Phase-resolved spectral analysis of 4U 1901+03 during its outburst

Abstract

The high mass X-ray binary 4U 1901+03 was reported to have the pulse profile evolving with the X-ray luminosity and energy during its outburst in February-July 2003: the pulse peak changed from double to single along with the decreasing luminosity. We have carried out a detailed analysis on the contemporary phase-resolved energy spectrum of 4U 1901+03 as observed by Rossi X-ray Timing Explorer (RXTE). We find that, both the continuum and the pulse spectra are phase dependent. The optical depth derived from the pulse spectrum is in general larger than that from the continuum. Fe Ka emission line is only detected in the spectrum of the continuum and is missing in the pulse spectrum. This suggests an origin of Fe emission from the accretion disk but not the surface of the neutron star.

18 pages, 8 figures, accepted by ApJ

References in corpus (9)

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• Giant outburst of EXO 2030+375: pulse-phase resolved analysis of INTEGRAL data
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• Upper Limits on Pulsed Radio Emission from the 6.85 s X-ray Pulsar XTE J0103-728 in the Small Magellanic Cloud
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Cited by in corpus (8)

• Accretion regimes in the X-ray pulsar 4U 1901+03
• Pulse phase dependence of emission lines in the X-ray pulsar 4U 1626-67
• Switches between accretion structures during flares in 4U 1901+03
• Flares, Broadening of the Pulse frequency peak, and Quasi Periodic Oscillations in the Transient X-ray Pulsar 4U 1901+03
• Evolution of timing and spectral characteristics of 4U 1901+03 during its 2019 outburst using the Swift and NuSTAR observatories
• Timing and spectral properties of Be/Xray pulsar 4U 1901+03 during 2019 outburst
• The Modulating Optical Depth of Photoelectric Absorption Edge with Pulse Phase in Accretion-Powered X-ray Pulsars
• Spectral evolution of X-ray pulsar 4U 1901+03 during the 2019 outburst based on Insight-HXMT and NuSTAR observations