Multi-frequency VLBI observations detect a two-sided jet with steep synchrotron spectrum from the nearly dormant SMBH in M60, with frequency-dependent core shift locating the engine ~10 Schwarzschild radii upstream of the 8.37 GHz core.
Ultracompact jets in AGN
9 Pith papers cite this work. Polarity classification is still indexing.
9
Pith papers citing it
abstract
We study the properties of ultracompact jets in several prominent radio sources (Cygnus A, 3C 309.1, 3C 345, 3C 395, 4C 39.25, and 1038+528 A), using the frequency dependence of observed position of the optically thick jet core. Frequency dependent offsets of the core positions are used for calculating the luminosities, magnetic fields, and geometrical properties of the jets. Opacity effects are studied, for both synchrotron self-absorption and external free-free absorption. Pressure and density gradients in the jets and in surrounding ambient medium are shown to be a primary factor determining the observed properties of ultracompact jets. We discuss possible applications of opacity effects to studying the conditions existing in central regions of active galactic nuclei.
years
2026 9representative citing papers
VLBI monitoring reveals a 21c apparent speed in TXS 0506+056, interpreted as evidence for a stratified jet with Gamma>20 spine that accounts for neutrino production and radio flare timing.
Efficient neutrino production in blazar jets requires an external radiation field that strongly dominates the magnetic field (Y>>1), which radio constraints place near the broad-line region and only for uncommon jet acceleration or beaming conditions.
VLBI imaging detects a compact radio source with Tb > 10^7 K and flat spectrum in the northern core of UGC 2369S, confirming a buried low-luminosity AGN.
Spectral ages of a WAT and HT radio galaxy (~21–34 Myr) are ~7–20 times shorter than their dynamical ages, with spectral steepening and localized re-acceleration signatures of IGM interaction.
High-precision VLBI detects 250 μas core shift between 8.4 and 43.2 GHz in BL Lacertae, with fitted index k_r = 1.18 consistent with equipartition.
SKA+VLBI will deliver microarcsecond astrometry, polarimetry, and rapid multi-frequency imaging to track jets and accretion in X-ray binaries on AU scales.
Perspective outlining SKA-VLBI capabilities for resolving radio processes in radio-quiet AGN across kpc to sub-pc scales with sub-milliarcsecond imaging and μJy sensitivity.
A review outlining radio methods for dual AGN and SMBHB detection and the role of SKAO in enabling comprehensive studies across cosmic time.
citing papers explorer
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A Jet from a Nearly Dormant Black Hole
Multi-frequency VLBI observations detect a two-sided jet with steep synchrotron spectrum from the nearly dormant SMBH in M60, with frequency-dependent core shift locating the engine ~10 Schwarzschild radii upstream of the 8.37 GHz core.
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A hidden ultra-relativistic spine in the jet of a neutrino-associated blazar
VLBI monitoring reveals a 21c apparent speed in TXS 0506+056, interpreted as evidence for a stratified jet with Gamma>20 spine that accounts for neutrino production and radio flare timing.
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Locating the Production Sites of High-Energy Neutrinos in Blazar Jets
Efficient neutrino production in blazar jets requires an external radiation field that strongly dominates the magnetic field (Y>>1), which radio constraints place near the broad-line region and only for uncommon jet acceleration or beaming conditions.
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Direct VLBI evidence for a buried AGN in the triple-merger LIRG UGC 2369S
VLBI imaging detects a compact radio source with Tb > 10^7 K and flat spectrum in the northern core of UGC 2369S, confirming a buried low-luminosity AGN.
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Radio spectral properties and aging of two tailed radio galaxies in a galaxy group at z=0.35
Spectral ages of a WAT and HT radio galaxy (~21–34 Myr) are ~7–20 times shorter than their dynamical ages, with spectral steepening and localized re-acceleration signatures of IGM interaction.
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Detections of nearly bias-free core shifts with 5-30 $\mu$as precisions at 8-43 GHz in BL Lacertae
High-precision VLBI detects 250 μas core shift between 8.4 and 43.2 GHz in BL Lacertae, with fitted index k_r = 1.18 consistent with equipartition.
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Transforming X-ray Binary Astrophysics with SKA+VLBI
SKA+VLBI will deliver microarcsecond astrometry, polarimetry, and rapid multi-frequency imaging to track jets and accretion in X-ray binaries on AU scales.
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The SKA-VLBI Perspective on Radio-Quiet AGN
Perspective outlining SKA-VLBI capabilities for resolving radio processes in radio-quiet AGN across kpc to sub-pc scales with sub-milliarcsecond imaging and μJy sensitivity.
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Dual AGN and Multiple SMBH Systems in the Era of SKAO
A review outlining radio methods for dual AGN and SMBHB detection and the role of SKAO in enabling comprehensive studies across cosmic time.