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Evidence is presented for the existence of extended X-ray halos around several X-ray clusters. Data were analyzed from the 0.5 x 5 deg and the 5 x 5 deg collimators on the Uhuru satellite. Measured cluster intensities were compared with those detected by OSO 8 and Ariel 5 experiments. Higher counting rates for larger fields of view indicate extended X-ray emission. The implications are discussed with respect to the mass of the cluster gas and for models of supercluster X-ray emission.
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Forman et al. (1978) studied this question.
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