title: The flaring activity of blazar AO 0235+164 in 2021
abstract: Context. The blazar AO 0235+164 , located at redshift z = 0.94, has displayed interesting and repeating flaring activity in the past, with recent episodes in 2008 and 2015. In 2020, the source brightened again, starting a new flaring episode that peaked in 2021. Aims. We study the origin and properties of the 2021 flare in relation to previous studies and the historical behavior of the source, in particular the 2008 and 2015 flaring episodes. Methods. We analyzed the multiwavelength photo-polari
journal: Astronomy and Astrophysics