0000000000134122

AUTHOR

Z. Younsi

showing 3 related works from this author

Using evolutionary algorithms to model relativistic jets

2019

High-resolution Very-Long-Baseline Interferometry observations of NGC 1052 show a two sided jet with several regions of enhanced emission and a clear emission gap between the two jets.This gap shrinks with increasing frequency and vanishes around $\nu\sim43$ GHz. The observed structures are due to both the macroscopic fluid dynamics interacting with the surrounding ambient medium including an obscuring torus and the radiation microphysics. In this paper we investigate the possible physical conditions in relativistic jets of NGC 1052 by directly modelling the observed emission and spectra via state-of-the-art special-relativistic hydrodynamic (SRHD) simulations and radiative transfer calcula…

High Energy Astrophysical Phenomena (astro-ph.HE)PhysicsJet (fluid)010504 meteorology & atmospheric sciencesMicrophysicsComputer Science::Information RetrievalAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstronomy and AstrophysicsContext (language use)TorusAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsAstrophysics - Astrophysics of Galaxies01 natural sciencesAstrophysical jetSpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)0103 physical sciencesVery-long-baseline interferometryRadiative transferFluid dynamicsAstrophysics - High Energy Astrophysical Phenomena010303 astronomy & astrophysics0105 earth and related environmental sciencesAstronomy & Astrophysics
researchProduct

Gravitational Test beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole

2020

All authors: Psaltis, Dimitrios; Medeiros, Lia; Christian, Pierre; Özel, Feryal; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Ball, David; Baloković, Mislav; Barrett, John; Bintley, Dan; Blackburn, Lindy; Boland, Wilfred; Bower, Geoffrey C.; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke Broguiere, Dominique; Bronzwaer, Thomas; Byun, Do-Young; Carlstrom, John E.; Chael, Andrew; Chan, Chi-kwan; Chatterjee, Shami; Chatterjee, Koushik; Chen, Ming-Tang; Chen, Yongjun; Cho, Ilje; Conway, John E.; Cordes, James M.; Crew, Geoffrey B.; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvign…

High Energy Astrophysical Phenomena (astro-ph.HE)Event Horizon TelescopePhysicsGravitational waveAstronomyKerr metricFOS: Physical sciencesGeneral Physics and AstronomyGeneral Relativity and Quantum Cosmology (gr-qc)Gravitation and Astrophysics01 natural sciencesGeneral Relativity and Quantum CosmologyBlack holeGravitationGeneral Relativity and Quantum Cosmology0103 physical sciencesMetric (mathematics)Shadow[PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]Statistical physics[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]010306 general physicsAstrophysics - High Energy Astrophysical PhenomenaParametric statisticsPhysical Review Letters
researchProduct

3C 279 Event Horizon Telescope imaging

2020

3C 279 is an archetypal blazar with a prominent radio jet that show broadband flux density variability across the entire electromagnetic spectrum. We use an ultra-high angular resolution technique - global Very Long Baseline Interferometry (VLBI) at 1.3mm (230GHz) - to resolve the innermost jet of 3C 279 in order to study its fine-scale morphology close to the jet base where highly variable gamma-ray emission is thought to originate, according to various models. The source was observed during four days in April 2017 with the Event Horizon Telescope (EHT) at 230 GHz, including the phased Atacama Large Millimeter/submillimeter Array (ALMA), at an angular resolution of ~20uarcsec (at a redshif…

observational astronomygalactic and extragalactic astronomyAstrophysics and AstronomyInterferometryAstrophysics::High Energy Astrophysical PhenomenaRadio galaxiesPhysicsGalaxiesNatural Sciences
researchProduct