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William E. Harris and Courtney J. Mulholland 2017 ApJ 839 102

HST photometry has revealed a population of intragalactic globular clusters (GCs) extending out to at least 500 kpc from the center of the Perseus Cluster; there may be 50,000 or more of these GCs.

L. Marcotulli et al 2017 ApJ 839 96

A multiwavelength study of three high-redshift blazars shows that inverse Compton scattering of low-energy photons supplied by the broad-line region can explain the X-ray and gamma-ray emission observed.

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