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77 papers
Nonthermal hotspot orbiting the supermassive black hole Sgr A*
Alejandro Cruz-Osorio, David Barrero-González, Juan J. Zaldívar +1
Recent millimeter wavelength observations at 230 GHz by the Event Horizon Telescope have resolved the innermost structure of the Galactic Center, Sgr A*, revealing a ring-like stru…
Relativistic Spherical Accretion in Nonrotating Black Hole Spacetimes: Astrophysical Implications
David Barrero-González, Alejandro Cruz-Osorio
We present a systematic analysis of spherically symmetric accretion flows onto thirteen non-rotating black hole spacetimes, including charged and regular black holes, scalar and di…
Relativistic blob signatures in the M87 jet at sub-parsec scales
Donaldo Mora, Alejandro Cruz-Osorio, Erika Benítez +1
In this work, we present results from general-relativistic radiative-transfer calculations of black hole accretion and jet launching to reproduce the observed properties of the M\,…
Viscosity effects on the shadow of a non-rotating black hole
Sayantani Lahiri, Sergio Gimeno-Soler, Alejandro Cruz-Osorio +2
We study the effect of shear viscosity in stationary magnetized accretion tori on synthetic images of non-rotating black hole shadows. Shear viscosity and spacetime-curvature contr…
Dynamics and geometry of the inner sub-parsec-scale jet in 3C 279 observed with the Event Horizon Telescope
Hendrik Mueller, Sebastiano D. von Fellenberg, Ai-Ling Zeng +275
The 2021 Event Horizon Telescope observations resolve the innermost jet region of the blazar 3C279 with unprecedented detail. The reconstructed images consistently reveal a compact…
Probing radiation micro-physics in M 87 I. Total intensity and broad-band spectra
Christian M. Fromm, Yosuke Mizuno, Ziri Younsi +6
Next generation Very Long Baseline Interferometers (VLBI) will provide dense sampling of the Fourier space together with high signal to noise ratios allowing to reliably observe an…
Relativistic Common-envelope Dynamics of a Stellar-mass Black Hole II: Kerr Black Hole
Alejandro Cruz-Osorio, Fabio D. Lora-Clavijo
The common envelope phase plays a critical role in binary system evolution. In this study, we investigate the mass and momentum accretion rates during the interaction between a ste…
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…
Impacts of radiative cooling on the images of a black hole shadow and extended jets in two-temperature GRMHD simulations
Mingyuan Zhang, Yosuke Mizuno, Indu K. Dihingia +4
The recent 230 GHz observations from the Event Horizon Telescope collaboration have successfully imaged the supermassive black hole shadow of the M87 galaxy. However, the relativel…
Full-polarization millimeter wavelength variability of Sagittarius A* during the 2018 EHT campaign
Ezequiel Albentosa-Ruiz, Jasmin E. Washington, Nicola Marchili +272
Sagittarius A* (Srg A*), the supermassive black hole at the center of the Milky Way, provides a unique laboratory to study accretion dynamics and plasma processes near the event ho…
Particle-acceleration mechanisms in multispecies relativistic plasmas
Claudio Meringolo, Mario Imbrogno, Alejandro Cruz-Osorio +2
While collisionless plasmas are ubiquitously present near astrophysical compact objects, the impact that their composition has on the high-energy emission is presently unknown. We…
Testing black hole space-times with the S2 star orbit: a Bayesian comparison
César Navarrete, Fernando Vázquez-Chávez, Alejandro Cruz-Osorio +1
We implement a Markov Chain Monte Carlo method to obtain posterior probability distributions for the parameters of the S2 star orbit around Sagittarius A*, for seven representative…
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…
Supermassive black-hole imaging with a self-consistent electron-temperature prescription
Alejandro Cruz-Osorio, Claudio Meringolo, Christian M. Fromm +5
The recent 230 GHz observations by the Event Horizon Telescope have resolved the innermost structure of the M87 galaxy, revealing a ring-like feature consistent with thermal synchr…
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…
Measuring the properties of homogeneous turbulence in curved spacetimes
Rita Megale, Alejandro Cruz-Osorio, Giuseppe Ficarra +5
Turbulence in curved spacetimes in general, and in the vicinity of black holes (BHs) in particular, represents a poorly understood phenomenon that is often analysed employing techn…
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…
First polarization study of the M87 jet and active galactic nuclei at submillimeter wavelengths with ALMA
Ciriaco Goddi, Douglas F. Carlos
We present full-polarization observations at mm (345 GHz) conducted with the Atacama Large Millimeter/submillimeter Array (ALMA) toward Messier 87 (M87) and seven other r…
Turbulence and Magnetic Reconnection in Relativistic Multispecies Plasmas
Mario Imbrogno, Claudio Meringolo, Alejandro Cruz-Osorio +3
Simulations of relativistic plasmas traditionally focus on the dynamics of two-species mixtures of charged particles under the influence of external magnetic fields and those gener…
Shadow and gravitational lensing produced by the nonlinear accretion of a scalar field onto a black hole
J. C. Acevedo-Muñoz, F. D. Lora-Clavijo, A. Cruz-Osorio
The hypothesis that classical scalar fields could constitute dark matter on galactic and cosmic scales has garnered significant interest. In scenarios where supermassive black hole…
Modeling the shadow of Sgr A* through an eclipsing black hole
Milton Jair Santibañez-Armenta, Gustavo Magallanes-Guijón, Sergio Mendoza +1
The Event Horizon Telescope (EHT) observations of Sgr\,A* resolved the shadow image and emission ring-like structure, which is associated to the photon ring of the supermassive bla…
Black hole accretion and radiation variability in GRMHD simulations with Rezzolla-Zhidenko spacetime
Kotaro Moriyama, Alejandro Cruz-Osorio, Yosuke Mizuno +2
The Event Horizon Telescope (EHT) has revealed the horizon-scale radiation of Sagittarius A* (Sgr A*), our galaxy's central supermassive black hole, offering a new platform to test…
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…