期刊
ASTROPHYSICAL JOURNAL
卷 806, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/806/2/166
关键词
binaries: close; gamma rays: stars; stars: individual (1FGL J1018.6-5856); X-rays: binaries
资金
- NASA [NNG08FD60C, NAS5-00147]
- National Aeronautics and Space Administration
- Kavli Institute for Particle Astrophysics and Cosmology (KIPAC)
- ASI/INAF [I/037/12/0-011/13]
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. using similar to 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.
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