Radio Study of the Pulsar Wind Nebula Powered by PSR B1706-44

Abstract

PSR B1706$-$44 is an energetic gamma-ray pulsar located inside supernova remnant (SNR) G343.1$-$2.3 and it powers a compact pulsar wind nebula (PWN) that shows torus and jet structure in X-rays. We present a radio study of the PWN using Australia Telescope Compact Array (ATCA) observations at 3, 6, 13, and 21\,cm. We found an overall arc-like morphology at 3 and 6\,cm, and the ``arc" shows two distinct peaks at 6\,cm. The radio emission is faint inside the X-ray PWN and only brightens beyond that. We develop a thick torus model with Doppler boosting effect to explain the radio PWN structure. The model suggests a bulk flow speed of $\sim 0.2c$, which could indicate significant deceleration of the flow from the X-ray emitting region. Our polarization result reveals a highly ordered toroidal $B$-field in the PWN. Its origin is unclear given that the supernova reverse shock should have interacted with the PWN. At a larger scale, the 13 and 21\,cm radio images detected a semi-circular rim and an east-west ridge of G343.1$-$2.3. We argue that the latter could possibly be a pulsar tail rather than a filament of the SNR, as supported by the flat radio spectrum and the alignment between the magnetic field and its elongation.

arXiv comment16 pages, 9 figures, accepted by APJ

References in corpus (29)

• The ATNF Pulsar Catalogue
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• Reconnection in a striped pulsar wind
• The Australia Telescope Compact Array Broadband Backend (CABB)
• Fitting Pulsar Wind Tori
• Evidence for alignment of the rotation and velocity vectors in pulsars
• Spectral properties of 441 radio pulsars
• The Radio Lifetime of Supernova Remnants and the Distribution of Pulsar Velocities at Birth
• Fitting Pulsar Wind Tori. II. Error Analysis and Applications
• A Multi-Frequency Radio Study of Supernova Remnant G292.0+1.8 and its Pulsar Wind Nebula
• Radio Images of 3C 58: Expansion and Motion of its Wisp
• The Vela Pulsar's Radio Nebula
• X-ray Observations of Parsec-Scale Tails behind Two Middle-Aged Pulsars
• DA495 - an aging pulsar wind nebula
• The Expansion and Radio Spectral Index of G21.5-0.9: Is PSR J1833-1034 the Youngest Pulsar?
• The Complex Wind Torus and Jets of PSR B1706-44
• Discovery of an Energetic Pulsar Associated with SNR G76.9+1.0
• Radio Polarization Observations of G319.9-0.7: A Bow-shock Nebula with an Azimuthal Magnetic Field Powered by Pulsar J1509-5850
• A Radio Study of the Mouse, G359.23--0.82
• Pulsar wind nebulae around the southern pulsars PSR B1643-43 and PSR B1706-44
• Radio Polarization Observations of the Snail: A Crushed Pulsar Wind Nebula in G327.1-1.1 with a Highly Ordered Magnetic Field
• Modelling Jets, Tori and Flares in Pulsar Wind Nebulae
• Morphological properties of the Crab Nebula: a detailed multiwavelength study based on new VLA, HST, Chandra and XMM-Newton images
• Pulsar Wind Nebulae with Thick Toroidal Structure
• Detection of very-high-energy gamma-ray emission from the vicinity of PSR B1706-44 and G343.1-2.3 with H.E.S.S
• A Radio Continuum and Polarisation Study of the pulsar wind nebula CTB87 (G74.9+1.2)
• On the association of G343.1-2.3 and PSR 1706-44
• PSR J1709-4429's Proper Motion and its Relationship to SNR G343.1-2.3
• High-Resolution Radio Study of the Dragonfly Nebula

Cited by in corpus (2)

• X-ray Polarisation in Magnetar Atmospheres -- Effects of Mode Conversion
• High-resolution Radio Study of Pulsar Wind Nebula MSH 15-52 and Supernova Remnant RCW 89