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Unusual infrared emission toward Sgr B2: possible planar C₂₄

Li, Aigen; Xiang, Fu-Yuan; Yang, Xue-Juan +1 more

Interstellar graphene could be present in the interstellar medium (ISM), resulting from the photochemical processing of polycyclic aromatic hydrocarbon (PAH) molecules and/or collisional fragmentation of graphitic particles. Indeed, by comparing the observed ultraviolet (UV) extinction and infrared (IR) emission of the diffuse ISM with that predic…