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| magnetars | |
|---|---|
| Name | Magnetar |
| Caption | Artist's impression of a highly magnetized neutron star |
| Type | Neutron star subtype |
| Discovered | 1998 |
| Progenitor | Massive star core collapse |
| Mass | ~1.2–2.0 M☉ |
| Radius | ~10–14 km |
| Magnetic field | ~10^13–10^15 G |
| Rotation period | ~0.3–12 s |
| Notable | Soft Gamma Repeaters, Anomalous X-ray Pulsars |
magnetars are a rare, highly magnetized class of neutron stars characterized by extraordinary magnetic fields and distinctive high-energy transient behavior. They bridge observational categories such as Soft Gamma Repeater and Anomalous X-ray Pulsar and provide links to phenomena observed by missions like Compton Gamma Ray Observatory, Rossi X-ray Timing Explorer, and Neil Gehrels Swift Observatory. Magnetars are central to studies involving objects discovered in catalogs produced by Chandra X-ray Observatory, XMM-Newton, and Fermi Gamma-ray Space Telescope.
Magnetars occupy a niche in compact-object taxonomy alongside pulsars, binary pulsars, and millisecond pulsars, distinguished by magnetic fields inferred through timing and spectral analyses performed with instruments on INTEGRAL, BeppoSAX, and NICER. Their phenomenology includes short, intense bursts detected in surveys by BATSE and long-term variability cataloged by teams at Max Planck Institute for Astrophysics, Harvard-Smithsonian Center for Astrophysics, and European Space Agency. Magnetar research intersects with results from observatories like Hubble Space Telescope, Very Large Array, and Atacama Large Millimeter Array when studying counterparts and environments.
Leading formation scenarios connect magnetars to core collapse of massive stars in regions like those studied in Orion Nebula, Carina Nebula, and Cassiopeia A remnants, with progenitors invoked in population synthesis performed by groups at Cambridge University, Caltech, and University of Oxford. Models couple angular momentum transport and dynamo amplification similar to mechanisms discussed by researchers at Princeton University and Los Alamos National Laboratory, and consider fallback accretion investigated by teams at University of Tokyo and Kyoto University. Evolutionary pathways link magnetars to objects cataloged in supernova surveys conducted by Palomar Transient Factory and Zwicky Transient Facility, and to compact remnants in clusters such as Westerlund 1.
Measured properties derive from timing, spectral, and polarimetric studies by collaborations at Max Planck Institute for Radio Astronomy, Jodrell Bank Observatory, and CSIRO. Typical masses are comparable to those reported for neutron stars in Hulse–Taylor binary studies, radii constrained by work at MIT and University of California, Berkeley, and magnetic field strengths exceed values inferred for canonical pulsars discussed in publications from Princeton Plasma Physics Laboratory. Surface and magnetospheric compositions are analyzed with input from laboratories like Lawrence Livermore National Laboratory and theoretical groups at Institute for Advanced Study.
Bursting and persistent emission models invoke magnetic energy release through crustal stresses and magnetospheric reconnection studied in papers from Stanford University, Columbia University, and University of Chicago. Short hard bursts tie to processes analogous to solar flares observed by Solar and Heliospheric Observatory, while giant flares echo high-energy transients cataloged by Swift and Fermi LAT teams. Resonant cyclotron scattering and photon splitting in strong fields are developed in theoretical work at University of Arizona and Max Planck Institute for Plasma Physics.
Early identification of Soft Gamma Repeater activity emerged from data by Vela satellites and analyses by researchers at Los Alamos National Laboratory, with the magnetar model proposed by scientists at University of Tokyo and University of Cambridge to explain anomalous X-ray properties seen with ASCA and Ginga. Landmark events include the 1979 and 2004 giant flares examined by teams at NASA, JAXA, and ESA, and more recent radio detections following X-ray outbursts reported by groups at Parkes Observatory and Arecibo Observatory.
Compilations maintained by researchers at McGill University and observatory consortia list sources identified in surveys by Chandra, XMM-Newton, Fermi, Swift, and ground facilities such as Green Bank Observatory. Well-studied objects often referenced in the literature include sources in NGC 253 fields, central compact objects like those in Cassiopeia A, and candidates located near clusters such as Westerlund 1 and R136.
Numerical simulation efforts led by groups at Max Planck Institute for Astrophysics, Princeton University, and University of Illinois Urbana-Champaign explore magneto-thermal evolution, magnetic instabilities, and crust yielding using codes shared within collaborations involving LANL, CCS-INT, and supercomputing centers like Oak Ridge National Laboratory. Magnetohydrodynamic and particle-in-cell simulations connect to theoretical frameworks developed by researchers at Perimeter Institute and Kavli Institute for Theoretical Physics.
Magnetars influence studies of Galactic high-energy transients cataloged by INTEGRAL and Fermi, contribute to interpretations of fast radio bursts investigated by teams at Arecibo Observatory, CHIME and Parkes Observatory, and provide potential central engines for some events in surveys by Zwicky Transient Facility and Large Synoptic Survey Telescope. Their role intersects with research on supernova remnants monitored by VLA and ALMA, and with multi-messenger programs involving LIGO and VIRGO in scenarios linking compact-object activity to gravitational-wave transients.
Category:Neutron stars