The Crab pulsar seen with Aqueye at Asiago Cima Ekar Observatory

Details The Crab pulsar seen with Aqueye at Asiago Cima Ekar Observatory The Crab pulsar seen with Aqueye at Asiago Cima Ekar Observatory

2010-12-06

arxiv.org/abs/1012.1242v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

11 pages, 3 figures. To appear in Advances in Space Research, volume 47(2) - January 15, 2011; first volume of the Galileo Spe

Scientific paper

10.1016/j.asr.2010.07.016

We are developing fast photon-counter instruments to study the rapid variability of astrophysical sources by time tagging photon arrival times with unprecedented accuracy, making use of a Rubidium clock and GPS receiver. The first realization of such optical photon-counters, dubbed Aqueye (the Asiago Quantum Eye), was mounted in 2008 at the 182cm Copernicus Observatory in Asiago. Aqueye observed the Crab pulsar several times and collected data of extraordinary quality that allowed us to perform accurate optical timing of the Crab pulsar and to study the pulse shape stability on a timescale from days to years with an excellent definition. Our results reinforce the evidence for decadal stability of the inclination angle between the spin and magnetic axis of the Crab pulsar. Future realizations of our instrument will make use of the Galileo Global Navigation Satellite System (GNSS) time signal.

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