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24 April 2024

» arxiv » 1505.2096

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Broadband X-ray Properties of the Gamma-ray Binary 1FGL J1018.6-5856
Hongjun An ; Eric Bellm ; Varun Bhalerao ; Steven E. Boggs ; Finn E. Christensen ; William W. Craig ; Felix Fuerst ; Charles J. Hailey ; Fiona A. Harrison ; Victoria M. Kaspi ; Lorenzo Natalucci ; Daniel Stern ; John A. Tomsick ; William W. Zhang ;
Date:	8 May 2015
Abstract:	We report on NuSTAR, XMM-Newton and Swift observations of the gamma-ray binary 1FGL J1018.6-5856. We measure the orbital period to be 16.544+/-0.008 days using Swift data spanning 1900 days. The orbital period is different from the 2011 gamma-ray measurement which was used in the previous X-ray study of An et al. (2013) using ~400 days of Swift data, but is consistent with a new gamma-ray solution reported in 2014. The light curve folded on the new period is qualitatively similar to that reported previously, having a spike at phase 0 and broad sinusoidal modulation. The X-ray flux enhancement at phase 0 occurs more regularly in time than was previously suggested. A spiky structure at this phase seems to be a persistent feature, although there is some variability. Furthermore, we find that the source flux clearly correlates with the spectral hardness throughout all orbital phases, and that the broadband X-ray spectra measured with NuSTAR, XMM-Newton, and Swift are well fit with an unbroken power-law model. This spectrum suggests that the system may not be accretion-powered.
Source:	arXiv, 1505.2096
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