Hard X-Ray Spectroscopy and Pulsar Phase Analysis of the Bursting X-Ray Pulsar GRO J1744-28 with OSSE

Details Hard X-Ray Spectroscopy and Pulsar Phase Analysis of the Bursting X-Ray Pulsar GRO J1744-28 with OSSE Hard X-Ray Spectroscopy and Pulsar Phase Analysis of the Bursting X-Ray Pulsar GRO J1744-28 with OSSE

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...464l.131s&link_type=abstract

Astrophysical Journal Letters v.464, p.L131

Astronomy and Astrophysics

Astronomy

29

Gamma Rays: Observations, Stars: Neutron, X-Rays: Stars

Scientific paper

We report OSSE observations of the bursting X-ray pulsar GRO J1744-28 made in 1995 December and 1996 January at hard X-ray energies >35 keV. The pulse profile of the persistent (i.e., nonbursting) pulsar emission is fitted with a sinusoid in the energy range 35--90 keV. Residuals reveal a second harmonic amplitude of 3.0% +/- 0.5% of the fundamental. The distribution of time intervals between bursts measured in January is characterized by a broad flat-topped function with width ~=35 minutes and mean ~=33 minutes. The burst profile averaged over an ensemble of 104 bursts in the 35--60 keV energy range has FWHM width of 3.6 +/- 0.3 s and displays a factor of 2 faster rise time than decay and a pronounced dip in persistent emission after the burst. The phase of the sinusoidal pulse profile during bursts lags the phase prior to bursts by ~=90 ms (~=1.2 radians), and a 29 +/- 6 ms (0.39 +/- 0.08 radians) lag persists following the burst. There are no statistically significant spectral differences between the hard X-ray spectra of the bursting and persistent emission in the OSSE energy range, nor is there any evidence of annihilation or neutron capture line emission or cyclotron absorption.

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