CALTECH AY 125 - Magnetars X-­ray Binaries­ I

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Magnetars. X-ray Binaries-I.PowerPoint PresentationSlide 3ReviewsSlide 5Giant Burst of August 1998Slide 7Slide 8Anomalous X-ray PulsarsSlide 10Slide 11ConclusionsWhy are magnetars of some interest?Magnetars. X-ray Binaries-I.Diagram from 1994Magnetars, High B field Pulsars unknown!From Kaplan (PhD 2004)This is a P-Pdot diagram and not B-PBut B2 proportional to P x PdotReviewsThere are no major reviews but try the following:•Kaspi (astroph/0402175)•Hurley (astroph/9912061)•Paczynski (1992, Acta Astronomica)•Baring (1991, A&A)The classic set of papers in this field are •Thompson & Duncan (1995, MNRAS)•Thompson & Duncan (1996, ApJ)Giant Burst from SGR 1900+14 (August 1998)Giant Burst of August 1998•Peak Luminosity of short spike, 1045 erg/s •Energy in the hard spike, 1044 erg•Total Energy radiated, 1045 erg (not including neutrinos)The luminosity exceeds LEddingtonA strong B field reduces Thomson cross-sectionPaczynski 1992where the cyclotron energyQED effects become important for BQED > 4.3x1013 G (electron rest mass)and photons with energy of 511 keVHurleyAnomalous X-ray Pulsars•Periods in the range 5-20 s•No companion (either through reflex motion or as optical/IR counterpart)•Luminous X-ray sources (4U 0142+64)•But Pdot not sufficient to power LX (see Table)•Hence the nameBursts from 1E2259+586KaspiConclusions•Soft gamma-ray repeaters and anomalous X-ray pulsars are highly magnetized neutron stars•The relationship between the two classes is unknown (is one descendent of the other?)•High B field radio pulsars (1014 G) appear to be different from magnetars. Something in the interior does care about 1014 G.Why are magnetars of some interest?•Some have argued that the birth (hot convective core) results in a magnetar. In any case at least magnetars constitute about 10% of the birthrate.•Magnetars have been suggested to be the central sources for GRBs•Exotic QED Phenomena (Photon splitting & Vacuum Polarization; see Baring


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CALTECH AY 125 - Magnetars X-­ray Binaries­ I

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