Multi-wavelenght view of 3C 279 during the 2017 EHT campaign

Spinning super-massive black holes at the centers of galaxies can launch powerful magnetized jets. When these jets are oriented within a few degrees of our line of sight, they are called as blazars, active galactic nuclei that exhibit variable, non-thermal emission across the entire electromagnetic spectrum, from radio waves to gamma rays. 3C 279 is an archetypal blazar with a prominent radio jet that undergoes broadband flux density variations. In April 2017 and April 2018, the Event Horizon Telescope (EHT) observed 3C 279 with an unprecedented angular resolution of 20 micro-arcseconds. In parallel, an extensive quasi-simultaneous multi-wavelength (MWL) campaign was conducted using both ground- and space-based observatories, covering frequencies from radio wavelengths to the TeV energy range. We present here initial findings from the first EHT-MWL observational campaign, which captured a gamma-ray flaring event. A detailed analysis of the complete 2017 dataset, along with results from the 2018 campaign and their modelling, will be provided in an upcoming publication.