Related papers: The ngEHT Analysis Challenges

The Transformational Power of Frequency Phase Transfer Methods for ngEHT

(Sub) mm VLBI observations are strongly hindered by limited sensitivity, with the fast tropospheric fluctuations being the dominant culprit. We predict great benefits from applying next-generation frequency phase transfer calibration…

Instrumentation and Methods for Astrophysics · Physics 2023-02-24 María J. Rioja , Richard Dodson , Yoshiharu Asaki

Deep learning inference with the Event Horizon Telescope III. Zingularity results from the 2017 observations and predictions for future array expansions

(abridged) In the first two papers of this publication series, we present a comprehensive library of synthetic EHT observations and used this library to train and validate Bayesian neural networks for the parameter inference of accreting…

High Energy Astrophysical Phenomena · Physics 2025-06-18 M. Janssen , C. -k. Chan , J. Davelaar , M. Wielgus

Imaging the event horizon of M87* from space on different timescales

The concept of a new space very long baseline interferometry system named the Event Horizon Imager (EHI) has been proposed to dramatically improve black hole imaging and provide precise tests of the theory of general relativity. We…

High Energy Astrophysical Phenomena · Physics 2026-02-04 Anastasia Shlentsova , Freek Roelofs , Sara Issaoun , Jordy Davelaar , Heino Falcke

Tracing the hot spot motion using the next generation Event Horizon Telescope (ngEHT)

We propose to trace the dynamical motion of a shearing hot spot near the SgrA* source through a dynamical image reconstruction algorithm, StarWarps. Such a hot spot may form as the exhaust of magnetic reconnection in a current sheet near…

Astrophysics of Galaxies · Physics 2022-11-16 Razieh Emami , Paul Tiede , Sheperd S. Doeleman , Freek Roelofs , Maciek Wielgus , Lindy Blackburn , Matthew Liska , Koushik Chatterjee , Bart Ripperda , Antonio Fuentes , Avery Broderick , Lars Hernquist , Charles Alcock , Ramesh Narayan , Randall Smith , Grant Tremblay , Angelo Ricarte , He Sun , Richard Anantua , Yuri Y. Kovalev , Priyamvada Natarajan , Mark Vogelsberger

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

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 micro-as, consistent with the size and shape of the lensed…

Astrophysics of Galaxies · Physics 2019-07-08 The Event Horizon Telescope Collaboration

Expanding the Horizon of Black Hole Imaging with AtLAST

The Event Horizon Telescope (EHT) has directly resolved and imaged two supermassive black holes and opening a new window on black hole physics. However, the current array is limited to only these two brightest nearby targets. This white…

Instrumentation and Methods for Astrophysics · Physics 2026-02-05 Kazunori Akiyama , Mariafelicia De Laurentis , Ziri Younsi , Yuto Akiyama , Dominic W. Pesce , Geoffrey C. Bower , Kazuhiro Hada , Jens Kauffmann , Shoko Koyama , Kotaro Moriyama , Derek-Ward Thompson

Evaluation of South African Candidate Sites for an Expanded Event Horizon Telescope

Global expansion of the Event Horizon Telescope (EHT) will see the strategic addition of antennas at new geographical locations, transforming the sensitivity and imaging fidelity of the $\lambda \sim 1$\,mm EHT array. A possible South…

Instrumentation and Methods for Astrophysics · Physics 2024-12-11 Senkhosi Simelane , Roger Deane , Athol Kemball , Roelf Botha , Roufurd Julie , Keitumetse Molamu , Adrian Tiplady , Aletha de Witt

Evaluation of New Submillimeter VLBI Sites for the Event Horizon Telescope

The Event Horizon Telescope (EHT) is a very long baseline interferometer built to image supermassive black holes on event-horizon scales. In this paper, we investigate candidate sites for an expanded EHT array with improved imaging…

Instrumentation and Methods for Astrophysics · Physics 2021-02-17 Alexander W. Raymond , Daniel Palumbo , Scott N. Paine , Lindy Blackburn , Rodrigo Córdova Rosado , Sheperd S. Doeleman , Joseph R. Farah , Michael D. Johnson , Freek Roelofs , Remo P. J. Tilanus , Jonathan Weintroub

MeqSilhouette : A mm-VLBI observation and signal corruption simulator

The Event Horizon Telescope (EHT) aims to spatially resolve the silhouette (or shadow) of the supermassive black holes in the Galactic Centre (Sgr A$^\star$) and M87. The primary scientific objectives are to test general relativity in the…

High Energy Astrophysical Phenomena · Physics 2016-09-21 Tariq Blecher , Roger Deane , Gianni Bernardi , Oleg Smirnov

Monitoring the Morphology of M87* in 2009-2017 with the Event Horizon Telescope

The Event Horizon Telescope (EHT) has recently delivered the first resolved images of M87*, the supermassive black hole in the center of the M87 galaxy. These images were produced using 230 GHz observations performed in 2017 April.…

High Energy Astrophysical Phenomena · Physics 2020-09-25 Maciek Wielgus , Kazunori Akiyama , Lindy Blackburn , Chi-kwan Chan , Jason Dexter , Sheperd S. Doeleman , Vincent L. Fish , Sara Issaoun , Michael D. Johnson , Thomas P. Krichbaum , Ru-Sen Lu , Dominic W. Pesce , George N. Wong , Geoffrey C. Bower , Avery E. Broderick , Andrew Chael , Koushik Chatterjee , Charles F. Gammie , Boris Georgiev , Kazuhiro Hada , Laurent Loinard , Sera Markoff , Daniel P. Marrone , Richard Plambeck , Jonathan Weintroub , Matthew Dexter , David H. E. MacMahon , Melvyn Wright , the Event Horizon Telescope Collaboration

Probing plasma composition with the next generation Event Horizon Telescope (ngEHT)

We explore the plasma matter content in the innermost accretion disk/jet in M87* as relevant for an enthusiastic search for the signatures of anti-matter in the next generation of the Event Horizon Telescope (ngEHT). We model the impact of…

High Energy Astrophysical Phenomena · Physics 2022-11-15 Razieh Emami , Richard Anantua , Angelo Ricarte , Sheperd S. Doeleman , Avery Broderick , George Wong , Lindy Blackburn , Maciek Wielgus , Ramesh Narayan , Grant Tremblay , Charles Alcock , Lars Hernquist , Randall Smith , Matthew Liska , Priyamvada Natarajan , Mark Vogelsberger , Brandon Curd , Joana A. Kramer

Selective Dynamical Imaging of Interferometric Data

Recent developments in very long baseline interferometry (VLBI) have made it possible for the Event Horizon Telescope (EHT) to resolve the innermost accretion flows of the largest supermassive black holes on the sky. The sparse nature of…

Instrumentation and Methods for Astrophysics · Physics 2024-09-16 Joseph Farah , Peter Galison , Kazunori Akiyama , Katherine L. Bouman , Geoffrey C. Bower , Andrew Chael , Antonio Fuentes , José L. Gómez , Mareki Honma , Michael D. Johnson , Yutaro Kofuji , Daniel P. Marrone , Kotaro Moriyama , Ramesh Narayan , Dominic W. Pesce , Paul Tiede , Maciek Wielgus , Guang-Yao Zhao , The Event Horizon Telescope Collaboration

Constraints on Black Hole Jet Models Used As Diagnostic Tools of Event Horizon Telescope Observations of M87

Jet models of Event Horizon Telescope (EHT) data should also conform to the observed jet profiles just downstream. This study evaluates conformance of models of black hole jets to images of the innermost jet of M87. This is a basic test…

Astrophysics of Galaxies · Physics 2019-07-10 Brian Punsly

Broadband Multi-wavelength Properties of M87 during the 2018 EHT Campaign including a Very High Energy Flaring Episode

The nearby elliptical galaxy M87 contains one of the only two supermassive black holes whose emission surrounding the event horizon has been imaged by the Event Horizon Telescope (EHT). In 2018, more than two dozen multi-wavelength (MWL)…

High Energy Astrophysical Phenomena · Physics 2024-12-19 J. C. Algaba , M. Balokovic , S. Chandra , W. Y. Cheong , Y. Z. Cui , F. D'Ammando , A. D. Falcone , N. M. Ford , M. Giroletti , C. Goddi , M. A. Gurwell , K. Hada , D. Haggard , S. Jorstad , A. Kaur , T. Kawashima , S. Kerby , J. Y. Kim , M. Kino , E. V. Kravchenko , S. S. Lee , R. S. Lu , S. Markoff , J. Michail , J. Neilsen , M. A. Nowak , G. Principe , V. Ramakrishnan , B. Ripperda , M. Sasada , S. S. Savchenko , C. Sheridan , K. Akiyama , A. Alberdi , W. Alef , R. Anantua , K. Asada , R. Azulay , U. Bach , A. -K. Baczko , D. Ball , B. Bandyopadhyay , J. Barrett , M. Bauböck , B. A. Benson , D. Bintley , L. Blackburn , R. Blundell , K. L. Bouman , G. C. Bower , H. Boyce , M. Bremer , R. Brissenden , S. Britzen , A. E. Broderick , D. Broguiere , T. Bronzwaer , S. Bustamante , J. E. Carlstrom , A. Chael , C. -K. Chan , D. O. Chang , K. Chatterjee , S. Chatterjee , M. -T. Chen , Y. Chen , X. Cheng , I. Cho , P. Christian , N. S. Conroy , J. E. Conway , T. M. Crawford , G. B. Crew , A. Cruz-Osorio , R. Dahale , J. Davelaar , M. De Laurentis , R. Deane , J. Dempsey , G. Desvignes , J. Dexter , V. Dhruv , I. K. Dihingia , S. S. Doeleman , S. A. Dzib , R. P. Eatough , R. Emami , H. Falcke , J. Farah , V. L. Fish , E. Fomalont , H. A. Ford , M. Foschi , R. Fraga-Encinas , W. T. Freeman , P. Friberg , C. M. Fromm , A. Fuentes , P. Galison , C. F. Gammie , R. García , O. Gentaz , B. Georgiev , R. Gold , A. I. Gómez-Ruiz , J. L. Gómez , M. Gu , R. Hesper , D. Heumann , L. C. Ho , P. Ho , M. Honma , C. -W. L. Huang , L. Huang , D. H. Hughes , S. Ikeda , C. M. V. Impellizzeri , M. Inoue , S. Issaoun , D. J. James , B. T. Jannuzi , M. Janssen , B. Jeter , W. Jiang , A. Jiménez-Rosales , M. D. Johnson , A. C. Jones , A. V. Joshi , T. Jung , R. Karuppusamy , G. K. Keating , M. Kettenis , D. -J. Kim , J. Kim , J. Kim , J. Y. Koay , P. Kocherlakota , Y. Kofuji , P. M. Koch , S. Koyama , C. Kramer , J. A. Kramer , M. 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Romero-Cañizales , E. Ros , A. Roshanineshat , H. Rottmann , A. L. Roy , I. Ruiz , C. Ruszczyk , K. L. J. Rygl , S. Sánchez , D. Sánchez-Argüelles , M. Sánchez-Portal , K. Satapathy , T. Savolainen , F. P. Schloerb , J. Schonfeld , K. -F. Schuster , L. Shao , Z. Shen , D. Small , B. W. Sohn , J. SooHoo , L. D. Sosapanta Salas , K. Souccar , J. S. Stanway , H. Sun , F. Tazaki , A. J. Tetarenko , P. Tiede , R. P. J. Tilanus , M. Titus , K. Toma , P. Torne , T. Toscano , E. Traianou , T. Trent , S. Trippe , M. Turk , I. van Bemmel , H. J. van Langevelde , D. R. van Rossum , J. Vos , J. Wagner , D. Ward-Thompson , J. Wardle , J. E. Washington , J. Weintroub , R. Wharton , M. Wielgus , K. Wiik , G. Witzel , M. F. Wondrak , G. N. Wong , Q. Wu , N. Yadlapalli , P. Yamaguchi , A. Yfantis , D. Yoon , A. Young , Z. Younsi , W. Yu , F. Yuan , Y. -F. Yuan , J. A. Zensus , S. Zhang , G. -Y. Zhao , S. -S. Zhao , R. Bellazzini , B. Berenji , E. Bissaldi , R. D. Blandford , R. Bonino , P. Bruel , R. A. Cameron , P. A. Caraveo , E. Cavazzuti , C. C. Cheung , S. Ciprini , P. Cristarella Orestano , S. Cutini , N. Di Lalla , A. Dinesh , L. Di Venere , A. Domínguez , S. J. Fegan , A. Franckowiak , Y. Fukazawa , P. Fusco , F. Gargano , C. Gasbarra , S. Germani , M. Giliberti , I. A. Grenier , E. Hays , D. Horan , M. Kuss , S. Larsson , I. Liodakis , F. Longo , F. Loparco , M. N. Lovellette , S. Maldera , M. N. Mazziotta , I. Mereu , P. F. Michelson , N. Mirabal , T. Mizuno , M. E. Monzani , A. Morselli , M. Negro , N. Omodei , E. Orlando , M. Persic , S. Rainò , B. Rani , A. Reimer , O. Reimer , M. Sánchez-Conde , P. M. Saz Parkinson , C. Sgrò , E. J. Siskind , P. Spinelli , D. J. Suson , H. Tajima , D. F. Torres , G. Zaharijas , F. Aharonian , F. Ait Benkhali , J. Aschersleben , H. Ashkar , M. Backes , V. Barbosa Martins , R. Batzofin , Y. Becherini , D. Berge , M. Böttcher , C. Boisson , J. Bolmont , M. de Bony de Lavergne , J. Borowska , M. Bouyahiaoui , F. Bradascio , R. Brose , A. Brown , B. Bruno , T. Bulik , C. Burger-Scheidlin , S. Casanova , R. Cecil , J. Celic , M. Cerruti , T. Chand , A. Chen , J. Chibueze , O. Chibueze , T. Czerny , M. Dainotti , F. Dubus , J. Dumm , G. D'Urso , A. Drouhin , P. Durouchoux , D. Fabbian , D. Franczak , M. Funk , J. Gabanyi , G. Gaggero , N. Garcia , A. Geiger , M. G. Giorgi , S. Gleeson , S. Gonzalez , G. T. Gauthier , P. Grasso , T. Hovatta , J. Hyman , C. Kaaret , D. Kirk , S. Lal , T. M. Lesch , K. Lohmann , C. Massaro , M. Mayer , P. J. Meintjes , E. Miral , A. Mirra , J. Neronov , E. Padovani , F. Paccagnella , E. Parisi , A. Piotrowska , S. Pohl , G. Puga , L. R. Ramirez , S. Reville , D. S. Rowell , M. Rudge , G. Rybka , M. S. Schlenstedt , E. S. Seo , J. Svirski , J. R. Taylor , F. Torres , K. Tsujimoto , F. Tosti , S. Volpi , N. A. Walraven , L. Welker , M. Zietkiewicz , G. Abdalla , C. Aleva , H. A. Ait Benkhali , M. Aldous , M. Amin , M. A. Aschieri , E. de Deus , J. de Los Santos , D. Fontanot , S. Jorfi , P. Levens , A. E. E. Zwart , S. Oliviero , D. Puglisi , M. Thiel , C. Zaharijas , F. Amaral , L. Boella , L. Holincheck , R. Queiroz , H. Sofue , G. Tellis , G. Wagner , A. Wierzcholska , M. Zacharias , A. A. Zdziarski , A. Zech , N. Zywucka , S. Abe , J. Abhir , A. Abhishek , V. A. Acciari , A. Aguasca-Cabot , I. Agudo , T. Aniello , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , C. Arcaro , M. Artero , K. Asano , A. Babic , U. Barres de Almeida , J. A. Barrio , I. Batkovic , A. Bautista , J. Baxter , J. Becerra González , W. Bednarek , E. Bernardini , J. Bernete , A. Berti , J. Besenrieder , C. Bigongiari , A. Biland , O. Blanch , G. Bonnoli , Z. Bosnjak , E. Bronzini , I. Burelli , G. Busetto , A. Campoy-Ordaz , A. Carosi , R. Carosi , M. Carretero-Castrillo , A. J. Castro-Tirado , D. Cerasole , G. Ceribella , Y. Chai , A. Cifuentes , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , G. D'Amico , V. D'Elia , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , R. de Menezes , M. Delfino , J. Delgado , C. Delgado Mendez , F. Di Pierro , R. Di Tria , L. Di Venere , D. Dominis Prester , A. Donini , D. Dorner , M. Doro , D. Elsaesser , J. Escudero , L. Fariña , A. Fattorini , L. Foffano , L. Font , S. Fröse , S. Fukami , Y. Fukazawa , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , J. G. Giesbrecht Paiva , N. Giglietto , F. Giordano , P. Gliwny , N. Godinovic , T. Gradetzke , R. Grau , D. Green , J. G. Green , P. Günther , D. Hadasch , A. Hahn , T. Hassan , L. Heckmann , J. Herrera Llorente , D. Hrupec , R. Imazawa , K. Ishio , I. Jiménez Martínez , J. Jormanainen , T. Kayanoki , D. Kerszberg , G. W. Kluge , Y. Kobayashi , P. M. Kouch , H. Kubo , J. Kushida , M. Laínez , A. Lamastra , F. Leone , E. Lindfors , S. Lombardi , R. López-Coto , M. López-Moya , A. López-Oramas , S. Loporchio , A. Lorini , E. Lyard , B. Machado de Oliveira Fraga , P. Majumdar , M. Makariev , G. Maneva , M. Manganaro , S. Mangano , K. Mannheim , M. Mariotti , M. Martínez , M. Martínez-Chicharro , A. Mas-Aguilar , D. Mazin , S. Menchiari , S. Mender , D. Miceli , T. Miener , J. M. Miranda , R. Mirzoyan , M. Molero González , E. Molina , H. A. Mondal , A. Moralejo , D. Morcuende , T. Nakamori , C. Nanci , V. Neustroev , L. Nickel , M. Nievas Rosillo , C. Nigro , L. Nikolic , K. Nilsson , K. Nishijima , T. Njoh Ekoume , K. Noda , S. Nozaki , Y. Ohtani , A. Okumura , J. Otero-Santos , S. Paiano , D. Paneque , R. Paoletti , J. M. Paredes , M. Peresano , M. Persic , M. Pihet , G. Pirola , F. Podobnik , P. G. Prada Moroni , E. Prandini , C. Priyadarshi , M. Ribó , J. Rico , C. Righi , N. Sahakyan , T. Saito , F. G. Saturni , K. Schmidt , F. Schmuckermaier , J. L. Schubert , T. Schweizer , A. Sciaccaluga , G. Silvestri , J. Sitarek , V. Sliusar , D. Sobczynska , A. Spolon , A. Stamerra , J. Strišković , D. Strom , M. Strzys , Y. Suda , S. Suutarinen , H. Tajima , M. Takahashi , R. Takeishi , F. Tavecchio , P. Temnikov , K. Terauchi , T. Terzic , M. Teshima , S. Truzzi , A. Tutone , S. Ubach , J. van Scherpenberg , M. Vazquez Acosta , S. Ventura , G. Verna , I. Viale , C. F. Vigorito , V. Vitale , I. Vovk , R. Walter , M. Will , C. Wunderlich , T. Yamamoto , A. Acharyya , C. B. Adams , P. Bangale , J. T. Bartkoske , W. Benbow , J. L. Christiansen , A. Duerr , M. Errando , Q. Feng , G. M. Foote , L. Fortson , A. Furniss , W. Hanlon , O. Hervet , C. E. Hinrichs , J. Holder , T. B. Humensky , W. Jin , M. N. Johnson , P. Kaaret , M. Kertzman , D. Kieda , T. K. Kleiner , N. Korzoun , F. Krennrich , S. Kumar , M. J. Lang , M. Lundy , G. Maier , C. E. McGrath , M. J. Millard , C. L. Mooney , P. Moriarty , R. Mukherjee , W. Ning , S. O'Brien , R. A. Ong , M. Pohl , E. Pueschel , J. Quinn , K. Ragan , P. T. Reynolds , D. Ribeiro , E. Roache , J. L. Ryan , I. Sadeh , L. Saha , M. Santander , G. H. Sembroski , R. Shang , M. Splettstoesser , A. K. Talluri , J. V. Tucci , J. Valverde , V. V. Vassiliev , D. A. Williams , S. L. Wong , Z. Chen , L. Cui , T. Hirota , B. Li , G. Li , Q. Liu , X. Liu , Z. Liu , J. Ma , K. Niinuma , H. Ro , N. Sakai , S. Sawada-Satoh , K. Wajima , J. Wang , N. Wang , B. Xia , H. Yan , Y. Yonekura , H. Zhang , R. Zhao , W. Zhong , The Event Horizon Telescope - Multi-wavelength science working group , The Event Horizon Telescope Collaboration , The Fermi Large Area Telescope Collaboration , H. E. S. S. Collaboration , MAGIC Collaboration , VERITAS Collaboration , EAVN Collaboration

Imaging the ring and jet in M87 at 85 GHz with the ngEHT and ngEHT+ngVL

The Global mm-VLBI Array (GMVA) has demonstrated the ability to resolved what may be the general relativistic shadow of the supermassive black hole in M87 at 86 GHz, as well as delineate the inner jet to $\sim 1$~mas distance. We…

High Energy Astrophysical Phenomena · Physics 2023-09-26 C. L. Carilli , R. C. Walker , E. Murphy , B. Mason

Probing neutrino production in blazars by millimeter VLBI

The advancement of neutrino observatories has sparked a surge in multi-messenger astronomy. Multiple neutrino associations among blazars are reported while neutrino production site is located within their central (sub)parsecs. Yet many…

High Energy Astrophysical Phenomena · Physics 2023-07-11 Y. Y. Kovalev , A. V. Plavin , A. B. Pushkarev , S. V. Troitsky

Imaging the Supermassive Black Hole Shadow and Jet Base of M87 with the Event Horizon Telescope

The Event Horizon Telescope (EHT) is a project to assemble a Very Long Baseline Interferometry (VLBI) network of mm wavelength dishes that can resolve strong field General Relativistic signatures near a supermassive black hole. As planned,…

Instrumentation and Methods for Astrophysics · Physics 2015-06-19 Ru-Sen Lu , Avery E. Broderick , Fabien Baron , John D. Monnier , Vincent L. Fish , Sheperd S. Doeleman , Victor Pankratius

Black hole parameter estimation with synthetic Very Long Baseline Interferometry data from the ground and from space

The Event Horizon Telescope (EHT) has imaged the shadow of the supermassive black hole in M87. A library of general relativistic magnetohydrodynamics (GMRHD) models was fit to the observational data, providing constraints on black hole…

High Energy Astrophysical Phenomena · Physics 2021-06-09 Freek Roelofs , Christian M. Fromm , Yosuke Mizuno , Jordy Davelaar , Michael Janssen , Ziri Younsi , Luciano Rezzolla , Heino Falcke

Bayesian techniques for comparing time-dependent GRMHD simulations to variable Event Horizon Telescope observations

The Event Horizon Telescope (EHT) is a millimeter-wavelength, very-long-baseline interferometry (VLBI) experiment that is capable of observing black holes with horizon-scale resolution. Early observations have revealed variable…

High Energy Astrophysical Phenomena · Physics 2016-12-20 Junhan Kim , Daniel P. Marrone , Chi-kwan Chan , Lia Medeiros , Feryal Özel , Dimitrios Psaltis

First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole

In this paper, we provide a first physical interpretation for the Event Horizon Telescope (EHT)'s 2017 observations of Sgr A*. Our main approach is to compare resolved EHT data at 230 GHz and unresolved non-EHT observations from radio to…

High Energy Astrophysical Phenomena · Physics 2023-11-17 The Event Horizon Telescope Collaboration