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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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
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Journal ArticleDOI
The Spin Period, Luminosity and Age Distributions of Anomalous X-Ray Pulsars
Pinaki Chatterjee,Lars Hernquist +1 more
TL;DR: In this paper, the authors considered the accretion model for anomalous X-ray pulsars, where the emission is powered by accretion from a fossil disk formed by the fallback of material from a supernova explosion.
Journal ArticleDOI
Astrophysics in 1998
TL;DR: From Alpha (Orionis and the parameter in mixing-length theory) to Omega (Centauri and the density of the universe), the Greeks had a letter for it as mentioned in this paper.
Journal ArticleDOI
Spatial, Temporal and Spectral Properties of X-ray Emission from the Magnetar SGR~0501+4516
TL;DR: In this paper, a phase connected timing solution with the longest time baseline (~240 days) to date for the SGR~0501+4516 source was derived with Chandra and XMM-Newton observations.
Journal ArticleDOI
Rapid Spectral Variability of a Giant Flare from a Magnetar in NGC 253
Oliver J. Roberts,Péter Veres,Matthew G. Baring,Michael S. Briggs,Chryssa Kouveliotou,Elisabetta Bissaldi,Elisabetta Bissaldi,George Younes,S. I. Chastain,J. J. DeLaunay,Daniela Huppenkothen,A. Tohuvavohu,P. N. Bhat,Ersin Gogus,A. J. van der Horst,J. A. Kennea,Dale D. Kocevski,J. D. Linford,Sylvain Guiriec,Sylvain Guiriec,Rachel Hamburg,Colleen A. Wilson-Hodge,Eric Burns +22 more
TL;DR: Observations of the γ-ray burst GRB 200415A have a rapid onset, very fast time variability, flat spectra and substantial sub-millisecond spectral evolution, which match well with those expected for a giant flare from an extragalactic magnetar.
Dissertation
Cosmic lighthouses at high redshift: intervening material in sight-lines towards grbs and qsos
TL;DR: In this regard, the recent construction of 8-10 m telescopes, together with the development of CCD devices have allowed us to observe the Universe in a much deeper way, or what is the same, observe it when it was very young as mentioned in this paper.
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
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.