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
Citations
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Journal ArticleDOI
A Burst and Simultaneous Short-Term Pulsed Flux Enhancement From The Magnetar Candidate 1E 1048.1-5937
TL;DR: In this article, the authors reported on the 2004 June 29 X-ray burst detected from the direction of the AXP 1E 1048.1-5937 using the RXTE.
Journal ArticleDOI
Magnetized color flavor locked state and compact stars
TL;DR: In this article, the stability of the color flavor locked phase in the presence of a strong magnetic field was investigated within the phenomenological MIT bag model, taking into account the variation of the strange quark mass, the baryon density, the magnetic field, as well as the bag and gap parameters.
Journal ArticleDOI
Constraints on the nuclear equation of state and the neutron star structure from crustal torsional oscillations
TL;DR: In this article, the authors examined torsional shear oscillations of neutron star crusts by taking into account the possible presence of the phase of cylindrical nuclei.
Journal ArticleDOI
The 2001 April Burst Activation of SGR 1900+14: X-Ray Afterglow Emission
Marco Feroci,Sandro Mereghetti,P. M. Woods,P. M. Woods,Chryssa Kouveliotou,Chryssa Kouveliotou,Enrico Costa,D. D. Frederiks,S. V. Golenetskii,Kevin Hurley,E. P. Mazets,Paolo Soffitta,Marco Tavani +12 more
TL;DR: In this article, the authors present an analysis of the data from this and from a subsequent BeppoSAX observation, as well as from a set of RXTE observations, most likely related to the large hard X-ray flare.
Journal ArticleDOI
Influence of an Internal Magnetar on Supernova Remnant Expansion
TL;DR: In this paper, it was shown that a faster expansion results when the energy injected into the supernova remnant by magnetar spin-down is taken into account, thus helping to improve the matches between characteristic ages and supernova residual ages.
References
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The soft gamma repeaters as very strongly magnetized neutron stars - I. Radiative mechanism for outbursts
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The Soft Gamma Repeaters as Very Strongly Magnetized Neutron Stars. II. Quiescent Neutrino, X-Ray, and Alfvén Wave Emission
TL;DR: In this article, the decay rate of the core field is a very strong function of temperature and therefore of the magnetic flux density, which is not present in the decay of the weaker fields associated with ordinary radio pulsars.
Book
Theory of Neutron Star Magnetospheres
TL;DR: The theory of neutron star magnetospheres is presented with reference to the most important observational data on neutron stars available to date in this paper, where attention is given to the nature of pulsars and pulsar properties and statistics; phenomenological models; aligned rotator and oblique rotator models; the disk models; alternative models; and radio emission models.
BookDOI
The many faces of neutron stars
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
Observations of a flaring X-ray pulsar in Dorado
TL;DR: In this article, the γ-ray burst detector Konus was used to detect hard X-ray bursts from the same source on 5 and 6 March, 1979, and the burst of 5 March was very intense, particularly in the initial phase and the second burst on 6 March was considerably weaker.