Collimation, Acceleration and Recollimation Shock in the Jet of Gamma-Ray-emitting Radio-Loud Narrow-Line Seyfert 1 Galaxy 1H 0323+342

Abstract

We investigated the detailed radio structure of the jet of 1H 0323+342 using high-resolution multi-frequency Very Long Baseline Array observations. This source is known as the nearest $\gamma$-ray emitting radio-loud narrow-line Seyfert 1 (NLS1) galaxy. We discovered that the morphology of the inner jet is well characterized by a parabolic shape, indicating the jet being continuously collimated near the jet base. On the other hand, we found that the jet expands more rapidly at larger scales, resulting in a conical-like shape. The location of the "collimation break" is coincident with a bright quasi-stationary feature at 7 mas from core (corresponding to a deprojected distance of the order of $\sim$100pc), where the jet width locally contracts together with highly polarized signals, suggesting a recollimation shock. We found that the collimation region is coincident with the region where the jet speed gradually accelerates, suggesting the coexistence of the jet acceleration and collimation zone, ending up with the recollimation shock, which could be a potential site of high-energy $\gamma$-ray flares detected by the Fermi-LAT. Remarkably, these observational features of the 1H 0323+342 jet are overall very similar to those of the nearby radio galaxy M87 and HST-1 as well as some blazars, suggesting that a common jet formation mechanism might be at work. Based on the similarity of the jet profile between the two sources, we also briefly discuss the mass of the central black hole of 1H 0323+342, which is also still highly controversial on this source and NLS1s in general.

Accepted for publication in ApJ. 15pages, 9 figures

References in corpus (28)

• Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
• MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. V. Multi-epoch VLBA Images
• 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
• Kinematics of the jet in M87 on scales of 100 -- 1000 Schwarzschild radii
• MOJAVE - XIV. Shapes and opening angles of AGN jets
• Superluminal Radio Features in the M87 Jet and the Site of Flaring TeV Gamma-ray Emission
• A numerical simulation of the evolution and fate of a FRI jet. The case of 3C 31
• A narrow line Seyfert 1--blazar composite nucleus in 2MASX J0324+3410
• A wide and collimated radio jet in 3C 84 on the scale of a few hundred gravitational radii
• Faraday rotation and polarization gradients in the jet of 3C~120: Interaction with the external medium and a helical magnetic field?
• Radio jet emission from GeV-emitting narrow-line Seyfert 1 galaxies
• The Peculiar Radio-Loud Narrow Line Seyfert 1 Galaxy 1H 0323+342
• The spectral energy distribution of PKS 2004-447: a compact steep-spectrum source and possible radio-loud narrow-line Seyfert 1 galaxy
• Gamma-ray Emitting Narrow Line Seyfert 1 Galaxies in The Sloan Digital Sky Survey
• 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 most powerful flaring activity from the NLSy1 PMN J0948+0022
• Structural Transition in the NGC 6251 Jet: An Interplay with the Supermassive Black Hole and Its Host Galaxy
• Uncovering the host galaxy of the $\gamma$-ray-emitting narrow-line Seyfert 1 galaxy FBQS J1644+2619
• On the black hole mass of the gamma-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
• Discovery of a pseudobulge galaxy launching powerful relativistic jets
• The relativistic jet of the gamma-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
• Inner jet kinematics and the viewing angle towards the γ-ray narrow-line Seyfert 1 galaxy 1H 0323+342
• VLBA polarimetric monitoring of 3C 111
• A Recollimation Shock in a Stationary Jet Feature with Limb-brightening in the Gamma-ray Emitting Narrow-line Seyfert 1 Galaxy 1H 0323+342
• Variable optical polarization during high state in gamma-ray loud narrow line Seyfert 1 galaxy 1H 0323+342

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