Journal ArticleDOI
An X-ray pulsar with a superstrong magnetic field in the soft γ-ray repeater SGR1806 − 20
Chryssa Kouveliotou,Chryssa Kouveliotou,S. Dieters,S. Dieters,Tod E. Strohmayer,Tod E. Strohmayer,J. van Paradijs,Gerald J. Fishman,Charles A. Meegan,Kevin Hurley,Jefferson M. Kommers,Ian Smith,Dale A. Frail,Toshio Murakami +13 more
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In this paper, the authors reported the discovery of pulsations in the persistent X-ray flux of SGR1806-20, with a period of 7.47 s and a spindown rate of 2.6 x 10(exp -3) s/yr.Abstract:
Soft gamma-ray repeaters (SGRs) emit multiple, brief (approximately O.1 s) intense outbursts of low-energy gamma-rays. They are extremely rare; three are known in our galaxy and one in the Large Magellanic Cloud. Two SGRs are associated with young supernova remnants (SNRs), and therefore most probably with neutron stars, but it remains a puzzle why SGRs are so different from 'normal' radio pulsars. Here we report the discovery of pulsations in the persistent X-ray flux of SGR1806-20, with a period of 7.47 s and a spindown rate of 2.6 x 10(exp -3) s/yr. We argue that the spindown is due to magnetic dipole emission and find that the pulsar age and (dipolar) magnetic field strength are approximately 1500 years and 8 x 10(exp 14) gauss, respectively. Our observations demonstrate the existence of 'magnetars', neutron stars with magnetic fields about 100 times stronger than those of radio pulsars, and support earlier suggestions that SGR bursts are caused by neutron-star 'crust-quakes' produced by magnetic stresses. The 'magnetar' birth rate is about one per millenium, a substantial fraction of that of radio pulsars. Thus our results may explain why some SNRs have no radio pulsars.read more
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Journal ArticleDOI
Search for gamma-ray emission from magnetars with the Fermi Large Area Telescope
A. A. Abdo,A. A. Abdo,Markus Ackermann,Marco Ajello,Alice Allafort,Luca Baldini,Jean Ballet,Guido Barbiellini,Guido Barbiellini,Matthew G. Baring,Denis Bastieri,Denis Bastieri,Ronaldo Bellazzini,Roger Blandford,Elliott D. Bloom,Emanuele Bonamente,Emanuele Bonamente,A. W. Borgland,A. Bouvier,J. Bregeon,M. Brigida,M. Brigida,Pascal Bruel,T. H. Burnett,G. A. Caliandro,R. A. Cameron,P. A. Caraveo,Claudia Cecchi,Claudia Cecchi,Omer Celik,Omer Celik,Sylvain Chaty,A. Chekhtman,A. Chekhtman,C. C. Cheung,C. C. Cheung,James Chiang,Stefano Ciprini,R. Claus,Jan Conrad,Jan Conrad,P. R. den Hartog,Charles D. Dermer,A. De Angelis,F. de Palma,F. de Palma,Rim Dib,M. Dormody,E. Do Couto E Silva,Persis S. Drell,R. Dubois,D. Dumora,Teruaki Enoto,C. Favuzzi,C. Favuzzi,M. Frailis,P. Fusco,P. Fusco,F. Gargano,N. Gehrels,Nicola Giglietto,Nicola Giglietto,Paolo Giommi,Francesco Giordano,Francesco Giordano,Marcello Giroletti,T. Glanzman,G. Godfrey,I. A. Grenier,M.-H. Grondin,Sylvain Guiriec,D. Hadasch,Y. Hanabata,Alice K. Harding,E. Hays,G. L. Israel,Gudlaugur Johannesson,A. S. Johnson,V. M. Kaspi,Hideaki Katagiri,Jun Kataoka,Jürgen Knödlseder,M. Kuss,J. Lande,Shiu-Hang Lee,Marianne Lemoine-Goumard,Francesco Longo,Francesco Longo,F. Loparco,F. Loparco,M. N. Lovellette,P. Lubrano,P. Lubrano,A. Makeev,A. Makeev,M. Marelli,M. N. Mazziotta,Julie McEnery,Julie McEnery,J. Mehault,Peter F. Michelson,Tsunefumi Mizuno,A. A. Moiseev,A. A. Moiseev,C. Monte,C. Monte,M. E. Monzani,A. Morselli,Igor V. Moskalenko,S. Murgia,M. Naumann-Godo,P. L. Nolan,E. Nuss,T. Ohsugi,Akira Okumura,Nicola Omodei,E. Orlando,Jonathan F. Ormes,M. Ozaki,David Paneque,D. Parent,D. Parent,M. Pepe,M. Pepe,Melissa Pesce-Rollins,F. Piron,T. A. Porter,S. Rainò,S. Rainò,Riccardo Rando,Riccardo Rando,M. Razzano,Nanda Rea,A. Reimer,Olaf Reimer,T. Reposeur,Steven Ritz,Hartmut Sadrozinski,P. M. Saz Parkinson,Carmelo Sgrò,E. J. Siskind,David Stanley Smith,Gloria Spandre,P. Spinelli,P. Spinelli,M. S. Strickman,Hiromitsu Takahashi,Takaaki Tanaka,J. B. Thayer,D. J. Thompson,L. Tibaldo,Diego F. Torres,Diego F. Torres,Gino Tosti,Gino Tosti,A. Tramacere,Eleonora Troja,Yasunobu Uchiyama,T. L. Usher,Justin Vandenbroucke,V. Vasileiou,V. Vasileiou,Giacomo Vianello,V. Vitale,V. Vitale,A. P. Waite,Brian L Winer,K. S. Wood,Zhenwei Yang,M. Ziegler +169 more
TL;DR: In this article, the authors report on the search for 0.1-10 GeV emission from magnetars in 17 months of Fermi Large Area Telescope (LAT) observations and no significant evidence for gamma-ray emission from any of the currently known magnetars is found.
Journal ArticleDOI
Magnetic Field Generation in Stars
TL;DR: A review of recent work in this area can be found in this paper, where the authors look at the fossil field hypothesis which links magnetism in compact stars to magnetism of main sequence and pre-main sequence stars and consider why its feasibility has now been questioned particularly in the context of highly magnetic white dwarfs.
Journal ArticleDOI
INTEGRAL discovery of persistent hard X-ray emission from the Soft Gamma Ray Repeater SGR 1806-20
TL;DR: In this paper, the authors reported the discovery of persistent hard X-ray emission extending up to 150 keV from the soft gamma-ray repeater SGR 1806-20 using data obtained with the INTEGRAL satellite in 2003-2004.
Journal ArticleDOI
A QED Model for the Origin of Bursts from Soft Gamma Repeaters and Anomalous X-Ray Pulsars
TL;DR: In this article, the authors proposed a model to account for the bursts from soft gamma repeaters (SGRs) and anomalous X-ray pulsars (AXPs) in which quantum electrodynamics plays a vital role.
Journal ArticleDOI
Nonlinear Electrodynamics and the Surface Redshift of Pulsars
TL;DR: In this paper, it is argued that although the quoted observations are undisputed for canonical pulsars, they could be misidentified if the NS is endowed with a superstrong magnetic field (B) as are the so-called magnetars and strange quark magnetars, e.g., the spectral line discovered by Ibrahim and coworkers.
References
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Journal ArticleDOI
The soft gamma repeaters as very strongly magnetized neutron stars - I. Radiative mechanism for outbursts
Journal ArticleDOI
The Soft Gamma Repeaters as Very Strongly Magnetized Neutron Stars. II. Quiescent Neutrino, X-Ray, and Alfvén Wave Emission
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TL;DR: In this paper, the authors present a history of Neutron stars from early speculations to current problems, including the discovery of the first radio pulsar, the first detection of radio emissions from Pulsars, and the first measurement of the Vela Pulsar at MeV Energies at the PSR B0655+64.
Journal ArticleDOI
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