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SUMMARY:Results from RadioAstron Nearby AGN Key Science Program
DTSTART;VALUE=DATE-TIME:20171213T083000Z
DTEND;VALUE=DATE-TIME:20171213T090000Z
DTSTAMP;VALUE=DATE-TIME:20260414T143631Z
UID:indico-contribution-18@cern.ch
DESCRIPTION:Speakers: Dr. SAVOLAINEN\, Tuomas (Aalto Univ & MPI für Radio
 astronomie)\nNear-perigee imaging observations of nearby radio galaxies wi
 th RadioAstron space-VLBI telescope allow us to probe the jet formation re
 gion of AGN at unprecedented resolution. RadioAstron images of radio galax
 y 3C84 at the center of the Perseus cluster have revealed a strong collima
 tion of its edge-brightened jet at  300 to 400 Schwarzschild radii (r_s)  
 from the black hole and an almost cylindrical collimation profile up to ab
 out 8000 r_s. This differs markedly from the parabolic collimation profile
  of M87 and is likely due to confinement by external medium with a very sh
 allow pressure profile. The jet power in 3C84 has significantly increased 
 since the early 2000s\, and this "re-started" jet is apparently pushing th
 rough a rather dense external medium\, which is manifested by a sub-lumina
 lly moving head of the jet at about 1 parsec from the core. The 5GHz Radio
 Astron image shows a low-intensity emission region surrounding the re-star
 ted jet and this is perhaps the first evidence for a "mini-cocoon" structu
 re in parsec scales. Another nearby radio galaxy that has been successfull
 y imaged with RadioAstron is M87. The 1.6GHz image shows for the first tim
 e a detailed internal structure of the acceleration and collimation zone i
 n an AGN jet with a multi-layered structure together with helical threads 
 inside the jet. This provides an important observational comparison case f
 or the simulations of black hole jets.\n\nhttps://events.mpifr-bonn.mpg.de
 /indico/event/61/session/0/contribution/18
LOCATION:MPI für Radioastronomie 2.05
URL:https://events.mpifr-bonn.mpg.de/indico/event/61/session/0/contributio
 n/18
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