Unveiling the Small-scale Jets in the Rapidly Growing Supermassive Black Hole IZw1
Artikel i vetenskaplig tidskrift, 2024

Accretion of black holes at near-Eddington or super-Eddington rates represents the most powerful episode driving black hole growth, potentially occurring across various types of objects. However, the physics governing accretion and jet-disk coupling in such states remains unclear, primarily due to the difficulty in detecting associated jets, which may emit extremely weakly or exhibit episodic behavior. Only a few near/super-Eddington systems have demonstrated radio activity, and it remains uncertain whether jets exist and what their properties are in super-Eddington active galactic nuclei (AGNs) and ultraluminous X-ray sources. This uncertainty stems mainly from the complex radio emission mix, which includes contributions from jets, star formation activity, photoionized gas, accretion disk wind, and coronal activity. In this work, we conducted high-resolution, very long baseline interferometry observations to investigate jets in the highly accreting narrow-line Seyfert I system I Zw 1. Our observations successfully revealed small-scale jets (with a linear size of ∼45 pc) at both 1.5 and 5 GHz, based on the high radio brightness temperature, radio morphology, and spectral index distribution. Additionally, the parsec-scale jet observed in I Zw 1 displays a knotted morphology reminiscent of other sources accreting at similar rates. In summary, the high accretion rates and jet properties observed in the AGN I Zw 1 may support the AGN/X-ray binary analogy in this extreme state.


Xiaolong Yang

Shanghai Key Laboratory of Space Navigation and Positioning Techniques

Shanghai Astronomical Observatory

Beijing University of Technology

Su Yao


Luigi C. Gallo

Saint Mary's University

Jun Yang

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Luis C. Ho

Beijing University of Technology

Minfeng Gu

Shanghai Astronomical Observatory

Willem A. Baan

Xinjiang Astronomical Observatory

Netherlands Institute for Radio Astronomy (ASTRON)

Jiri Svoboda

Czech Academy of Sciences

Ran Wang

Beijing University of Technology

Xiang Liu

Xinjiang Astronomical Observatory

X. Y. Hong

Shanghai Key Laboratory of Space Navigation and Positioning Techniques

Shanghai Astronomical Observatory

Chinese Academy of Sciences

Xue Bing Wu

Beijing University of Technology

Wei Zhao

Shanghai Astronomical Observatory

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 966 2 151


Astronomi, astrofysik och kosmologi


Onsala rymdobservatorium



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