Image Details
Caption: Figure 1.
EHT images of M87* on 2017 April 11 (EHTC M87 I, left), 2018 April 21 (EHTC M87 2018 I, middle), and 2021 April 18 (EHTC M87 2021, right). All images show a brightness asymmetry with a peak magnitude in the south. The asymmetry magnitude a1 and angle PA1 measured in this work are shown.
© 2026. The Author(s). Published by the American Astronomical Society.