0000000000373929

AUTHOR

William T. Freeman

showing 3 related works from this author

First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole

2019

We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ~40 μas, consistent with the size and shape of the lensed photon orbit encircling the "shadow" of a supermassive black hole. The ring is persistent across four observing nights and shows enhanced brightness in the south. To assess the reliability of these results, we implemented a two-stage imaging procedure. In the first stage, four teams, each blind to the others' work, produced images of M87 using both an established method (CLEAN) and a newer technique (regularized maximum likelihood). This stage allowed us to av…

Brightness010504 meteorology & atmospheric sciencesgalaxies: jetAstronomyblack hole physicsFOS: Physical sciencesgalaxies: individualtechniques: image processingAstrophysicsGeneral Relativity and Quantum Cosmology (gr-qc)galaxies: individual: M8701 natural sciencesSynthetic dataGeneral Relativity and Quantum Cosmologygalaxies: individual (M87)0103 physical sciencesimage processing [Techniques]010303 astronomy & astrophysicsInstrumentation and Methods for Astrophysics (astro-ph.IM)0105 earth and related environmental sciencesEvent Horizon TelescopePhysicsGround truthSupermassive black holetechniques: high angular resolutionAstronomy and AstrophysicsBlack hole physicsgalaxies: jetsindividual (M87) [Galaxies]Astrophysics - Astrophysics of Galaxiesblack hole physic3. Good healthOrbitInterferometryhigh angular resolution [Techniques]Space and Planetary Sciencetechniques: interferometricAstrophysics of Galaxies (astro-ph.GA)interferometric [Techniques]jets [Galaxies]Deconvolution[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]Astrophysics - Instrumentation and Methods for Astrophysics
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First M87 Event Horizon Telescope Results. VII. Polarization of the Ring

2021

Full list of authors: Akiyama, Kazunori; Algaba, Juan Carlos; Alberdi, Antxon; Alef, Walter; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, John; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwaer, Thomas; Byun, Do-Young; Carlstrom, John E.; Chael, Andrew; Chan, Chi-kwan; Chatterjee, Shami; Chatterjee, Koushik; Chen, Ming-Tang; Chen, Yongjun; Chesler, Paul M.; Cho, Ilje; Christian, Pierre; Conway, John E.…

1663010504 meteorology & atmospheric sciences1346KinoAstrophysics - astrophysics of galaxiesAstronomyAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesGalaxy accretion disks01 natural sciencesAstrophysics - high energy astrophysical phenomena2033Galaxies: individual: M87 1278 1346 1769 1663 16 2033 1859 5620103 physical sciencesPolarimetrySupermassive black holes1769010303 astronomy & astrophysicsAstronomy data modeling0105 earth and related environmental sciencesVery long baseline interferometryPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Active galactic nucleiGalaxies: individual: M871278F510ChatterjeeAstronomy and AstrophysicsCreative commons16562Low-luminosity active galactic nuclei13. Climate actionSpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)Fish <Actinopterygii>Radio interferometryHumanities1859
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First M87 Event Horizon Telescope Results. I. the Shadow of the Supermassive Black Hole

2019

When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon. To image and study this phenomenon, we have assembled the Event Horizon Telescope, a global very long baseline interferometry array observing at a wavelength of 1.3 mm. This allows us to reconstruct event-horizon-scale images of the supermassive black hole candidate in the center of the giant elliptical galaxy M87. We have resolved the central compact radio source as an asymmetric bright emission ring with a diameter of 42 ± 3 μas, which is circular and encompasses a central depression in brightness with a flux rati…

010504 meteorology & atmospheric sciencesindividual (M87) [galaxies]Event horizonAstronomyblack hole physicsjets [galaxies]galaxies: individualAstrophysicshigh-resolution7. Clean energy01 natural sciencesPhoton sphereGeneral Relativity and Quantum Cosmologyaccretionsagittarius-a-asterisk010303 astronomy & astrophysicsgalactic-centerHigh Energy Astrophysical Phenomena (astro-ph.HE)Physicsradio-sourcesaccretion disksGalactic Centergrmhd simulations3. Good healthenergy-distributionsactive [galaxies]AnatomyAstrophysics - High Energy Astrophysical PhenomenaActive galactic nucleusAstrophysics::High Energy Astrophysical Phenomenagalaxies: activeFOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic Astrophysicsgalaxies: individual: M87galaxies: individual (M87)Cell and Developmental BiologyGeneral Relativity and Quantum Cosmology0103 physical sciences(M87)Astrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesEvent Horizon TelescopeSupermassive black holeghz vlbi observationsfaraday-rotationAstronomy and Astrophysicsgalaxies: jetsAstrophysics - Astrophysics of GalaxiesBlack holeRotating black holeSpace and Planetary SciencegravitationAstrophysics of Galaxies (astro-ph.GA)advection-dominated accretion[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]ionized-gas
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