articleThe Astrophysical Journal LettersMay 1, 2022GOLD OA

First Sagittarius A* Event Horizon Telescope Results. II. EHT and Multiwavelength Observations, Data Processing, and Calibration

KAKazunori AkiyamaAAA. AlberdiWAW. AlefJCJuan Carlos AlgabaRARichard Anantua

Woodwell Climate Research Center · Harvard University · +133 more institutions

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Abstract

Abstract We present Event Horizon Telescope (EHT) 1.3 mm measurements of the radio source located at the position of the supermassive black hole Sagittarius A* (Sgr A*), collected during the 2017 April 5–11 campaign. The observations were carried out with eight facilities at six locations across the globe. Novel calibration methods are employed to account for Sgr A*'s flux variability. The majority of the 1.3 mm emission arises from horizon scales, where intrinsic structural source variability is detected on timescales of minutes to hours. The effects of interstellar scattering on the image and its variability are found to be subdominant to intrinsic source structure. The calibrated visibility amplitudes,…

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Topics & keywords

Topics
Keywords
  • Telescope
  • Sagittarius
  • Calibration
  • Event (particle physics)
  • Astronomy
  • Physics
  • Horizon
  • Sagittarius A*
UN Sustainable Development Goals
  • Affordable and clean energy
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