@article{12212,
  author = {Nicolas Scepi and Mitchell Begelman and Jason Dexter},
  title = {Magnetic flux inversion in a peculiar changing look AGN},
  abstract = {We argue that the changing-look event in the active galactic nucleus 1ES 1927+654, followed by a dip of 3 orders of magnitude in the X-ray luminosity, is controlled by a change in the accretion rate and an inversion of magnetic flux in a magnetically arrested disk (MAD). Before the changing-look event, strong magnetic flux on the black hole powers X-ray emission via the Blandford-Znajek process while the UV emission is produced by a radiatively inefficient magnetized disk. An advection event, bringing flux of the opposite polarity, propagates inward leading, first, to a rise in the UV/optical luminosity and, then, to a dip in the X-ray luminosity when it reaches the black hole. We estimate the timescale for magnetic flux advection and find that the observed timescale between the beginning of the changing-look event and the minimum in the X-ray luminosity, ≈200 days, is in agreement with the time needed to cancel the magnetic flux in a MAD extending to ≈180rg. Although flux inversion events might be rare due to the large ratio of flux-to-mass that is needed, we argue that AGN showing an unusually high ratio of X-ray to UV luminosity are prime candidates for such events. We also suggest that similar events may lead to jet interruptions in radio-loud objects.},
  year = {2021},
  journal = {Monthly Notices of the Royal Astronomical Society: Letters},
  volume = {502},
  chapter = {L50},
  pages = {L50},
  month = {20203},
  url = {https://academic.oup.com/mnrasl/article/502/1/L50/6074252},
  doi = {10.1093/mnrasl/slab002},
}