RX J185635-3754: The Hubble Space Telescope Observation

HST F300W and F606W images. The HST observation consists of dithered pair of images (4400 seconds) in the wide-V (F606W) filter, and a 2400 second wide-U (F300W) image. The central 400 X 400 pixels (17.7 X 17.5 arcsec) of the planetary camera images are plotted. The arrow at the lower right of the F606W image points north.Both images are heavily stretched to bring out the faint features. The data were reduced using the WFPC2 team reduction method, which includes application of a high signal-to-noise superdark frame composed of dark frames taken as near as possible in time to the date of the observations, as well as an updated warm pixel correction for highly time-dependent dark current by using a delta (local) dark frame. All images were CR-SPLIT to facilitate cosmic-ray removal. The CR-SPLIT exposures were co-added using the VISTA "PICCRS" package. Final cosmic ray identification was done by blinking the split exposures in each filter. Residual cosmic rays were hand-cleaned only in the vicinity of the neutron star; they are evident elsewhere in the images. The dithered F606W frames were co-added using a simple adaptation of the Fruchter & Hook "drizzling" algorithm; we employed a 2X2 oversampling and a drop size of 1X1 oversampled pixels.

We identified the marked object as the optical counterpart. Its properties are:

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