Comparison of the azimuthal flux distribution of the extended Lyα and X-ray emission. (a) PSF-subtracted map of the 0.5–2 keV Chandra X-ray image after subtracting the QSO’s PSF. Red contours show the Lyα SB levels as in Figure 3. Black wedges indicate the sectors used to construct the plot in panel (b). The latter shows the azimuthal distribution of the normalized flux in each 2″–5″ sector, shown as a function of the sector’s central angle. The red curve traces the extended Lyα emission, while the black curve represents the 0.5–2 keV X-ray emission.