Landing page for project RSG13

One of the major unsolved questions concerning the understanding of the active galactic nucleus (AGN) population is the origin of the dichotomy between radio-quiet and radio-loud AGNs. The accretion flow and its associated jet should be completely determined by the fundamental parameters of the supermassive black hole (SMBH), its mass and spin, and the mass accretion rate onto the black hole. Collected so far observational results suggest that radio-quiet/radio-loud AGN dichotomy could be explained at least partially by accretion flow properties. Here we propose a short e-VLBI observations of SDSS J142746.39+293038.2, an AGN classified as Seyfert I object, that recently has undergone a slow, significant optical flare with the amplitude ~2m (Gaia19axp - AT 2019brs). Our spectroscopic follow-up shows the transition in the accretion mode and significant increase of the accretion disc temperature. We would like to check if there is any sign of radio activity that could be connected with the Gaia19axp event. The putative detection could be important step forward in our understanding of the origin of the radio-quiet/radio-loud AGN dichotomy.

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