Pulse Frequency Fluctuations of Magnetars

Abstract

Using \emph{RXTE}, \emph{Chandra}, \emph{XMM-Newton} and \emph{Swift} observations, we for the first time construct the power spectra and torque noise strengths of magnetars. For some of the sources, we measure strong red noise on timescales months to years which might be a consequence of their outbursts. We compare noise strengths of magnetars with those of radio pulsars by investigating possible correlations of noise strengths with spin-down rate, magnetic field and age. Using these correlations, we find that magnetar noise strengths are obeying similar trends with radio pulsars. On the contrary, we do not find any correlation between noise strength and X-ray luminosity which was seen in accretion powered pulsars. Our findings suggest that the noise behaviour of magnetars resembles that of radio pulsars but they possess higher noise levels likely due to their stronger magnetic fields.

arXiv comment18 pages, 1 table, 4 figures, accepted for publication in MNRAS

References in corpus (56)

• Magnetars
• The McGill Magnetar Catalog
• Electrodynamics of Magnetars: Implications for the Persistent X-ray Emission and Spindown of the Soft Gamma Repeaters and Anomalous X-ray Pulsars
• An analysis of the timing irregularities for 366 pulsars
• Untwisting magnetospheres of neutron stars
• Magnetar-like Emission from the Young Pulsar in Kes 75
• On Young Neutron Stars as Propellers and Accretors with Conventional Magnetic Fields
• Discovery of a New Transient Magnetar Candidate: XTE J1810-197
• Grand Unification in Neutron Stars
• A unified model of the magnetar and radio pulsar bursting phenomenology
• The discovery, monitoring and environment of SGR J1935+2154
• 16 Years of RXTE Monitoring of Five Anomalous X-ray Pulsars
• The outburst decay of the low magnetic field magnetar SGR 0418+5729
• The Prelude to and Aftermath of the Giant Flare of 2004 December 27: Persistent and Pulsed X-ray Properties of SGR 1806-20 from 1993 to 2005
• The magnetar XTE J1810-197: variations in torque, radio flux density and pulse profile morphology
• Imaging X-ray, Optical, and Infrared Observations of the Transient Anomalous X-ray Pulsar XTE J1810-197
• The Quiescent Counterpart of the Soft Gamma-ray Repeater SGR 0526-66
• Large Torque Variations in Two Soft Gamma Repeaters
• A XMM-Newton View of the Soft Gamma-ray Repeater SGR 1806--20: Long Term Variability in the pre-Super Giant Flare Epoch
• Magnetars vs. high magnetic field pulsars: a theoretical interpretation of the apparent dichotomy
• Timing and Flux Evolution of the Galactic Center Magnetar SGR J1745-2900
• 3XMM J185246.6+003317: another low magnetic field magnetar
• Deep Chandra Observation of the Pulsar Wind Nebula Powered by the Pulsar J1846-0258 in the Supernova Remnant Kes 75
• The Spectral Evolution of Transient Anomalous X-ray Pulsar XTE J1810--197
• Fading of the Transient Anomalous X-ray Pulsar XTE J1810-197
• Radio disappearance of the magnetar XTE J1810-197 and continued X-ray timing
• Evidence for Free Precession in the Pulsar B1642-03
• From outburst to quiescence: the decay of the transient Anomalous X-ray Pulsar XTE J1810-197
• Magnetar-like X-ray Bursts from a Rotation Powered Pulsar, PSR J1119-6127
• The long-term post-outburst spin down and flux relaxation of magnetar Swift J1822.3$-$1606
• The wind nebula around magnetar Swift J1834.9-0846
• Discovery of the transient magnetar 3XMM J185246.6+003317 near supernova remnant Kesteven 79 with XMM-Newton
• The X-ray outburst of the Galactic Centre magnetar SGR J1745-2900 during the first 1.5 year
• RXTE Observations of Anomalous X-ray Pulsar 1E 1547.0-5408 During and After its 2008 and 2009 Outbursts
• An Energetic Magnetar in HESS J1713-381/CTB 37B
• Precise Chandra Localization of the Soft Gamma-ray Repeater SGR 1806-20
• XMM-Newton observations of CXOU J010043.1-721134: the first deep look at the soft X-ray emission of a magnetar
• SGR 1806-20 about two years after the giant flare: Suzaku, XMM-Newton and INTEGRAL observations
• Characterization of the Crab Pulsar's Timing Noise
• Quiescent state and outburst evolution of SGR 0501+4516
• X-Ray Timing, Spectroscopy and Photometry of the Anomalous X-Ray Pulsar Candidate CXOU J010043.1-721134
• Temporal and spectral evolution in X- and gamma-rays of magnetar 1E 1547.0-5408 since its October 2008 outburst: the discovery of a transient hard pulsed component after its January 2009 outburst
• The Sleeping Monster: NuSTAR observations of SGR 1806-20, 11 years after the Giant Flare
• Magnetar-like X-ray bursts suppress pulsar radio emission
• Identification of CXOU J171405.7-381031 as a New Magnetar with XMM-Newton
• XMM-Newton observations of SGR 1806-20 over seven years following the 2004 Giant Flare
• X-ray and radio observations of the magnetar Swift J1834.9-0846 and its dust-scattering halo
• The calm after the storm: XMM-Newton observation of SGR 1806-20 two months after the Giant Flare of 2004 December 27
• Chandra observations of SGR 1627-41 near quiescence
• Discovery of a Glitch in the Accretion Powered Pulsar SXP 1062
• The Timing Noise of PSR 0823+26, PSR 1706-16, PSR 1749-28, PSR 2021+51 and The Anomalous Braking Indices
• Suzaku Observations of SGR 1900+14 and SGR 1806-20
• Pulse Phase-coherent Timing and Spectroscopy of CXOU J164710.2-45521 Outbursts
• XMM-Newton observations of Soft Gamma-ray Repeaters
• Timing Noise in Pulsars and Magnetars and the Magnetospheric Moment of Inertia
• On the Cooling Trend of SGR 0526-66

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• Timing analysis of Swift J0243.6+6124 with NICER and Fermi/GBM during the decay phase of the 2017-2018 outburst
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