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Geminga's Tails: A Pulsar Bow Shock Probing the Interstellar Medium

Caraveo, P. A.; Bignami, G. F.; Mereghetti, S. +5 more

We report the X-ray Multimirror Mission-Newton European Photon Imaging Camera observation of two elongated parallel x-ray tails trailing the pulsar Geminga. They are aligned with the object's supersonic motion, extend for ~2', and have a nonthermal spectrum produced by electron-synchrotron emission in the bow shock between the pulsar wind and the …