Long-term evolution of cyclotron line energy in an eclipsing pulsar 4U 1538-522

被引：4

作者：

Tamang, Ruchi ^{[1
]}

Ghising, Manoj ^{[1
]}

Tobrej, Mohammed ^{[1
]}

Rai, Binay ^{[1
]}

Paul, Bikash Chandra ^{[1
]}

机构：

[1] North Bengal Univ, Dept Phys, Darjeeling 734013, W Bengal, India

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 527卷 / 02期

关键词：

accretion; accretion discs; binaries: eclipsing; stars: neutron; pulsars: individual: 4U 1538-522; X-rays: binaries; X-RAY PULSARS; PHASE-RESOLVED SPECTROSCOPY; LUMINOSITY DEPENDENCE; RESONANT SCATTERING; MAGNETIC-FIELDS; TORQUE REVERSAL; GX; 304-1; SPIN-UP; ACCRETION; OUTBURST;

D O I：

10.1093/mnras/stad2907

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the timing and spectral analysis of the high-mass X-ray binary source 4U 1538-522 using Nuclear Spectroscopic Telescope Array (NuSTAR) observations. One of the observations partially covers the X-ray eclipse of the source along with eclipse ingress. The source is found to spin down at the rate of 0.163 +/- 0.002 syr(-1) between similar to 54973 and 58603 MJD. It is evident that at time similar to 58620 MJD, a torque reversal occurred; thereafter, the source exhibited a spin-up trend at the rate -(0.305 +/- 0.018) syr(-1) until 59275 MJD. A recent NuSTAR observation finds the pulse period of the source: (526.2341 +/- 0.0041) s. The pulse profile exhibits a transition from double-peaked to single-peaked nature above similar to 30 keV. We analysed the overall trend of the temporal evolution of fundamental cyclotron resonance scattering feature, E-cyc, incorporating recent NuSTAR measurements. Initially, during the time span similar to 50452.16-55270.8 MJD, the cyclotron line energy is found to increase at a rate of 0.11 +/- 0.03 keVyr(-1), which is further followed by a decrease at a rate -0.14 +/- 0.01 keVyr(-1) between 55270.8 and 59267 MJD. The combined measurements in the time span 50452.16-59267 MJD reveal that the cyclotron line energy is increasing linearly at a rate of 0.08 +/- 0.02 keVyr(-1).

引用

页码：3164 / 3173

页数：10

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