Jet collimation and acceleration in the giant radio galaxy NGC 315

Abstract

We study the collimation and acceleration of the jets in the nearby giant radio galaxy NGC 315, using multifrequency Very Long Baseline Array observations and archival High Sensitivity Array and Very Large Array data. We find that the jet geometry transitions from a semi-parabolic shape into a conical/hyperbolic shape at a distance of $\approx 10^5$ gravitational radii. We constrain the frequency-dependent position of the core, from which we locate the jet base. The jet collimation profile in the parabolic region is in good agreement with the steady axisymmetric force-free electrodynamic solution for the outermost poloidal magnetic field line anchored to the black hole event horizon on the equatorial plane, similar to the nearby radio galaxies M87 and NGC 6251. The velocity field derived from the asymmetry in brightness between the jet and counterjet shows gradual acceleration up to the bulk Lorentz factor of $\Gamma \sim 3$ in the region where the jet collimation occurs, confirming the presence of the jet acceleration and collimation zone. These results suggest that the jets are collimated by the pressure of the surrounding medium and accelerated by converting Poynting flux to kinetic energy flux. We discover limb-brightening of the jet in a limited distance range where the angular resolution of our data is sufficient to resolve the jet transverse structure. This indicates that either the jet has a stratified velocity field of fast-inner and slow-outer layers or the particle acceleration process is more efficient in the outer layer due to the interaction with the surroundings on pc-scales.

32 pages, 18 figures, 5 tables, accepted for publication in ApJ

References in corpus (46)

• The NumPy array: a structure for efficient numerical computation
• Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
• Jet Launching Structure Resolved Near the Supermassive Black Hole in M87
• Magnetic acceleration of ultra-relativistic jets in gamma-ray burst sources
• Magnetic acceleration of relativistic AGN jets
• Kinematics of Parsec-Scale Jets of Gamma-Ray Blazars at 43~GHz within the VLBA-BU-BLAZAR Program
• Fast variability of TeV gamma-rays from the radio galaxy M 87
• MOJAVE: XV. VLBA 15 GHz Total Intensity and Polarization Maps of 437 Parsec-Scale AGN Jets From 1996-2017
• Kinematics of the jet in M87 on scales of 100 -- 1000 Schwarzschild radii
• MOJAVE. XVII. Jet Kinematics and Parent Population Properties of Relativistically Beamed Radio-Loud Blazars
• Numerical Simulation of Hot Accretion Flows (III): Revisiting wind properties using trajectory approach
• The Inner Jet of the Radio Galaxy M87
• A Global 86GHz VLBI Survey of Compact Radio Sources
• Spine-sheath layer radiative interplay in subparsec-scale jets and the TeV emission from M87
• Dynamics and High Energy Emission of the Flaring HST-1 Knot in the M 87 Jet
• Superluminal Radio Features in the M87 Jet and the Site of Flaring TeV Gamma-ray Emission
• 230 GHz VLBI observations of M87: event-horizon-scale structure at the enhanced very-high-energy $\gamma$-ray state in 2012
• Three dimensional magnetic field structure of six parsec-scale active galactic nuclei jets
• Hot Atmospheres, Cold Gas, AGN Feedback and the Evolution of Early Type Galaxies: a Topical Perspective
• Recollimation and Radiative Focusing of Relativistic Jets: Applications to Blazars and M87
• Faraday rotation in the jet of M87 inside the Bondi radius: indication of winds from hot accretion flows confining the relativistic jet
• Self-Similar Force-Free Wind From an Accretion Disk
• Aligning VLBI Images of Active Galactic Nuclei at Different Frequencies
• Kinematics of the M87 jet in the collimation zone: gradual acceleration and velocity stratification
• Through The Ring Of Fire: $\gamma$-Ray Variability In Blazars By A Moving Plasmoid Passing A Local Source Of Seed Photons
• On the spine-layer scenario for the very high-energy emission of NGC 1275
• Pilot KaVA monitoring on the M87 jet: confirming the inner jet structure and superluminal motions at sub-pc scales
• A strong radio brightening at the jet base of M87 during the elevated very-high-energy gamma-ray state in 2012
• The inner jet of radio galaxy NGC 315 as observed with Chandra and the VLA
• Wavelet-based decomposition and analysis of structural patterns in astronomical images
• Structural Transition in the NGC 6251 Jet: An Interplay with the Supermassive Black Hole and Its Host Galaxy
• VLBI observations of bright AGN jets with KVN and VERA Array (KaVA): Evaluation of Imaging Capability
• Asymmetric jet production in the Active Galactic Nucleus of NGC1052
• Steady General Relativistic Magnetohydrodynamic Inflow/Outflow Solution along Large-Scale Magnetic Fields that Thread a Rotating Black Hole
• The Two-sided Jet Structures of NGC 1052 at Scales from 300 to $4\times 10^7$ Schwarzschild Radii
• A New Hardware Correlator in Korea: Performance Evaluation using KVN observations
• Stronger Constraints on the Evolution of the $M_{\mathrm{BH}}-{\sigma }_{\ast }$ Relation up to $z\sim 0.6$
• The TeV-emitting radio galaxy 3C 264. VLBI kinematics and SED modeling
• A Magnetohydrodynamic Model of The M87 Jet. II. Self-consistent Quad-shock Jet Model for Optical Relativistic Motions and Particle Acceleration
• GPCAL: a generalized calibration pipeline for instrumental polarization in VLBI data
• The long-term centimeter variability of active galactic nuclei: A new relation between variability timescale and accretion rate
• Ejection of Double knots from the radio core of PKS 1510--089 during the strong gamma-ray flares in 2015
• Reconfinement of highly magnetized jets: Implications for HST-1 in M87
• Jet Kinematics of the Quasar 4C +21.35 from Observations with the KaVA Very Long Baseline Interferometry Array
• What is the Hidden Depolarization Mechanism in Low Luminosity AGN?
• A comparative study of amplitude calibrations for East-Asia VLBI Network: a-priori and template spectrum methods

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• Properties of the jet in M87 revealed by its helical structure imaged with the VLBA at 8 and 15 GHz
• Collimation of the relativistic jet in the quasar 3C 273
• Exploring the disk-jet connection in NGC 315
• Jets in radio galaxies and quasars: an observational perspective
• Pinpointing the jet apex of 3C 84
• Decoding the giant extragalactic radio sources
• Spectral analysis of a parsec-scale jet in M87: Observational constraint on the magnetic field strengths in the jet
• Ambilateral collimation study of the twin-jets in NGC1052
• M87: a cosmic laboratory for deciphering black hole accretion and jet formation
• Dual-high-frequency VLBI study of blazar-jet brightness-temperature gradients and collimation profiles
• ExHaLe-jet: An extended hadro-leptonic jet model for blazars. I. Code description and initial results
• Signatures of Black Hole Spin and Plasma Acceleration in Jet Polarimetry
• Discovery of Limb Brightening in the Parsec-scale Jet of NGC 315 through Global Very Long Baseline Interferometry Observations and Its Implications for Jet Models
• Overview of the Observing System and Initial Scientific Accomplishments of the East Asian VLBI Network (EAVN)
• Core shift in parabolic accelerating jets
• Polarization Observations of AGN Jets: Past and Future
• Observational Evidence to Support a Dense Ambient Medium Shaping the Jet in 3C 84
• Jet Collimation and Acceleration in the Flat Spectrum Radio Quasar 1928+738
• Kinematics and Collimation of the Two-Sided Jets in NGC 4261: VLBI Study on Sub-parsec Scales
• Two-dimensional Particle-in-Cell simulations of axisymmetric black hole magnetospheres: angular dependence of the Blandford-Znajek flux
• Parabolic jet shape on parsec scales in high redshift AGN
• The beaming effect for Fermi-LAT-detected FR-I radio galaxies
• First Adiabatic Invariant and the Brightness Temperature of Relativistic Jets
• On the possible core shift break in relativistic jets
• Jet formation studies in AGN: a search for new targets
• Analysis of Jet Dynamics and Collimation Characteristics of 0241+622 on Parsec Scales
• A revised view of the linear polarization in the subparsec core of M87 at 7 mm
• Blazar flares from plasma blobs crossing the broad-line region
• Identifying changing jets through their radio variability