Polarized radio emission from a magnetar

Abstract

We present polarization observations of the radio emitting magnetar AXP J1810-197. Using simultaneous multi-frequency observations performed at 1.4, 4.9 and 8.4 GHz, we obtained polarization information for single pulses and the average pulse profile at several epochs. We find that in several respects this magnetar source shows similarities to the emission properties of normal radio pulsars while simultaneously showing striking differences. The emission is nearly 80-95% polarized, often with a low but significant degree of circular polarization at all frequencies which can be much greater in selected single pulses. The position angle swing has a low average slope of only 1 deg/deg, deviating significantly from an S-like swing as often seen in radio pulsars which is usually interpreted in terms of a rotating vector model and a dipolar magnetic field. The observed position angle is consistent at all frequencies while showing significant secular variations. On average the interpulse is less linearly polarized but shows a higher degree of circular polarization. Some epochs reveal the existence of non-orthogonal emission modes in the main pulse and systematic wiggles in the PA swing, while the interpulse shows a large variety of position angle values. We interprete many of the emission properties as propagation effects in a non-dipolar magnetic field configuration where emission from different multipole components is observed.

accepted for publication in MNRAS, 15 pages, 11 figures. Figure 9 in reduced quality, full resolution preprint at ftp://ftp.jb.man.ac.uk/pub/mk/preprint/ksj+07.pdf, typos fixed

References in corpus (20)

• Transient radio bursts from rotating neutron stars
• Transient pulsed radio emission from a magnetar
• Discovery of a New Transient Magnetar Candidate: XTE J1810-197
• Is pulsar B0656+14 a very nearby RRAT source?
• PSR J1847-0130: A Radio Pulsar with Magnetar Spin Characteristics
• High time-resolution observations of the Vela pulsar
• Profile morphology and polarization of young pulsars
• The characteristics of millisecond pulsar emission: II. Polarimetry
• Discovery of Radio Emission from Transient Anomalous X-ray Pulsar XTE J1810-197
• The effect of HII regions on rotation measure of pulsars
• Probing drifting and nulling mechanisms through their interaction in PSR B0809+74
• A search for giant pulses in Vela-like pulsars
• Ellipticity and Deviations from Orthogonality in the Polarization Modes of PSR B0329+54
• The bright spiky emission of pulsar B0656+14
• Simultaneous single-pulse observations of radio pulsars: II. Orthogonal polarization modes in PSR B1133+16
• Absolute polarisation position angle profiles of southern pulsars at 1.4 and 3.1 GHz
• High frequency observations of southern pulsars
• Simultaneous single-pulse observations of radio pulsars III. The behaviour of circular polarization
• Simultaneous single-pulse observations of radio pulsars: I. The polarization characteristics of PSR B0329+54
• PSR J1907+0918 - a young radio pulsar near SGR 1900+14 and G42.8+0.6

Cited by in corpus (68)

• 1E 1547.0-5408: a radio-emitting magnetar with a rotation period of 2 seconds
• A Radio-loud Magnetar in X-ray Quiescence
• A fast radio burst source at a complex magnetised site in a barred galaxy
• The glitch-induced identity changes of PSR J1119-6127
• The braking index of PSR J1734-3333 and the magnetar population
• Discovery of a radio emitting neutron star with an ultra-long spin period of 76 seconds
• Revival of the magnetar PSR J1622-4950: observations with MeerKAT, Parkes, XMM-Newton, Swift, Chandra, and NuSTAR
• Repeating Fast Radio Bursts from Magnetars with Low Magnetospheric Twist
• The magnetar 1E 1547.0-5408: radio spectrum, polarimetry, and timing
• Detection of two bright radio bursts from magnetar SGR 1935+2154
• Condensed Surfaces of Magnetic Neutron Stars, Thermal Surface Emission, and Particle Acceleration Above Pulsar Polar Caps
• Radio emission evolution, polarimetry and multifrequency single pulse analysis of the radio magnetar PSR J1622-4950
• Pulse Broadening Measurements from the Galactic Center Pulsar J1745--2900
• The variable radio-to-X-ray spectrum of the magnetar XTE J1810-197
• Detailed high-energy characteristics of AXP 1RXS J170849-400910 - Probing the magnetosphere using INTEGRAL, RXTE and XMM-Newton
• Polarization properties of FRB 20201124A from detections with the 100-m Effelsberg Radio Telescope
• Magnetars: a short review and some sparse considerations
• Radio disappearance of the magnetar XTE J1810-197 and continued X-ray timing
• Simultaneous multifrequency radio observations of the Galactic Centre magnetar SGR J1745-2900
• Multi-wavelength Observations of the Radio Magnetar PSR J1622-4950 and Discovery of its Possibly Associated Supernova Remnant
• Wideband polarized radio emission from the newly revived magnetar XTE J1810$-$197
• From outburst to quiescence: the decay of the transient Anomalous X-ray Pulsar XTE J1810-197
• Large magnetic field variations towards the Galactic Centre magnetar, PSR J1745-2900
• Radio spectrum of the AXP J1810-197 and of its profile components
• The SUrvey for Pulsars and Extragalactic Radio Bursts III: Polarization properties of FRBs 160102 & 151230
• Polarimetry of the superluminous supernova LSQ14mo: no evidence for significant deviations from spherical symmetry
• Simultaneous multi-frequency single-pulse properties of AXP XTE J1810-197
• Electron-Positron Plasma Generation in a Magnetar Magnetosphere
• Detection of the magnetar SGR J1745-2900 up to 291 GHz with evidence of polarized millimetre emission
• Spin frequency evolution and pulse profile variations of the recently re-activated radio magnetar XTE J1810-197
• Electrodynamics of Magnetars III: Pair Creation Processes in an Ultrastrong Magnetic Field and Particle Heating in a Dynamic Magnetosphere
• Spectropolarimetric properties of Swift J1818.0$-$1607: a 1.4 s radio magnetar
• Quasi-periodic sub-pulse structure as a unifying feature for radio-emitting neutron stars
• Magnetar birth: rotation rates and gravitational-wave emission
• Electrodynamics of Magnetars IV: Self-Consistent Model of the Inner Accelerator, with Implications for Pulsed Radio Emission
• Emission geometry, radiation pattern, and magnetic topology of the magnetar XTE J1810-197 in its quiescent state
• The dynamic magnetosphere of Swift J1818.0$-$1607
• Observations of pulsars at 9 millimetres
• The 2018 X-ray and Radio Outburst of Magnetar XTE J1810-197
• On the pulse-width statistics in radio pulsars. III. Importance of the conal profile components
• Spin-down rate and inferred dipole magnetic field of the soft gamma-ray repeater SGR 1627-41
• Radio and X-ray observations of giant pulses from XTE J1810-197
• Radio polarization measurements from RRAT J1819-1458
• Deep Synoptic Array Science: Polarimetry of 25 New Fast Radio Bursts Provides Insights into their Origins
• High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst
• Do radio magnetars J1550-5418 and J1622-4950 have gigahertz-peaked spectra?
• Linear to circular conversion in the polarized radio emission of a magnetar
• The First Day in the Life of a Magnetar: Evolution of the Inclination Angle, Magnetic Dipole Moment and Braking Index of Millisecond Magnetars During Gamma-Ray Burst Afterglows
• Rotating vector model for magnetars
• Long term radio and X-ray evolution of the magnetar Swift J1818.0-1607
• On the nature of some SGRs and AXPs as rotation-powered neutron stars
• A highly magnetized long-period radio transient exhibiting unusual emission features
• Submillimeter pulsations from the magnetar XTE J1810-197
• A broadband radio study of PSR J0250+5854: the slowest-spinning radio pulsar known
• Precession of magnetars: dynamical evolutions and modulations on polarized electromagnetic waves
• Multi-frequency radio observations of the radio-loud magnetar XTE J1810-197
• The High Time Resolution Universe Pulsar Survey -- XVIII. The reprocessing of the HTRU-S Low Lat survey around the Galactic centre using a Fast Folding Algorithm pipeline for accelerated pulsars
• $4-8\mathrm{GHz}$ Spectro-temporal Emission from the Galactic Center Magnetar $\mathrm{PSR}J1745-2900$
• VLA Observations of Single Pulses from the Galactic Center Magnetar
• Testing afterglow models of FRB 200428 with early post-burst observations of SGR 1935+2154
• An activity transition in FRB 20201124A: methodological rigor, detection of frequency-dependent cessation, and a geometric magnetar model
• Angular Dependence of Coherent Radio Emission from Magnetars with Multipolar Magnetic Fields
• An unidentified Fermi source emitting radio bursts in the Galactic bulge
• The Northern Cross Fast Radio Burst project: V. Search for transient radio emission from Galactic magnetars
• Tera-Hertz Counterparts to Fast Radio Bursts from Coherent Cherenkov Radiation by Tilted Bunches
• X-ray and Radio Bursts from the Magnetar 1E1547.0-5408
• Giant radio pulses in the magnetar XTE J1810-197 detected with the IAR's telescopes
• Searching radio signals from two magnetars and a high-magnetic field pulsar and the serendipitous discovery of a new radio pulsar PSR J1935+2200