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Fig. 1.


NuSTAR image in equatorial coordinates of the W1835 field in the energy range 3–24 keV (FPMA and FPMB were coadded in order to increase the signal-to-noise ratio). The blue solid 20 arcsec radius circular aperture reports the position of the hot DOG. Red dashed circles report the regions (30 arcsec radius) centered at the position of all the XMM-Newton- detected sources in the field (except for W1835) that were removed during the background-modeling procedure. The image was smoothed with a Gaussian kernel of 4 pixels (i.e., 10 arcsec) for better visualization. The color bar reports count/pixel values.

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