How is a Neutron Star identified if it manifests as a Pulsar within an SNR?
By emitting beams of electromagnetic radiation that sweep across space, detected as precise, timed pulses.
When a neutron star possesses a strong magnetic field and spins rapidly, it is classified as a pulsar. This rapid rotation causes the powerful magnetic field to generate focused beams of electromagnetic radiation, often in the radio wave portion of the spectrum, originating from its magnetic poles. If the orientation of these beams happens to sweep past Earth’s line of sight as the star rotates, observers detect a highly regular, precise pulse of radiation. This rhythmic detection serves as direct, observable evidence confirming the presence and activity of the compact stellar remnant located within the diffuse supernova remnant cloud.

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What Is Left After A Supernova? - Physics Frontier - YouTube