Pulsed thermal emission from the accreting pulsar XMMU J054134.7-682550
A. Manousakis, R. Walter, M. Audard, and T. Lanz

TL;DR
This study analyzes the spectral and temporal properties of the accreting pulsar XMMU J054134.7-682550 during a giant outburst, revealing insights into its accretion disk, magnetic field, and pulsar spin evolution.
Contribution
It provides the first detailed spectral and timing analysis of this pulsar during a giant outburst, constraining the accretion disk structure and magnetic field.
Findings
The spectrum fits include a cutoff powerlaw, cold disk, hot blackbody, and cyclotron line.
The inner accretion disk broadens to 75 km thickness.
The pulsar's spin period decreases significantly during the outburst.
Abstract
Aims. Soft X-ray excesses have been detected in several Be/X-ray binaries and interpreted as the signature of hard X-ray reprocessing in the inner accretion disk. The system XMMU J054134.7-682550, located in the LMC, featured a giant Type II outburst in August 2007. The geometry of this system can be understood by studying the response of the soft excess emission to the hard X-ray pulses. Methods. We have analyzed series of simultaneous observations obtained with XMM-Newton/EPIC-MOS and RXTE/PCA in order to derive spectral and temporal characteristics of the system, before, during and after the giant outburst. Spectral fits were performed and a timing analysis has been carried out. Spectral variability, spin period evolution and energy dependent pulse shapes are analysed. Results. The outburst (L_X = 3* 10^38 erg/s \approx L_EDD) spectrum could be modeled successfully using a cutoff…
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Taxonomy
TopicsPulsars and Gravitational Waves Research · Astrophysical Phenomena and Observations · Gamma-ray bursts and supernovae
