NuSTAR observation of X-ray pulsar 1E 1145.1-6141

Abstract

In this paper, we report on the hard X-ray observation of the X-ray pulsar 1E 1145.1-6141 performed with the Nuclear Spectroscopic Telescope Array mission (NuSTAR). The coherent pulsation of the source with a period of $\sim 296.653\pm 0.021s$ is detected. The source may be in the equilibrium phase, according to the most recent measurements of its pulse period. The pulse profile reveals a mild energy dependence and generally hints at a pencil-beam pattern. The pulse profile have evolved with time. The Pulse fraction is found to depend on energy with a fall in the value at $\sim 32keV$. The NuSTAR spectra can be approximated by a composite model with two continuum components, a blackbody emission, cut-off powerlaw, and a discrete component in the form of gaussian to account for the emission line of iron. The estimated absorbed flux of the source is $\sim 6\times 10^{-10}ergc{m}^{-2}{s}^{-1}$ which corresponds to a luminosity of $\sim 5\times 10^{36}erg{s}^{-1}$. Pulse phase-resolved spectroscopy were performed to understand the evolution of spectral parameters with pulse phase. The estimated blackbody radius is found to be consistent with the size of the theoretical prediction.

arXiv comment7 pages, 4 figures

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Cited by in corpus (2)

• Energy-resolved pulse profiles of accreting pulsars: Diagnostic tools for spectral features
• Catalog of the Galactic population of X-ray pulsars in High-mass X-ray binary systems