VLBA Reveals the Absence of a Compact Radio Core in the Radio-intermediate Quasar J2242+0334 at z = 5.9

Liu, Yuanqi; Wang, Ran; Momjian, Emmanuel; Zhang, Yingkang; An, Tao; Yang, Xiaolong; Wagg, Jeff; Bañados, Eduardo; Omont, A.

doi:10.3847/2041-8213/ac98b2

Cited by 5 publications

(7 citation statements)

References 47 publications

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“…On the other hand, we detect compact radio knots on parsec scales in our EVN observations. If the findings of Liu et al (2022) are true, the parsec-scale knots detected in our EVN observations are likely to be a jet. However, these radio structures lack a traditional linear jet-like morphology as can be seen (e.g., Huchra & Burg 1992;Brunthaler et al 2000;Thean et al 2001).…”

Section: Agn Wind Versus Jetmentioning

confidence: 73%

“…They suggested that the AGN wind could escape through the path of least resistance, and the radio emission produced by these winds would be diffuse. A recent study by Liu et al (2022) using the Very Large Baseline Array has suggested that radio emission produced by AGN winds may not contain any compact structures. On the other hand, we detect compact radio knots on parsec scales in our EVN observations.…”

Section: Agn Wind Versus Jetmentioning

confidence: 99%

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The Close AGN Reference Survey (CARS): An Interplay between Radio Jets and AGN Radiation in the Radio-quiet AGN HE0040-1105

Singha,

Winkel,

Vaddi

et al. 2023

ApJ

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We present a case study of HE 0040-1105, an unobscured radio-quiet active galactic nucleus (AGN) at a high accretion rate of λ Edd = 0.19 ± 0.04. This particular AGN hosts an ionized gas outflow with the largest spatial offset from its nucleus compared to all other AGNs in the Close AGN Reference Survey. By combining multiwavelength observations from the Very Large Telescope/MUSE, Hubble Space Telescope/Wide Field Camera 3, Very Large Array, and European VLBI Network, we probe the ionization conditions, gas kinematics, and radio emission from host galaxy scales to the central few parsecs. We detect four kinematically distinct components, one of which is a spatially unresolved AGN-driven outflow located within the central 500 pc, where it locally dominates the interstellar medium conditions. Its velocity is too low to escape the host galaxy’s gravitational potential, and may be re-accreted onto the central black hole via chaotic cold accretion. We detect compact radio emission in HE 0040-1105 within the region covered by the outflow, varying on a timescale of ∼20 yr. We show that neither AGN coronal emission nor star formation processes wholly explain the radio morphology/spectrum. The spatial alignment between the outflowing ionized gas and the radio continuum emission on 100 pc scales is consistent with a weak jet morphology rather than diffuse radio emission produced by AGN winds. >90% of the outflowing ionized gas emission originates from the central 100 pc, within which the ionizing luminosity of the outflow is comparable to the mechanical power of the radio jet. Although radio jets might primarily drive the outflow in HE 0040-1105, radiation pressure from the AGN may contribute to this process.

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Section: Agn Wind Versus Jetmentioning

confidence: 73%

Section: Agn Wind Versus Jetmentioning

confidence: 99%

The Close AGN Reference Survey (CARS): An Interplay between Radio Jets and AGN Radiation in the Radio-quiet AGN HE0040-1105

Singha,

Winkel,

Vaddi

et al. 2023

ApJ

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“…data (e.g., Liu et al 2022). This gradually reduces the weight to 50% at UV distance (100, 80, 60, 40, 20) × Mλ (in units of wavelength).…”

Section: Data Reductionmentioning

confidence: 98%

Very Long Baseline Array Observations of Parsec-scale Radio Emission in Dual Active Galactic Nuclei

Xu,

Cui,

Liu

et al. 2024

ApJ

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It is believed that dual active galactic nuclei (AGN) form during galaxy mergers. Studying dual-AGN emission can provide valuable insights into galaxy merging and evolution. To investigate parsec-scale radio emission properties, we observed eight radio components of four selected dual-AGN systems using the Very Long Baseline Array (VLBA) at 5 GHz in multiple-phase-center mode. Among them, two compact radio components, labeled J0051+0020B and J2300-0005A, were detected clearly on parsec scales for the first time. However, the radio emission of the other six components was resolved out in the high-resolution images. We provide the values or upper limits of the brightness temperature and radio emission power, and analyze the emission origins in detail for each target. Based on their physical properties reported in this work and in the literature, we suggest that the radio emission in J0051+0020B and J2300-0005A originates primarily from compact jets, while the other six sources show more complex emission mechanisms. In addition, our VLBA observations suggest that the systematic X-ray deficit in our dual-AGN sample is likely attributed to the tidally induced effect and possibly a viewing angle effect.

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“…However, zooming into that radio emission on sub-kpc scales with higher resolution will provide non-detection of compact knots, if the radio emission is truly diffuse. Liu et al [149] used VLBA observations to zoom in the central 1 × 1 region of a z = 5 AGN J2242+0334. which could not be resolved by previous VLA observations.…”

Section: Synchrotron Emission From the Windsmentioning

confidence: 99%

What Drives the Ionized Gas Outflows in Radio-Quiet AGN?

2023

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We review the mechanisms driving the ionized gas outflows in radio-quiet (RQ) AGN. Although it constitutes ∼90% of the AGN population, what drives these outflows in these AGNs remains an open question. High-resolution imaging and integral field unit (IFU) observation is key to spatially resolving these outflows, whereas radio observations are important to comprehend the underlying radiative processes. Radio interferometric observations have detected linear, collimated structures on the hundreds of pc scale in RQ AGN, which may be very similar to the extended radio jets in powerful galaxies. Proper motions measured in some objects are sub-relativistic. Other processes, such as synchrotron radiation from shock-accelerated gas around the outflows could give rise to radio emissions as well. Near the launching region, these outflows may be driven by the thermal energy of the accretion disk and exhibit free–free emission. IFU observations on the other hand have detected evidence of both winds and jets and the outflows driven by them in radio-quiet AGN. Some examples include nearby AGN such as Mrk 1044 and HE 1353-1917. An IFU study of nearby (z <0.06) RQ AGN has found that these outflows may be related to their radio properties on <100 pc scale, rather than their accretion properties. Recent JWST observations of RQ AGN XID 2028 have revealed that radio jets and wind could inflate bubbles, create cavities, and trigger star formation. Future high-resolution multi-wavelength observations and numerical simulations taking account of both jets and winds are hence essential to understand the complex interaction between radio-quiet AGN and the host from sub-pc to kpc scales.

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VLBA Reveals the Absence of a Compact Radio Core in the Radio-intermediate Quasar J2242+0334 at z = 5.9

Cited by 5 publications

References 47 publications

The Close AGN Reference Survey (CARS): An Interplay between Radio Jets and AGN Radiation in the Radio-quiet AGN HE0040-1105

The Close AGN Reference Survey (CARS): An Interplay between Radio Jets and AGN Radiation in the Radio-quiet AGN HE0040-1105

Very Long Baseline Array Observations of Parsec-scale Radio Emission in Dual Active Galactic Nuclei

What Drives the Ionized Gas Outflows in Radio-Quiet AGN?

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