The life cycle of magnetars: a novel approach to estimate their ages

Abstract

Anomalous X-ray pulsars and soft gamma repeaters are slowly rotating, young, and isolated neutron stars exhibiting sporadic outbursts and high X-ray quiescent luminosities. They are believed to be powered by ultrastrong magnetic fields, $B\sim 10^{14}-10^{15}$ G, associated with `magnetars'. In the peculiar case of SGR 0418+5729, timing parameters imply a dipolar $B$-field of $6.1\times 10^{12}$ G. This discovery has challenged the traditional picture of magnetars in terms of $B$-field strengths, evolutionary stages, and ages. Here we provide a novel approach to estimate a magnetar's age by considering the self-consistent time evolution of a plasma-filled oblique pulsar with the state-of-the-art magnetospheric particle acceleration gaps. The rotational period of magnetars increases over time due to angular momentum extraction by gravitational-wave radiations, magnetic dipole radiations, and particle winds. These torques also change the obliquity angle between the magnetic and rotation axes. For SGR 0418+5729, we obtain a dipolar $B$-field of $1.0\times 10^{14}$ G, and a realistic age of $\sim 18$ kyr, consistent within the magnetar paradigm.

arXiv comment8 pages, 3 figures. Accepted for publication in ApJ Letters

References in corpus (39)

• Time-dependent force-free pulsar magnetospheres: axisymmetric and oblique rotators
• The strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars
• Electrodynamics of Magnetars: Implications for the Persistent X-ray Emission and Spindown of the Soft Gamma Repeaters and Anomalous X-ray Pulsars
• Gravitational Waves from Neutron Stars with Large Toroidal B-fields
• A low-magnetic-field Soft Gamma Repeater
• Explosive reconnection in magnetars
• Modelling magnetically deformed neutron stars
• Magnetic Field Evolution in Neutron Star Crusts due to the Hall Effect and Ohmic Decay
• Resistive Solutions for Pulsar Magnetospheres
• A variable absorption feature in the X-ray spectrum of a magnetar
• Magnetic field dissipation in neutron star crusts: from magnetars to isolated neutron stars
• Ab-initio pulsar magnetosphere: three-dimensional particle-in-cell simulations of oblique pulsars
• Supernova remnant energetics and magnetars: no evidence in favour of millisecond proto-neutron stars
• 2D Cooling of Magnetized Neutron Stars
• The Power of Axisymmetric Pulsar
• A new low magnetic field magnetar: the 2011 outburst of Swift J1822.3-1606
• Radio Quiet Pulsars with Ultra-Strong Magnetic Fields
• Anomalous X-ray Pulsars and Soft Gamma-Ray Repeaters in supernova remnants
• Period clustering of the Anomalous X-ray Pulsars and magnetic field decay in magnetars
• Revised Pulsar Spindown
• Gravitational Radiation from Newborn Magnetars
• Gravitational wave emission from a magnetically deformed non-barotropic neutron star
• Hall Effect in Neutron Star Crusts: Evolution, Endpoint and Dependence on Initial Conditions
• Possible Evidence for Free Precession of a Strongly Magnetized Neutron Star in the Magnetar 4U 0142+61
• Magnetic field evolution in magnetar crusts through three dimensional simulations
• The impact of magnetic field on the thermal evolution of neutron stars
• Magnetars vs. high magnetic field pulsars: a theoretical interpretation of the apparent dichotomy
• Is SGR 0418+5729 indeed a waning magnetar ?
• Hall Attractor in Axially Symmetric Magnetic Fields in Neutron Star Crusts
• Proper Motions and Origins of SGR 1806-20 and SGR 1900+14
• Ambipolar diffusion in superfluid neutron stars
• The Outburst Decay of the Low Magnetic Field Magnetar SWIFT J1822.3-1606: Phase-resolved Analysis and Evidence for a Variable Cyclotron Feature
• A Magnetar Strength Surface Magnetic Field for the Slowly Spinning Down SGR 0418+5729
• Chandra and XMM-Newton imaging and spectroscopic study of the supernova remnant Kes 73 hosting the magnetar 1E 1841-045
• Magnetar birth: rotation rates and gravitational-wave emission
• Chandra observation of the Galactic supernova remnant CTB 109 (G109.1-1.0)
• Suzaku Studies of the Supernova Remnant CTB~109 Hosting the Magnetar 1E~2259+586
• Timescales for detection of super-Chandrasekhar white dwarfs by gravitational wave astronomy
• SGR 0418+5729: a small inclination angle resulting in a not so low dipole magnetic field?

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