Active galactic nuclei imaging programs of the RadioAstron mission
  Imaging relativistic jets in active galactic nuclei (AGN) at angular
resolution significantly surpassing that of the ground-based VLBI at centimetre
wavelengths is one of the key science objectives of the RadioAstron space-VLBI
mission. There are three RadioAstron imaging key science programs that target
both nearby radio galaxies and blazars, with one of the programs specifically
focusing on polarimetry of the jets. The first images from these programs reach
angular resolution of a few tens of microarcseconds and reveal unprecedented
details about the jet collimation profile, magnetic field configuration, and
Kelvin-Helmholtz instabilities along the flow in some of the most studied AGN
(3C 84, BL Lac, 3C 273, S5 0836+710). Here we give an overview of the goals and
strategy of these three ongoing programs, highlight their early results, and
discuss the challenges of space-VLBI imaging.
