HST ACS WFC images (in 2 of the 3 observed bands) centered around the position of source B, the brightest X-ray off-nuclear that is indicated with r = 0 5 dashed circles. The images were smoothed with a Gaussian with σ = 2 pixels (0 098). The edge of the WFC field of view is obvious in all images with only about ~1/2 of the Chandra source B circle covered. Detected optical sources tabulated in Table 1 are indicated with solid r = 0 2 circles.