The anisotropy of the diffuse cosmic X-ray background

From the new data of the 2–60 keV diffuse X-ray background from HEAO-1 A2, model galactic component is subtracted to give the cosmic component. The greater intensity in the northern galactic hemipshere is shown to be probably due to the motion of the Sun relative to the background (the Compton-Getting effect). The derived degree of anisotropy is δ = (0.45 ± 0.18)% and the velocity is V = (397 ± 159) km/s. These values are consistent with the known anisotropy in the microwave background.