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
Reads0
Chats0
TLDR
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
More filters
Journal ArticleDOI
Dense nuclear matter and symmetry energy in strong magnetic fields
TL;DR: In this paper, the properties of nuclear matter in the presence of a strong magnetic field, including the density-dependent symmetry energy, the chemical composition and spin polarizations, are investigated in the framework of the relativistic mean field models FSUGold.
Journal ArticleDOI
Cosmic Influence on the Sun-Earth Environment.
TL;DR: SOHO satellite data reveals geophysical changes before sudden changes in the Earth's Sun-Earth environment, and the influence of extragalactic changes on the Sun as well as the Sun- Earth environment seems to be both periodic and episodic.
Journal ArticleDOI
SGR 1806–20 Is a Set of Independent Relaxation Systems
TL;DR: SGR 1806-20 produced patterns of bursts during its 1983 outburst that indicate multiple independent energy accumulation sites, each driven by a continuous power source, with sudden, incomplete releases of the accumulated energy as mentioned in this paper.
Journal ArticleDOI
Magnetar Giant Flares --- Flux Rope Eruptions in Multipolar Magnetospheric Magnetic Fields
TL;DR: In this paper, a self-consistent stationary, axisymmetric model of the magnetar magnetosphere is constructed based on a force-free magnetic field configuration which contains a helically twisted force free flux rope.
Journal ArticleDOI
Many-body forces in magnetic neutron stars
TL;DR: In this article, the effects of many-body forces on the equation of state and the structure of magnetic neutron stars were studied in a relativistic mean field formalism that takes into account manybody forces by means of a nonlinear meson field dependence on the nuclear interaction coupling constants.
References
More filters
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
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.