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

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.7312k&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #73.12; Bulletin of the American Astronomical Society, Vol. 28, p.947

Astronomy and Astrophysics

Astronomy

Scientific paper

We report OSSE observations of the bursting X-ray pulsar GRO J1744--28 made in December 1995 and January 1996 at hard X-ray energies > 35 keV. The pulse profile of the persistent (i.e. non-bursting) pulsar emission is fit 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 min and mean =~ 33 min. 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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