Detection of Magnetospheric X-Ray Pulsation from the Millisecond Pulsar B1821-24

Details Detection of Magnetospheric X-Ray Pulsation from the Millisecond Pulsar B1821-24 Detection of Magnetospheric X-Ray Pulsation from the Millisecond Pulsar B1821-24

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997stin...9721704s&link_type=abstract

Technical Report, Tokyo Univ. Japan Research Center for the Early Universe

Astronomy and Astrophysics

Astrophysics

Pulsars, X Rays, Pulsar Magnetospheres, Energy Spectra, Photons, Emission Spectra, Spectrum Analysis, Spectrometers, Gamma Rays, Astronomical Satellites

Scientific paper

We report the first clear detection of X-ray pulsation of magnetospheric origin from a millisecond pulsar PSR B1821-24 with Advanced Satellite for Cosmology and Astrophysics (ASCA). The photon arrival time shows the periodicity of 3.05 ms period as observed in radio band. The observed X-ray pulse is double peaked. The pulses are characterized by a sharp temporal profile and hard power-law spectrum with a phase averaged photon index of approx. 1.9. These two features are quite similar to the X-ray/gamma-ray pulse from the Crab pulsar and characteristic of the non-thermal emission from the magnetosphere of the neutron star, but contradictable to the thermal emission from its surface. Since this pulsar has completely different physical parameters from those of young pulsars, we expect these observations to provide significant constraints to models of pulsars magnetospheric emission which have been developed mostly based on the observations of young pulsars.

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