Kavli Affiliate: Ran Wang
| First 5 Authors: Xiaolong Yang, Su Yao, Luigi C. Gallo, Jun Yang, Luis C. Ho
| Summary:
Accretion of black holes at near-Eddington or super-Eddington rates is the
most powerful episode that drives black hole growth, and it may work in several
types of objects. However, the physics of accretion and jet-disc coupling in
such a state remains unclear, mainly because the associated jets are not easily
detectable due to the extremely weak emission or possibly episodic nature of
the jets. Only a few near/super-Eddington systems have demonstrated radio
activity, and it remains unclear whether there is a jet and what are their
properties, in super-Eddington active galactic nuclei (AGNs) (and ultraluminous
X-ray sources). The deficit is mainly due to the complex radio mixing between
the origins of jets and others, such as star formation activity, photo-ionized
gas, accretion disk wind, and coronal activity. In this work, we conducted
high-resolution very long baseline interferometry (VLBI) observations to
explore the jets in the highly accreting narrow-line Seyfert I system IZw1. Our
observations successfully revealed small-scale jets (with a linear size of
$sim45$ parsec) at both 1.5 and 5 GHz, based on the high radio brightness
temperature, radio morphology, and spectral index distribution. Interestingly,
the lack of a flat-spectrum radio core and knotty jet structures imply episodic
ejections in IZw1, which resemble the ejection process in Galactic X-ray
binaries that are in the canonical very high state. The high accretion rates
and jet properties in the AGN IZw1 may support the AGN/XRB analogy in the
extreme state.
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