DOI

https://doi.org/10.48717/yvkj-qe17

Project

EY038

Title

CLAGN 1ES 1927+654

Abstract

We propose EVN observation of an unusual changing-look AGN 1ES 1927+654 (z=0.017) with L, C, and X-band receivers. The source underwent a changing-look event during 2018 and was captured during a spectral transition from Seyfert Type 2 to Type 1-like features (appearance of broad Balmer lines). Considering its 'naked' nucleus, the changing look cannot be explained by the dramatic changing of the view angle, which alternatively indicates a new accretion episode in the central engine. The source has recently exhibited dramatic changes in the optical and X-ray light curves and spectra. Our previous VLBI observation revealed an outflowing jet structure, especially from the last year, the source starts to show a long-expected radio flux density increasing that is likely associated with the changing-look events. To fully understand the relationship between the multi-waveband appearance of the source, new sensitive EVN observations are needed not to miss this unique opportunity to study the newly born outflow in this particularly interesting source.