A5056082943- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Black Holes and Theoretical Physics
- Galaxies: Formation, Evolution, Phenomena
- Gyrotron and Vacuum Electronics Research
- Relativity and Gravitational Theory
Northwestern University
2019-2024
Neutron star mergers are unique laboratories of accretion, ejection, and r-process nucleosynthesis. We used 3D general relativistic magnetohydrodynamic simulations to study the role post-merger magnetic geometry in evolution merger remnant discs around stationary Kerr black holes. Our fully capture mass jet production, owing their exceptionally long duration exceeding $4$ s. Poloidal field configurations produce jets with energies $E_\mathrm{jet} \sim (4{-}30)\times10^{50}$ erg, isotropic...
Long-duration $\gamma$-ray bursts (GRBs) accompany the collapse of massive stars and carry information about central engine. However, no 3D models have been able to follow these jets from their birth by a black-hole (BH) photosphere. We present first such general-relativity magnetohydrodynamic simulations, which span over 6 orders magnitude in space time. The collapsing stellar envelope forms an accretion disk, drags inwardly magnetic flux that accumulates around BH, becomes dynamically...
Abstract Spinning supermassive black holes (BHs) in active galactic nuclei magnetically launch relativistic collimated outflows, or jets. Without angular momentum supply, such jets are thought to perish within 3 orders of magnitude distance from the BH, well before reaching kiloparsec scales. We study survival at largest scale separation date, via 3D general magnetohydrodynamic simulations rapidly spinning BHs immersed into uniform zero-angular-momentum gas threaded by a weak vertical...
We present a suite of the first 3D GRMHD collapsar simulations, which extend from self-consistent jet launching by an accreting Kerr black hole (BH) to breakout star. identify three types outflows, depending on angular momentum, $ l $, collapsing material and magnetic field, B BH horizon: (i) Subrelativistic outflow (low high $), (ii) Stationary accretion shock instability (SASI; low (iii) Relativistic jets (high $). In absence jets, free-fall stellar envelope provides good estimate for...
X-shaped radio galaxies (XRGs) produce misaligned jet pairs and make up $\lesssim10\%$ of galaxies. XRGs are thought to emerge in featuring a binary supermassive black hole ($\rm SMBH$), $\rm SMBH$ merger, or large-scale ambient medium asymmetry. We demonstrate that XRG morphology can naturally form without such special, preexisting conditions. Our 3D general-relativistic magnetohydrodynamic (GRMHD) simulation for the first time follows magnetized rotating gas from outside sphere influence...
We present uniformly reprocessed and re-calibrated data from the RoboPol programme of optopolarimetric monitoring active galactic nuclei (AGN), covering observations between 2013, when instrument was commissioned, 2017. In total, dataset presented in this paper includes 5068 222 AGN with Dec > -25 deg. describe current version pipeline that used to process calibrate entire dataset, we make publicly available for use by astronomical community. Average quantities summarising behaviour (average...
Abstract Accreting supermassive black holes (SMBHs) produce highly magnetized relativistic jets that tend to collimate gradually as they propagate outward. However, recent radio interferometric observations of the 3C 84 galaxy reveal a stunning, cylindrical jet already at several hundred SMBH gravitational radii, r ≳ 350 g . We explore how such extreme collimation emerges via suite 3D general magnetohydrodynamic simulations. consider an surrounded by torus immersed in constant-density...
Abstract Models invoking magnetic reconnection as the particle acceleration mechanism within relativistic jets often adopt a gradual energy dissipation profile jet. However, such has yet to be reproduced in first-principles simulations. Here we perform suite of 3D general magnetohydrodynamic simulations post–neutron star merger disks with an initially purely toroidal field. We explore variations both microphysics (e.g., nuclear recombination, neutrino emission) and system parameters (e.g,...
Spinning supermassive black holes (BHs) in active galactic nuclei (AGN) magnetically launch relativistic collimated outflows, or jets. Without angular momentum supply, such jets are thought to perish within $3$ orders of magnitude distance from the BH, well before reaching kpc-scales. We study survival at largest scale separation date, via 3D general magnetohydrodynamic simulations rapidly spinning BHs immersed into uniform zero-angular-momentum gas threaded by weak vertical magnetic field....
Accreting supermassive black holes (SMBHs) produce highly magnetized relativistic jets that tend to collimate gradually as they propagate outward. However, recent radio interferometric observations of the 3C 84 galaxy reveal a stunning, cylindrical jet already at several hundred SMBH gravitational radii, $r\gtrsim350r_{\rm g}$. We explore how such extreme collimation emerges via suite 3D general-relativistic magnetohydrodynamic (GRMHD) simulations. consider an surrounded by torus immersed in...