Fast spectroscopy of the 4 November 1978 gamma-ray burst

Barat, C.; Niel, M.; Hayles, R. I.; Hurley, K.; Védrenne, G.; Estulin, I. V.; Митрофанов, И. Г.; Dolidze, V. Sh.; Zenchenko, V. M.

doi:10.1016/0273-1177(84)90072-3

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…In practice, the QPOs have been discovered in the giant flares observed in soft-gamma repeaters (SGRs). At least, there are three events detected up to now, in which the QPOs are found, i.e., SGR 0526-66 in 1979 [98,99], SGR 1900+14 in 1998 [100], and SGR 1806-20 in 2004 [101,102]. In particular, in the events on SGR 1900+14 and SGR 1806-20, several QPOs are found [72][73][74], i.e., 28, 54, 84, and 155 Hz in SGR 1900+14, and 18, 26, 29 (or 30), 92.5, 150, 626.5, and 1837 Hz in SGR 1806-20.…”

Section: Magnetar Qpos and Magneitc Effects On The Crustal Oscillationsmentioning

confidence: 96%

Astrophysical implications of double-layer torsional oscillations in a neutron star crust as a lasagna sandwich

Sotani

Iida

Oyamatsu

2019

Monthly Notices of the Royal Astronomical Society

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In the crust of a neutron star, global torsional oscillations could occur in two elastic layers. The outer and inner layers are composed of spherical and cylindrical nuclei and of cylindrical holes (tubes) and spherical holes (bubbles), respectively, while between these two layers, a phase of slab-like (lasagna) nuclei with vanishingly small elasticity is sandwiched. In this work, we update systematic calculations of the eigenfrequencies of the fundamental oscillations in the inner layer by newly allowing for the presence of tubes. We find that the frequencies still depend strongly on the slope parameter of the nuclear symmetry energy, L, while being almost independent of the incompressibility of symmetric nuclear matter. We also find that the fundamental frequencies in the inner layer can become smaller than those in the outer layer because the tube phase has a relatively small shear modulus and at the same time dominates the inner layer in thickness. As a result, we can successfully explain not only the quasi-periodic oscillations originally discovered in the observed X-ray afterglow of the giant flare of SGR 1806-20 but also many others recently found by a Bayesian procedure.

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Section: Magnetar Qpos and Magneitc Effects On The Crustal Oscillationsmentioning

confidence: 96%

Astrophysical implications of double-layer torsional oscillations in a neutron star crust as a lasagna sandwich

Sotani

Iida

Oyamatsu

2019

Monthly Notices of the Royal Astronomical Society

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“…This suggestion is interesting given that magnetars appear to be associated with fairly regular flaring events [4]. If modes are excited in these systems, an indication of the energy released in the most powerful bursts is the 10 −9 M c 2 estimated for the 5 March 1979 burst in SGR 0526-66 [29]. However, if the main action leading to the energy emission is associated with the low-density crust one would not expect significant gravitational-wave emission.…”

Section: Transientsmentioning

confidence: 97%

A Gravitational-Wave Perspective on Neutron-Star Seismology

Andersson

2021

Universe

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We provide a bird’s-eye view of neutron-star seismology, which aims to probe the extreme physics associated with these objects, in the context of gravitational-wave astronomy. Focussing on the fundamental mode of oscillation, which is an efficient gravitational-wave emitter, we consider the seismology aspects of a number of astrophysically relevant scenarios, ranging from transients (like pulsar glitches and magnetar flares), to the dynamics of tides in inspiralling compact binaries and the eventual merged object and instabilities acting in isolated, rapidly rotating, neutron stars. The aim is not to provide a thorough review, but rather to introduce (some of) the key ideas and highlight issues that need further attention.

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Fast spectroscopy of the 4 November 1978 gamma-ray burst

Cited by 2 publications

References 8 publications

Astrophysical implications of double-layer torsional oscillations in a neutron star crust as a lasagna sandwich

Astrophysical implications of double-layer torsional oscillations in a neutron star crust as a lasagna sandwich

A Gravitational-Wave Perspective on Neutron-Star Seismology

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