Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session X3: Magnetars |
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Sponsoring Units: DAP Chair: David Palmer, Los Alamos National Laboratory Room: Hyatt Regency Dallas Landmark C |
Tuesday, April 25, 2006 1:30PM - 2:06PM |
X3.00001: Magnetars Invited Speaker: A growing body of evidence has accumulated over the past 10 years that there is a class of Galactic neutron stars with magnetic field strengths of the order of $10^{15}$ G - the strongest known fields in the universe. These magnetars come in at least two classes, the soft gamma repeaters and the anomalous X-ray pulsars (SGRs and AXPs). I will review the observations of the SGRs, which sporadically emit short pulses of X-rays (energies up to $\sim$ 100 keV) and more rarely, giant flares with gamma-rays into the MeV range and the most intense fluxes ever observed at Earth. Studies of the SGRs suggest that they should be present and detectable in nearby galaxies, where they would appear to be short cosmic gamma-ray bursts. I will discuss the evidence that such a burst has been observed. [Preview Abstract] |
Tuesday, April 25, 2006 2:06PM - 2:42PM |
X3.00002: Fast X-ray Oscillations During Magnetar Flares Invited Speaker: We report on recent studies of high frequency variability during magnetar giant flares. These oscillations may represent the first observations of global shear oscillations in neutron star crusts, and can provide a new tools to study neutron star structure. [Preview Abstract] |
Tuesday, April 25, 2006 2:42PM - 3:18PM |
X3.00003: Solar physics of magnetars Invited Speaker: Two closely related types of neutron stars -- Anomalous X-ray Pulsars and Soft Gamma Ray Repeaters, commonly called magnetars -- posses magnetic field exceeding quantum critical fields. Dissipation of these fields powers persistent and bursting emission and produces occasionally giant flares. Using analogies with the Sun, I will describe magnetospheric structure of magnetars, the way magnetic dissipation can proceed in the relativistically strong regime and how giant flares, analogues of coronal mass ejections, may develop. Finally, I will discuss how the observed non-thermal spectra can be formed through resonant cyclotron scattering of surfaces radiation. [Preview Abstract] |
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