The strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars

Abstract

Two classes of X-ray pulsars, the Anomalous X-ray Pulsars and the Soft Gamma-ray Repeaters, have been recognized in the last decade as the most promising candidates for being magnetars: isolated neutron stars powered by magnetic energy. I review the observational properties of these objects, focussing on the most recent results, and their interpretation in the magnetar model. Alternative explanations, in particular those based on accretion from residual disks, are also considered. The possible relations between these sources and other classes of neutron stars and astrophysical objects are also discussed.

Submitted to Astromomy and Astrophysics Review (57 pages, 19 figures, 6 tables)

References in corpus (60)

• Physics of Strongly Magnetized Neutron Stars
• Transient pulsed radio emission from a magnetar
• Short Duration Gamma-Ray Bursts with Extended Emission from Proto-Magnetar Spin-Down
• Corona of Magnetars
• A Debris Disk Around An Isolated Young Neutron Star
• The Magnificent Seven: Magnetic fields and surface temperature distributions
• 1E 1547.0-5408: a radio-emitting magnetar with a rotation period of 2 seconds
• Magnetar-like Emission from the Young Pulsar in Kes 75
• Discovery of luminous pulsed hard X-ray emission from anomalous X-ray pulsars 1RXS J1708-4009, 4U 0142+61 and 1E 2259+586 by INTEGRAL and RXTE
• Supernova remnant energetics and magnetars: no evidence in favour of millisecond proto-neutron stars
• Relativistic Jets and Long-Duration Gamma-ray Bursts from the Birth of Magnetars
• A downward revision to the distance of the 1806-20 cluster and associated magnetar from Gemini near-Infrared spectroscopy
• 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 1E 1547.0-5408: radio spectrum, polarimetry, and timing
• A long-period, violently-variable X-ray source in a young SNR
• X-ray spectra from magnetar candidates. I. Monte Carlo simulations in the non-relativistic regime
• Magnetars as persistent hard X-ray sources: INTEGRAL discovery of a hard tail in SGR 1900+14
• Distances to Anomalous X-ray Pulsars using Red Clump Stars
• The Compact X-ray Source 1E 1547.0-5408 and the Radio Shell G327.24-0.13: A New Proposed Association between a Candidate Magnetar and a Candidate Supernova Remnant
• Resonant Compton Upscattering in Anomalous X-ray Pulsars
• Recent Progress on Anomalous X-ray Pulsars
• INTEGRAL survey of the Cassiopeia region in hard X rays
• On the Possibility of Identification of a Short/Hard Burst GRB 051103 with the Giant Flare from a Soft Gamma Repeater in the M81 Group of Galaxies
• Infrared Echoes near the Supernova Remnant Cassiopeia A
• The variable radio-to-X-ray spectrum of the magnetar XTE J1810-197
• Polarized radio emission from the magnetar XTE J1810-197
• The distance and neutral environment of the massive stellar cluster Westerlund 1
• Outburst of the 2 s Anomalous X-ray Pulsar 1E 1547.0-5408
• Discovery of Pulsations and a Possible Spectral Feature in the X-ray Emission from Rotating Radio Transient J1819-1458
• Giant Flare in SGR 1806-20 and Its Compton Reflection from the Moon
• The Distance and Age of the SNR Kes 73 and AXP 1E 1841-045
• Exciting the Magnetosphere of the Magnetar CXOU J164710.2-455216 in Westerlund 1
• Anomalous X-ray pulsars: Persistent States with Fallback Disks
• Precise Timing of the X-ray Pulsar 1E 1207.4-5209: A Steady Neutron Star Weakly Magnetized at Birth
• The Anatomy of a Magnetar: XMM Monitoring of the Transient Anomalous X-ray Pulsar XTE J1810-197
• The first XMM-Newton observations of the Soft Gamma-ray Repeater SGR 1900+14
• X-ray and Near-IR Variability of the Anomalous X-ray Pulsar 1E 1048.1-5937: From Quiescence Back to Activity
• The superflares of soft Gamma-ray repeatres: giant quakes in solid quark stars?
• SGRs in nearby galaxies: rate, luminosity function and fraction among short GRBs
• Hard X-ray emission from Eta Carinae
• The Magnetar Nature and the Outburst Mechanism of a Transient Anomalous X-ray Pulsar
• X-ray Timing of PSR J1852+0040 in Kesteven 79: Evidence of Neutron Stars Weakly Magnetized at Birth
• Very deep X-ray observations of the Anomalous X-ray Pulsar 4U 0142+614
• 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
• Search for radio pulsations in four Anomalous X-ray Pulsars and discovery of two new pulsars
• XMM-Newton observation of the Soft Gamma Ray Repeater SGR 1627-41 in a low luminosity state
• AXPs/SGRs: Magnetars or Quark-stars?
• Spectral modelling of the high energy emission of the magnetar 4U 0142+614
• Adaptive optics near-infrared observations of magnetars
• Radio pulsars as progenitors of AXPs and SGRs: magnetic field evolution through pulsar glitches
• On the X-Ray Light Curve, Pulsed-Radio Emission, and Spin Frequency Evolution of the Transient Anomalous X-Ray Pulsar Xte J1810--197 During its X-Ray Outburst
• Linking the X-ray timing and spectral properties of the glitching AXP 1RXS J170849-400910
• Structure of the interstellar medium around Cas A
• Five years of SGR 1900+14 observations with BeppoSAX
• Optical/Infrared Observations of the Anomalous X-ray Pulsar 1E 1048.1-5937 During Its 2007 X-Ray Flare
• Long term hard X-ray variability of the anomalous X-ray pulsar 1RXS J170849.0-400910 discovered with INTEGRAL
• The infrared counterpart to the magnetar 1RXS J170849.0-400910
• What do exotic equations of state have to offer?
• A search for the optical counterpart to the magnetar CXOU J010043.1-721134

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