A compact core-jet structure in the changing-look Seyfert NGC 2617
Jun Yang (1), Zsolt Paragi (2), Robert J. Beswick (3), Wen Chen (4),, Ilse M. van Bemmel (2), Qingwen Wu (5), Tao An (6), Xiaocong Wu (6), Lulu Fan, (7) J. B. R. Oonk (8), Xiang Liu (9), Weihua Wang (10) ((1) Chalmers, University of Technology, Sweden

TL;DR
This study reveals a compact core-jet structure in the changing-look Seyfert galaxy NGC 2617 through multi-wavelength radio observations, providing insights into jet activity during accretion state changes.
Contribution
First detailed VLBI imaging of NGC 2617's core-jet structure during a changing-look event, linking radio jet features with accretion activity.
Findings
Detected a partially self-absorbed radio core with core shift.
Identified a steep-spectrum jet extending up to two parsecs.
Most changing-look AGN are sub-mJy radio sources in surveys.
Abstract
The nearby face-on spiral galaxy NGC 2617 underwent an unambiguous 'inside-out' multi-wavelength outburst in Spring 2013, and a dramatic Seyfert type change probably between 2010 and 2012, with the emergence of broad optical emission lines. To search for the jet activity associated with this variable accretion activity, we carried out multi-resolution and multi-wavelength radio observations. Using the very long baseline interferometric (VLBI) observations with the European VLBI Network (EVN) at 1.7 and 5.0 GHz, we find that NGC 2617 shows a partially synchrotron self-absorbed compact radio core with a significant core shift, and an optically thin steep-spectrum jet extending towards the north up to about two parsecs in projection. We also observed NGC 2617 with the electronic Multi-Element Remotely Linked Interferometer Network (e-MERLIN) at 1.5 and 5.5 GHz, and revisited the archival…
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