Landing page for project ES112

Recent optical and mid-infrared time-domain surveys have led to the discovery of a rare but extremely interesting class transients dubbed as "turn-on" AGNs, which have changed from quasi-quiescent galaxies/LINERs to broad-line AGNs within months to years. Such a rapid state transformation with dramatic changes in accretion rate provides the unique laboratory to explore the ignition mechanism of accretion onto supermassive black holes, and possibly the mystery of jet formation in AGNs. Despite extensive searches, only few bona fide "turn-on" AGNs have been reported so far. We have used GMRT/VLA/EVN to follow-up a candidate "turn-on" AGN with transient radio emission, and found unusual radio flux and spectral evolution, characterized by more than one synchrotron emission components. Two-epoch EVN observations detected a tentative proper motion of radio emission perhaps from an off-axis jet, but the significance is not high. We request new EVN observations at the same band as previous ones, with the immediate aim to corroborate the proper motion of jet, by extending the monitoring baseline to three years. If confirmed, it would be the first detection of a resolved radio jet in a unique "turn-on" AGN.

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