The ngEHT Analysis Challenges

The next-generation Event Horizon Telescope (ngEHT) will be a significant enhancement of the Event Horizon Telescope (EHT) array, with ∼10 new antennas and instrumental upgrades of existing antennas. The increased -coverage, sensitivity, and frequency coverage allow a wide range of new science oppor...

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Detalles Bibliográficos
Autores: Roelofs, Freek, Blackburn, Lindy, Lindahl, Greg, Doeleman, Sheperd S., Johnson, Michael D., Arras, Philipp, Chatterjee, Koushik, Emami, Razieh, Fromm, Christian, Fuentes, Antonio, Knollmüller, Jakob, Kosogorov, Nikita, Müller, Hendrik, Patel, Nimesh, Raymond, Alexander W., Tiede, Paul, Traianou, E., Vega, Justin
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/309769
Acceso en línea:http://hdl.handle.net/10261/309769
Access Level:acceso abierto
Palabra clave:Very long baseline interferometry
Black holes
Active galactic nuclei
Radio astronomy
Imaging
Instrument design
Telescopes
Algorithms
Data analysis
Descripción
Sumario:The next-generation Event Horizon Telescope (ngEHT) will be a significant enhancement of the Event Horizon Telescope (EHT) array, with ∼10 new antennas and instrumental upgrades of existing antennas. The increased -coverage, sensitivity, and frequency coverage allow a wide range of new science opportunities to be explored. The ngEHT Analysis Challenges have been launched to inform the development of the ngEHT array design, science objectives, and analysis pathways. For each challenge, synthetic EHT and ngEHT datasets are generated from theoretical source models and released to the challenge participants, who analyze the datasets using image reconstruction and other methods. The submitted analysis results are evaluated with quantitative metrics. In this work, we report on the first two ngEHT Analysis Challenges. These have focused on static and dynamical models of M87* and Sgr A* and shown that high-quality movies of the extended jet structure of M87* and near-horizon hourly timescale variability of Sgr A* can be reconstructed by the reference ngEHT array in realistic observing conditions using current analysis algorithms. We identify areas where there is still room for improvement of these algorithms and analysis strategies. Other science cases and arrays will be explored in future challenges. © 2023 by the authors. Licensee MDPI, Basel, Switzerland.

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