Periodic Emission from the Gamma-Ray Binary 1FGL J1018.6–5856

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Science  13 Jan 2012:
Vol. 335, Issue 6065, pp. 189-193
DOI: 10.1126/science.1213974

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  1. Fig. 1

    Power spectrum of the LAT weighted photon light curve (E > 100 MeV) of 1FGL J1018.6–5856. The power spectrum is oversampled by a factor of 4 relative to its nominal resolution. The red dashed line indicates the 16.6-day period; the blue dashed lines are the second, third, and fourth harmonics of this. The dashed black line is a fit to the continuum power. The inset shows the weighted photon light curve folded on the 16.6-day period.

  2. Fig. 2

    The orbital modulation of the flux and spectral indices of 1FGL J1018.6–5856 in the 0.1 to 10 GeV band as measured with the Fermi LAT. Γ0.1–1 and Γ1–10 are photon spectral indices for energies below and above 1 GeV, respectively, using a broken power-law model.

  3. Fig. 3

    Swift XRT x-ray (left) and UVOT-W1 (right) images of the region around 1FGL J1018.6–5856. The x-ray–optical counterpart is marked by an arrow near the center of both images. The LAT 95% confidence ellipses from the 1FGL (12) and 2FGL (29) catalogs are marked.

  4. Fig. 4

    X-ray (upper panel) and radio (lower panel) observations of 1FGL J1018.6–5856 folded on the orbital period. The x-ray data are from the Swift XRT and cover the energy range 0.3 to 10 keV. For the x-ray observations, the different colors indicate data taken from different 16.58-day orbital cycles. For the radio data, green diamonds indicate 9-GHz data and red circles 5.5-GHz data. The radio data are from the ATCA.