High-precision timing observations of the millisecond pulsar PSR 1937 + 21

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Coordinates, Atomic Clocks, Gravitational Waves, Pulsars, Universe, Accuracy, Circular Polarization, Data Reduction, Flux Density, Interstellar Matter, Microwaves, Power Spectra

Scientific paper

Long-term studies of pulse arrival times for the pulsar PSR 1937+21 yield estimates of the pulsar's period, spin-down rate and celestial coordinates with unprecedented accuracies. Over periods exceeding six months, this pulsar is at least comparable in stability to the best man-made atomic clocks. The results place a limit on the energy density of low-frequency gravitational waves in the Universe.

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