Revealing a ribbon-like jet in OJ 287 with RadioAstron
arXiv:2508.01747 · doi:10.1051/0004-6361/202554929
Abstract
We present space-based very long baseline interferometry observations of the BL Lac type object OJ 287 taken with RadioAstron at 22 GHz on April 25, 2016, in conjunction with a ground array comprising 27 radio telescopes. We detect ground-space fringes at projected baselines extending up to 4.6 Earth diameters, which allowed us to image the jet in OJ 287 with an angular resolution of ~47 μas. Applying an advanced regularized maximum likelihood imaging method, we resolved the innermost jet structure with a complex morphology at a resolution of ~15 μas (~0.1 pc projected distance). For the first time, due to a favorable geometrical position of the jet in tandem with high data quality, we detect multiple sharp bends that form a "ribbon-like" jet structure that extends down to 1 mas. Two-dimensional Gaussian model-fitting reveals regions of the jet with brightness temperatures of more than 10^13 K, indicative of strong Doppler boosting. Polarimetric imaging reveals that the electric vector position angles are predominantly perpendicular to the innermost jet direction, implying a dominant poloidal magnetic field component near the central engine. Complementary multi-epoch Very Long Baseline Array observations at 43 GHz provide a multifrequency view of the jet evolution. Ridgeline analysis of the 43 GHz data shows significant variations in the jet position angle from 2014 to 2017, behavior consistent with a rotating helical jet structure. Finally, we confirm the emergence of a new jet component (B15 or K), which may be associated with the source's first TeV flare, and offer new observational constraints relevant to models involving a supermassive black hole binary.
arXiv comment12 pages, 6 figures, 2 tables. Submitted to Astronomy & Astrophysics
References in corpus (46)
- Observation of Gravitational Waves from a Binary Black Hole Merger
- The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background
- First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
- MOJAVE: Monitoring of Jets in Active Galactic Nuclei with VLBA Experiments. VI. Kinematics Analysis of a Complete Sample of Blazar Jets
- DiFX2: A more flexible, efficient, robust and powerful software correlator
- First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
- First Sagittarius A* Event Horizon Telescope Results. III: Imaging of the Galactic Center Supermassive Black Hole
- A massive binary black-hole system in OJ287 and a test of general relativity
- Kinematics of Parsec-Scale Jets of Gamma-Ray Blazars at 43~GHz within the VLBA-BU-BLAZAR Program
- Accretion into the Central Cavity of a Circumbinary Disk
- RadioAstron -- a Telescope with a Size of 300 000 km: Main Parameters and First Observational Results
- High Resolution Linear Polarimetric Imaging for the Event Horizon Telescope
- Interferometric Imaging Directly with Closure Phases and Closure Amplitudes
- Dual Jets from Binary Black Holes
- Protogalactic Disk Models of Damped Lya Kinematics
- Single-epoch VLBI imaging study of bright active galactic nuclei at 2 and 8 GHz
- Kinematics of Parsec-Scale Jets of Gamma-Ray Bright Blazars at 43 GHz during Ten Years of the VLBA-BU-BLAZAR Program
- Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron. I. Imaging BL Lacertae at 21 microarcsecond resolution
- Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using its General Relativity Centenary Flare: Improved Orbital Parameters
- On the two main classes of Active Galactic Nuclei
- MOJAVE XII: Acceleration and Collimation of Blazar Jets on Parsec Scales
- Accretion disks around binary black holes of unequal mass: GRMHD simulations of postdecoupling and merger
- RadioAstron Observations of the Quasar 3C273: a Challenge to the Brightness Temperature Limit
- Erratic Jet Wobbling in the BL Lacertae Object OJ287 Revealed by Sixteen Years of 7mm VLBA Observations
- Relativistic Outflow Drives Gamma-Ray Emission in 3C345
- Can long-term periodic variability and jet helicity in 3C 120 be explained by jet precession?
- Location of Gamma-ray emission and magnetic field strengths in OJ 287
- Filamentary structures as the origin of blazar jet radio variability
- Multiband optical variability of the blazar OJ 287 during its outbursts in 2015 -- 2016
- Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron II. Observations of 3C 273 at minimum activity
- The Mid-Infrared Properties of X-ray Sources
- Detection statistics of the RadioAstron AGN survey
- Tidal Disruption Events by a Massive Black Hole Binary
- Absence of the predicted 2022 October outburst of OJ 287 and implications for binary SMBH scenarios
- RadioAstron space VLBI imaging of polarized radio emission in the high-redshift quasar 0642+449 at 1.6 GHz
- Unravelling the Innermost Jet Structure of OJ 287 with the First GMVA+ALMA Observations
- MOMO VI: Multifrequency radio variability of the blazar OJ 287 from 2015-2022, absence of predicted 2021 precursor-flare activity, and a new binary interpretation of the 2016/2017 outburst
- High cadence, linear and circular polarization monitoring of OJ 287 - Helical magnetic field in a bent jet
- Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron. III. Blazar S5 0716+71 at microarcsecond resolution
- Refining the 2022 OJ 287 impact flare arrival epoch
- RadioAstron discovery of a mini-cocoon around the restarted parsec-scale jet in 3C 84
- New jet feature in the parsec-scale jet of the blazar OJ287 connected to the 2017 teraelectronvolt flaring activity
- Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron IV. The quasar 3C 345 at 18 cm: Magnetic field structure and brightness temperature
- A multi-frequency study of sub-parsec jets with the Event Horizon Telescope
- GW170817: A Neutron Star Merger in a Mass-Transferring Triple System
- Unveiling the Bent Jet Structure and Polarization of OJ 287 at 1.7 GHz with Space VLBI