SWIFT OBSERVATIONS OF 1FGL J1018.6–5856
- Department of Physics, McGill University, Rutherford Physics Building, Montreal, QC H3A 2T8 (Canada)
- Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States)
We report on X-ray properties of the gamma-ray binary 1FGL J1018.6–5856 using observations obtained with the Swift X-ray telescope. Using 54 observations made between MJD 55575 and 55984, we find that the X-ray flux is modulated at a period of 16.57 ± 0.11 days, which is consistent with previous reports based on gamma-ray data. We find that the X-ray maximum at phase 0 previously reported may not be a persistent feature of the source: the dramatic increases at phase 0 were only detected for ∼100 days and were not detected thereafter. Rather, the persistent sinusoidal maximum seems to be at phase 0.3-0.4, and is misaligned with the gamma-ray (GeV) peak. We also find evidence that the source's X-ray flux is correlated with the spectral hardness in the 0.5-10 keV band. Such a correlation has also been reported in the gamma-ray binaries LS 5039 and LS I +61°303 and can help us to understand the X-ray emission mechanisms of the sources.
- OSTI ID:
- 22270875
- Journal Information:
- Astrophysical Journal, Vol. 775, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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