Landing page for project EB106

The formerly type-II AGN 1ES 1927+654 is widely considered one of the most unusual and extreme CL-AGN yet discovered, exhibiting an extreme 4 magnitude flare in the optical in late 2017 concurrent with the first-ever appearance of broad emission lines. Multi-wavelength monitoring since the event has shown strong variability in the soft X-rays corresponding to the twice-repeated destruction and reappearance of the X-ray corona. Ongoing X-ray monitoring now shows that the soft X-ray flux is again rising and a very recent VLBA observation on 27 April shows an unprecedented factor-of-20 increase in the VLBA radio flux to match the X-rays. We have then started a daily VLA+Swift+NICER campaign of 1ES 1927 since 20th May 2022. The daily VLA C-band observations have shown that the source radio flux jumped to 30 mJy in April, and to 60 mJy on 20th May. On 21st May it went down slightly to 54 mJy, but again it raised to 61 mJy on 22nd May. We propose here a multi-epoch campaign with the EVN to spot the onset of a newborn jet.

This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197