Oh, JunghwanJunghwanOhHodgson, Jeffrey A.Jeffrey A.HodgsonTrippe, SaschaSaschaTrippeKrichbaum, Thomas P.Thomas P.KrichbaumKam, MinchulMinchulKamParaschos, Georgios FilipposGeorgios FilipposParaschosKim, Jae-YoungJae-YoungKimRani, BinduBinduRaniSohn, Bong WonBong WonSohnLee, Sang-SungSang-SungLeeLICO, RoccoRoccoLICOLIUZZO, Elisabetta TeodorinaElisabetta TeodorinaLIUZZOBremer, MichaelMichaelBremerZensus, AntonAntonZensus2022-03-242022-03-2420220035-8711http://hdl.handle.net/20.500.12386/318383C 84 (NGC 1275) is the radio source at the centre of the Perseus cluster and exhibits a bright radio jet. We observed the source with the Global Millimeter VLBI Array (GMVA) between 2008 and 2015, with a typical angular resolution of ~50 $\mu$as. The observations revealed a consistent double nuclear structure separated by ~770 gravitational radii assuming a black hole mass of 3.2 × 10<SUP>8</SUP> M<SUB>⊙</SUB>. The region is likely too broad and bright to be the true jet base anchored in the accretion disc or black hole ergosphere. A cone and parabola were fit to the stacked (time averaged) image of the nuclear region. The data did not strongly prefer either fit, but combined with a jet/counter-jet ratio analysis, an upper limit on the viewing angle to the inner jet region of ≤35° was found. This provides evidence for a variation of the viewing angle along the jet (and therefore a bent jet) within ~0.5 pc of the jet launching region. In the case of a conical jet, the apex is located ~2400 gravitational radii upstream of the bright nuclear region and up to ~600 gravitational radii upstream in the parabolic case. We found a possible correlation between the brightness temperature and relative position angle of the double nuclear components, which may indicate rotation within the jet.STAMPAenArticle10.1093/mnras/stab30562-s2.0-85121241237https://academic.oup.com/mnras/article/509/1/1024/6412543?login=truehttp://arxiv.org/abs/2110.09811v12022MNRAS.509.1024OFIS/05 - ASTRONOMIA E ASTROFISICA