Extended Data Fig. 2: The far-UV continuum and driving light curves.
From: A persistent ultraviolet outflow from an accreting neutron star binary transient
The black histogram shows the light curve of Swift J1858.6−0814 constructed from three broad wavelength regions that exclude the three strongest emission lines (N v λ1240, Si iv λ1400 and He ii λ1640). The specific regions used were λλ1290 Å – 1390 Å, 1410 Å – 1630 Å, 1660 Å – 1850 Å. The light curve is shown normalized to an estimate of the underlying constant level (80 c s−1). The driving light curve used in the decomposition, D(t), was constructed from this and is shown as the red curve. It was obtained by subtracting the estimate of the constant level, setting any slightly negative values to zero, and using a 5-point, 2nd order Savitzky-Golay filter to produce a slightly smoother, higher S/N version of the light curve.
