The  ~14  ×  14 fragment of the VLT V (top-left) and R (top-middle) band optical, and Chandra 0.5–7 keV X-ray (left-bottom) images of the PSR J1048–5832 vicinity. The Chandra image is smoothed with a four-pixel Gaussian kernel. Colour-bars show brightness scales in 1000 counts in the optical and in counts in X-rays. The cross marks the X-ray position of the pulsar. White-dashed and black-dashed ellipses show its 1σ uncertainties in X-rays and two radio observations. Yellow contours in the R-band image are overlaid from the X-ray image to indicate the PWN structure. Optical sources overlapping with the error ellipses and X-ray PWN are labelled by numbers. Top-right: the observed colour–magnitude diagram of PSR J1048–5832 field stars. The stars labelled in the images are highlighted.