Observation of hard X-ray emission from GRO J1744-28 in the 20-200 keV band during declining phase

Details Observation of hard X-ray emission from GRO J1744-28 in the 20-200 keV band during declining phase Observation of hard X-ray emission from GRO J1744-28 in the 20-200 keV band during declining phase

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001adspr..28..337m&link_type=abstract

Advances in Space Research, Volume 28, Issue 2-3, p. 337-341.

Computer Science

1

Scientific paper

We report spectral measurements of the bursting X-ray pulsar GRO J1744-28, made during a balloon flight experiment using high sensitivity scintillation counter telescope operating in the 20-200 keV energy band. The observations were made on March 30th, 1997 near to fading away of the source during its second outburst in December 1996 to April 1997. The X-ray flux in the 25-100 keV energy range was a factor of 10 lower than the averaged flux during the burst. The continuum spectrum was found to be extremely hard and is best fitted with a power law of the form (dN)/(dE) = KE-α with spectral index α = 2.05 +/- 0.1 and is very different compared to the averaged burst spectrum. The form of the spectrum compares with the transient X-ray pulsating source 4U0535+26 during its quiescent phase. At a distance of 8 kpc, the observed source luminosity in hard X-rays is ~ 1037 erg s-1. The power law nature of the X-ray emission, close to fading of the source during the declining phase suggests that unpulsed emission arises in the accretion disk which gradually disappears.

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