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Simultaneous Absolute Timing of the Crab Pulsar at Radio and Optical Wavelengths.pdf

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Simultaneous Absolute Timing of the Crab Pulsar at Radio and Optical Wavelengths

a r X i v : 0 8 0 6 .3 6 3 4 v 1 [ a s t r o - p h ] 2 3 J u n 2 0 0 8 Astronomy Astrophysics manuscript no. 9751 c? ESO 2008 June 23, 2008 Simultaneous Absolute Timing of the Crab Pulsar at Radio and Optical Wavelengths T. Oosterbroek 1 , I. Cognard 2 , A. Golden 3 , P. Verhoeve 1 , D.D.E. Martin 1 , C. Erd 1 , R. Schulz 4 , J.A. Stu?we 5 , A. Stankov 1 , and T. Ho 4 1 Advanced Studies and Technology Preparation Division, Science Directorate of the European Space Agency, ESTEC-ESA, P.O. Box 299, 2200 AG, Noordwijk, The Netherlands e-mail: toosterb@ 2 Laboratoire de Physique et Chimie de l’Environnement, CNRS, 3A avenue de la Recherche Scientifique, F-45071 Orleans, France 3 Computational Astrophysics Laboratory, I.T. Building, National University of Ireland, Galway, Ireland 4 Research and Scientific Support Department of ESA, ESTEC, P.O. Box 299, 2200 AG Noordwijk, The Netherlands 5 Sterrewacht Leiden, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands Received March 6, 2008; accepted June 23, 2008 ABSTRACT Context. The Crab pulsar emits across a large part of the electromagnetic spectrum. Determining the time delay between the emission at different wavelengths will allow to better constrain the site and mechanism of the emission.We have simultaneously observed the Crab Pulsar in the optical with S-Cam, an instrument based on Superconducting Tunneling Junctions (STJs) with μs time resolution and at 2 GHz using the Nanc?ay radio telescope with an instrument doing coherent dedispersion and able to record giant pulses data. Aims. We have studied the delay between the radio and optical pulse using simultaneously obtained data therefore reducing possible uncertainties present in previous observations. Methods. We determined the arrival times of the (mean) optical and radio pulse and compared them using the tempo2 software package. Results. We present the most accurate value for the optical-radio lag of 255±21 μs and suggest the likelihood of a spectral dependence