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First M87 Event Horizon Telescope Results. II. Array and Instrumentation

2019

The Event Horizon Telescope (EHT) is a very long baseline interferometry (VLBI) array that comprises millimeter- and submillimeter-wavelength telescopes separated by distances comparable to the diameter of the Earth. At a nominal operating wavelength of ~1.3 mm, EHT angular resolution (λ/D) is ~25 μas, which is sufficient to resolve nearby supermassive black hole candidates on spatial and temporal scales that correspond to their event horizons. With this capability, the EHT scientific goals are to probe general relativistic effects in the strong-field regime and to study accretion and relativistic jet formation near the black hole boundary. In this Letter we describe the system design of th…

010504 meteorology & atmospheric sciencesindividual (M87) [galaxies]Event horizonAstronomyAstrophysics::High Energy Astrophysical Phenomenainterferometers [instrumentation]black hole physicsFOS: Physical sciencesgalaxies: individualGeneral Relativity and Quantum Cosmology (gr-qc)galaxies: individual: M8701 natural sciencesGeneral Relativity and Quantum Cosmologygalaxies: individual (M87)instrumentation: interferometer0103 physical sciencesVery-long-baseline interferometryAngular resolutionInstrumentation (computer programming)instrumentation: interferometers010303 astronomy & astrophysicsInstrumentation and Methods for Astrophysics (astro-ph.IM)Astrophysics::Galaxy Astrophysics0105 earth and related environmental scienceshigh angular resolution [echniques]Event Horizon TelescopePhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Supermassive black holeGalaxy: centerhigh angular resolution [techniques]Astronomytechniques: high angular resolutiongravitational lensing: strongAstronomy and Astrophysicscenter [Galaxy]Hydrogen maserblack hole physicAstrophysics - Astrophysics of Galaxiesechniques: high angular resolutionSpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)strong [gravitational lensing]MillimeterAstrophysics - Instrumentation and Methods for AstrophysicsAstrophysics - High Energy Astrophysical Phenomena[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]The Astrophysical Journal Letters
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