| Description: | Recent results of the GRAVITY team on SgrA* and the Event Horizon Telescope on M87 put stringent constraints on the nature of the central object. However, there is still room for models alternative to a black hole. One possibility to search for alternative models is to discover magnetic fields in excess of 10 000 G in the vicinity of the central object. These fields are predicted to be generated by a variety of horizonless objects.
In this talk, we discuss the results on NRAO530, which was used as a calibrator for M87 observations by the EHT but appeared to be more than merely a boring calibrator. I will show our estimates on the magnetic field at the distance of the event horizon as well as around the jet. I will also touch on the precession and a set of the re-collimation shocks found downstream.
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