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
The Five Year Fermi/GBM Magnetar Burst Catalog
Andrew C. Collazzi,Chryssa Kouveliotou,Chryssa Kouveliotou,A. J. van der Horst,George Younes,George Younes,Yuki Kaneko,Ersin Gogus,Lin Lin,Jonathan Granot,Mark H. Finger,Vandiver Chaplin,Daniela Huppenkothen,Anna L. Watts,A. von Kienlin,Matthew G. Baring,David Gruber,P. N. Bhat,Melissa Gibby,Neil Gehrels,J. McEnery,M. van der Klis,Ralph A. M. J. Wijers +22 more
TL;DR: The Fermi/GBM magnetar catalog as mentioned in this paper covers the first five years of GBM magnetar observations, from July 2008 to June 2013, and provides durations, spectral parameters, fluences and peak fluxes for all the bursts, as well as detailed temporal analysis for SGR J1550-5418 bursts.
Journal ArticleDOI
Tidal deformability of an anisotropic compact star: Implications of GW170817
TL;DR: In this paper, anisotropic pressure in neutron stars can reduce their tidal deformability substantially, and it is shown that this reduction in spherical neutron stars with masses in the range of 1 to 2 can be 23% to 46%.
Journal ArticleDOI
Neutral and charged pion properties under strong magnetic fields in the NJL model
TL;DR: In this article, the effect of an intense external uniform magnetic field on neutral and charged pion masses and decay form factors was studied in the Nambu-Jona-Lasino (NJL) model.
Journal ArticleDOI
Spatial, temporal, and spectral properties of x-ray emission from the magnetar SGR 0501+4516
TL;DR: In this article, the authors reported the most accurate location of SGR 0501+4516 (with an accuracy of 1 1) derived with Chandra using the combined RXTE, Swift/X-ray Telescope, Chandra, and XMM-Newton observations, and constructed a phase-connected timing solution with the longest time baseline (~240 days) to date.
Journal ArticleDOI
Magnetic lensing near ultramagnetized neutron stars
TL;DR: In this paper, it was shown that the thermal emission of neutron stars with extremely strong magnetic fields is polarized, up to a few per cent for the largest fields known, which potentially allows a direct method for measuring their magnetic fields.
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.