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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…
Demystifying flux eruptions: Magnetic flux transport in magnetically arrested disks
Jonatan Jacquemin-Ide, Mitchell C. Begelman, Beverly Lowell +3
Magnetically arrested disks (MADs) are a compelling model for explaining variability in low-luminosity active galactic nuclei (AGN), including horizon-scale outbursts like those ob…
Universal Radial Scaling of Large-Scale Black Hole Accretion for Magnetically Arrested And Rocking Accretion Disks
Aretaios Lalakos, Alexander Tchekhovskoy, Elias R. Most +3
Accretion onto supermassive black holes (BHs) can launch relativistic jets that inject energy and momentum into their surroundings. Understanding how such feedback shapes large-sca…
Black hole spectral states revealed in GRMHD simulations with texture memory accelerated cooling
Pedro Naethe Motta, Jonatan Jacquemin-Ide, Rodrigo Nemmen +2
X-ray binaries (XRBs) display spectral state transitions that are accompanied by substantial changes in the hardness, luminosity, and structure of the accretion flow. We developed…
Black Hole Spin-down in Collapsars in 3D Neutrino Transport GRMHD Simulations
Danat Issa, Beverly Lowell, Jonatan Jacquemin-Ide +2
Collapsars -- massive stars whose cores promptly collapse into black holes (BHs) -- can power long-duration gamma-ray bursts (LGRBs) via relativistic, collimated, electromagnetical…
Evidence for Low Universal Equilibrium Black Hole Spin in Luminous Magnetically Arrested Disks
Beverly Lowell, Jonatan Jacquemin-Ide, Matthew Liska +1
Relativistic collimated outflows, or jets, provide a crucial mode of active galactic nucleus feedback. Although jets extract their energy from the black hole (BH) rotation, their e…
Two-temperature treatments in magnetically arrested disk GRMHD simulations more accurately predict light curves of Sagittarius A*
León Salas, Matthew Liska, Sera Markoff +6
The Event Horizon Telescope Collaboration (EHTC) observed the Galactic centre source Sagittarius A* (Sgr A*) and used emission models primarily based on single ion temperature (1T)…
Magnetically-Driven Neutron-Rich Ejecta Unleashed: Global 3D Neutrino-General Relativistic Magnetohydrodynamic Simulations of Collapsars Probe the Conditions for r-process Nucleosynthesis
Danat Issa, Ore Gottlieb, Brian Metzger +5
Collapsars - rapidly rotating stellar cores that form black holes - can power gamma-ray bursts (GRBs) and are proposed to be key contributors to the production of heavy elements in…
H-AMR FORGE'd in FIRE I: Magnetic state transitions, jet launching and radiative emission in super-Eddington, highly magnetized quasar disks formed from cosmological initial conditions
Nicholas Kaaz, Matthew Liska, Alexander Tchekhovskoy +2
Quasars are powered by supermassive black hole (SMBH) accretion disks, yet standard disk models are inconsistent with many quasar observations. Recently, Hopkins et al. (2024) simu…
Extreme scale height variations and nozzle shocks in warped disks
Nicholas Kaaz, Yoram Lithwick, Matthew Liska +1
Accretion disks around both stellar-mass and supermassive black holes are likely often warped. Whenever a disk is warped, its scale height varies with azimuth. Sufficiently strong…
Strongly magnetized accretion with low angular momentum produces a weak jet
Alisa Galishnikova, Alexander Philippov, Eliot Quataert +2
We study the spherical accretion of magnetized plasma with low angular momentum onto a supermassive black hole, utilizing global general relativistic magnetohydrodynamic simulation…
Extreme magnetic fields around black holes
Koushik Chatterjee, Matthew Liska, Alexander Tchekhovskoy +2
Recent results of the event horizon-scale images of M87* and Sagittarius A* from the Event Horizon Telescope Collaboration show that strong magnetic fields are likely present aroun…
Resolution analysis of magnetically arrested disk simulations
León Salas, Gibwa Musoke, Koushik Chatterjee +4
Polarisation measurements by the Event Horizon Telescope from M87 and Sgr A suggest that there is a dynamically strong, ordered magnetic field, typical of what is e…
Tilted Accretion Disks
P. Chris Fragile, Matthew Liska
In this chapter, we review some of the interesting consequences that tilt between the spin axis of the black hole and angular momentum axis of the accretion disk can have on the dy…
Misaligned magnetized accretion flows onto spinning black holes: Magneto-spin alignment, outflow power, and intermittent jets
Koushik Chatterjee, Nicholas Kaaz, Matthew Liska +2
Magnetic fields regulate black hole (BH) accretion, governing both inflow and outflow dynamics. When a BH accumulates substantial vertical magnetic flux, it enters the magnetically…
Magnetorotational dynamo can generate large-scale vertical magnetic fields in 3D GRMHD simulations of accreting black holes
Jonatan Jacquemin-Ide, François Rincon, Alexander Tchekhovskoy +1
Jetted astrophysical phenomena with black hole (BH) engines, including binary mergers, jetted tidal disruption events, and X-ray binaries, require a large-scale vertical magnetic f…
How to Turn Jets into Cylinders near Supermassive Black Holes in 3D GRMHD Simulations
Valeriia Rohoza, Aretaios Lalakos, Max Paik +4
Accreting supermassive black holes (SMBHs) produce highly magnetized relativistic jets that tend to collimate gradually as they propagate outward. However, recent radio interferome…
Synchrotron polarization signatures of surface waves in supermassive black hole jets
Jordy Davelaar, Bart Ripperda, Lorenzo Sironi +7
Supermassive black holes in active galactic nuclei (AGN) are known to launch relativistic jets, which are observed across the entire electromagnetic spectrum and are thought to be…
Jets with a Twist: Emergence of FR0 Jets in 3D GRMHD Simulation of Zero Angular Momentum Black Hole Accretion
Aretaios Lalakos, Alexander Tchekhovskoy, Omer Bromberg +4
Spinning supermassive black holes (BHs) in active galactic nuclei (AGN) magnetically launch relativistic collimated outflows, or jets. Without angular momentum supply, such jets ar…
Winds and Disk Turbulence Exert Equal Torques on Thick Magnetically Arrested Disks
Vikram Manikantan, Nicholas Kaaz, Jonatan Jacquemin-Ide +4
The conventional accretion disk lore is that magnetized turbulence is the principal angular momentum transport process that drives accretion. However, when dynamically important la…
Large-scale Evolution of Seconds-long Relativistic Jets from Black Hole-Neutron Star Mergers
Ore Gottlieb, Danat Issa, Jonatan Jacquemin-Ide +11
We present the first numerical simulations that track the evolution of a black hole-neutron star (BH-NS) merger from pre-merger to . The disk that forms…
Hours-long Near-UV/Optical Emission from Mildly Relativistic Outflows in Black Hole-Neutron Star Mergers
Ore Gottlieb, Danat Issa, Jonatan Jacquemin-Ide +7
The ongoing LIGO-Virgo-KAGRA observing run O4 provides an opportunity to discover new multi-messenger events, including binary neutron star (BNS) mergers such as GW170817, and the…
Millimeter Observational Signatures of Flares in Magnetically Arrested Black Hole Accretion Models
He Jia, Bart Ripperda, Eliot Quataert +4
In general relativistic magneto-hydrodynamic (GRMHD) simulations, accreted magnetic flux on the black hole horizon episodically decays, during which magnetic reconnection heats up…
Relativistic Signatures of Flux Eruption Events Near Black Holes
Zachary Gelles, Koushik Chatterjee, Michael Johnson +2
Images of supermassive black holes produced using very long baseline interferometry provide a pathway to directly observing effects of a highly curved spacetime, such as a bright `…