Isolated neutron stars

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Presentation transcript:

Isolated neutron stars 仝号 南京大学天文系

Outline The observations Scattering in pulsar magnetospere The results Magnetars RRATs INSs Scattering in pulsar magnetospere The results

Radiation belt of a NS?

Anomalous X-ray pulsars Lack of evidence of binary companions Luminosity larger than the spin down power Periods in the 5-12s range Spin-down time scales of 10^3-10^5yrs No long term variability (NO!)

AXPs (II) Soft X-ray spectrum Absence of radio emission (In some cases) Associate with supernova remnants

Theory Magnetar 18颗

Consequences Magnetospheric plasma density 3 orders larger than the \rho_GJ Resonant cyclotron scattering (RCS)

RRATs 22颗

INSs 7颗

Spectrum of J1856 X-ray: Optical/UV excess: Distance: 140 pc Temperature: 63 eV Radius: 5.1 km Optical/UV excess: Temperature: 26 eV Radius: 21.2 km Distance: 140 pc

Electron blanket

Radiation belt of a NS?

Physical process Resonant cyclotron scattering

谢谢！

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