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Accretion of black holes at near-Eddington or super-Eddington rates is themost powerful episode that drives black hole growth, and it may work in severaltypes of objects. However, the physics of accretion and jet-disc coupling insuch a state remains unclear, mainly because the associated jets are not easilydetectable due to the extremely weak emission or possibly episodic nature ofthe jets. Only a few near/super-Eddington systems have demonstrated radioactivity, and it remains unclear whether there is a jet and what are theirproperties, in super-Eddington active galactic nuclei (AGNs) (and ultraluminousX-ray sources). The deficit is mainly due to the complex radio mixing betweenthe origins of jets and others, such as star formation activity, photo-ionizedgas, accretion disk wind, and coronal activity. In this work, we conductedhigh-resolution very long baseline interferometry (VLBI) observations toexplore the jets in the highly accreting narrow-line Seyfert I system IZw1. Ourobservations successfully revealed small-scale jets (with a linear size of$\sim45$ parsec) at both 1.5 and 5 GHz, based on the high radio brightnesstemperature, radio morphology, and spectral index distribution. Interestingly,the lack of a flat-spectrum radio core and knotty jet structures imply episodicejections in IZw1, which resemble the ejection process in Galactic X-raybinaries that are in the canonical very high state. The high accretion ratesand jet properties in the AGN IZw1 may support the AGN/XRB analogy in theextreme state.

Unveiling the small-scale jets in the rapidly growing supermassive black hole IZw1