas disks drive the orbits of binary black holes to become eccentric, even when general relativistic corrections to t…
Broadband Multi-wavelength Properties of M87 during the 2018 EHT Campaign including a Very High Energy Flaring Episode
J. C. Algaba, M. Balokovic, S. Chandra +738
The nearby elliptical galaxy M87 contains one of the only two supermassive black holes whose emission surrounding the event horizon has been imaged by the Event Horizon Telescope (…
Imaging the event horizon of M87* from space on different timescales
Anastasia Shlentsova, Freek Roelofs, Sara Issaoun +2
The concept of a new space very long baseline interferometry system named the Event Horizon Imager (EHI) has been proposed to dramatically improve black hole imaging and provide pr…
Ordered magnetic fields around the 3C 84 central black hole
G. F. Paraschos, J. -Y. Kim, M. Wielgus +279
3C84 is a nearby radio source with a complex total intensity structure, showing linear polarisation and spectral patterns. A detailed investigation of the central engine region nec…