Pulsar Music

For a more intuitive presentation of the newly discovered pulsars in 47 Tucanae, the pulsar signals were down sampled in frequency by a factor of 80 to produce audible waves. The sound volume varies proportionally to the pulse amplitudes in averaged pulse profile. The central tone of the “pulsar music” was set in C major and a tempo of 4/4. The chirp tune from high to low represents the time delay of the pulsar signals due to the dispersion when the signals are transmitting through the interstellar medium. The percussions are all produced from signals of other 47 Tucanae pulsars. The music presents an artistic view of the waves from the spinning neutron stars, J0024-7204aa and J0024-7204ab, twinkling in the distance 47 Tucanae Cluster, traveling through a glittering, translucent, and romantic starry night. (Music Producer: Yuan Mei)

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Averaged pulse profiles and positions of new pulsars. Left panel is an optical image from 12.5 inch telescope with exposure time 90 min. Registar counts 17,012 stars in this image. The top right panels are averaged pulse profile and intensity versus phase for PSR J0024−7204aa (left) and PSR J0024−7204ab (right). The lower panel is the positions of PSR J0024−7204ab (red point) and the other pulsars (blue point) of 47 Tucanae with known timing solutions. The positions of PSR J0024−7204aa is uncertain in terms of existing data.