Unveiling the Small-scale Jets in the Rapidly Growing Supermassive Black Hole IZw1

0586060 - ASÚ 2025 RIV GB eng J - Journal Article
Yang, X. - Yao, S. - Gallo, L. C. - Yang, J. - Ho, L. C. - Gu, M. - Baan, W. A. - Svoboda, Jiří - Wang, R. - Liu, X. - Hong, X. - Wu, X. - Zhao, W.
Unveiling the Small-scale Jets in the Rapidly Growing Supermassive Black Hole IZw1.
Astrophysical Journal. Roč. 966, č. 2 (2024), č. článku 151. ISSN 0004-637X. E-ISSN 1538-4357
R&D Projects: GA ČR(CZ) GJ19-05599Y
Institutional support: RVO:67985815
Keywords : active galactic nuclei * accretion * very long baseline interferometry
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 4.9, year: 2022
Method of publishing: Open access

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 similar to 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.
Permanent Link: https://hdl.handle.net/11104/0354186