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The Crab pulsar seen with AquEYE at Asiago Cima Ekar observatory |
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| Authors: | L Zampieri C Germanà C Barbieri G Naletto A ?ade? I Capraro A Di Paola C Facchinetti T Occhipinti D Ponikvar E Verroi P Zoccarato |
| Institution: | 1. INAF-Astronomical Observatory of Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy;2. Astronomy Department, University of Padova, Vicolo dell’Osservatorio 2, 35122 Padova, Italy;3. Department of Information Engineering, University of Padova, Via Gradenigo 6/B, 35131 Padova, Italy;4. CNR/INFM/LUXOR, Via Gradenigo 6/B, 35131 Padova, Italy;5. Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia;6. INAF-Astronomical Observatory of Rome, Via Frascati 33, 00040 Monteporzio Catone (Roma), Italy;g Interdipartimental Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, Italy |
| Abstract: | 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 182 cm 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. |
| Keywords: | Pulsars: general Pulsars: individual PSR J0534+2200 (Crab pulsar) Pulsar timing |
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