A Suzaku View of Accretion Powered X-ray Pulsar GX 1+4

Abstract

We present results obtained from a Suzaku observation of the accretion powered X-ray pulsar GX 1+4. Broad-band continuum spectrum of the pulsar was found to be better described by a simple model consisting of a blackbody component and an exponential cutoff power-law than the previously used compTT continuum model. Though the pulse profile had a sharp dip in soft X-rays ($<$10 keV), phase-resolved spectroscopy confirmed that the dimming was not due to increase in photoelectric absorption. Phase-sliced spectral analysis showed the presence of a significant spectral modulation beyond 10 keV except for the dip phase. A search for the presence of cyclotron resonance scattering feature in the Suzaku spectra yielded a negative result. Iron K-shell (K${}_{\alpha }$ and K${}_{\beta }$) emission lines from nearly neutral iron ions ($<$Fe III) were clearly detected in the source spectrum. A significant K${}_{\alpha }$ emission line from almost neutral Ni atoms was detected for the first time in this source. We estimated the iron abundance of $\sim$80 % of the solar value and Ni/Fe abundance ratio of about two times of the solar value. We searched for a iron Ly${}_{\alpha }$ emission line and found a significant improvement in the spectral fitting by inclusion of this line.

arXiv comment19 pages, 12 figures, 4 tables

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• K2 & TESS observations of symbiotic X-ray binaries: GX 1+4 and IGR J16194-2810
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• A curious case of the accretion-powered X-ray pulsar GX 1+4
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• The Intensity Modulation of Fluorescent Line by a Finite Light Speed Effect in Accretion-Powered X-ray Pulsars
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• Studies of Cepheus X-4 during 2018 outburst observed with AstroSat