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

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          Abstract

          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 \(\mu\)s time resolution and at 2 GHz using the Nan\c{c}ay radio telescope with an instrument doing coherent dedispersion and able to record giant pulses data. We have studied the delay between the radio and optical pulse using simultaneously obtained data therefore reducing possible uncertainties present in previous observations. We determined the arrival times of the (mean) optical and radio pulse and compared them using the tempo2 software package. We present the most accurate value for the optical-radio lag of 255 \(\pm\) 21 \(\mu\)s and suggest the likelihood of a spectral dependence to the excess optical emission asociated with giant radio pulses.

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          Author and article information

          Journal
          23 June 2008
          Article
          10.1051/0004-6361:200809751
          0806.3634
          f25862cd-1ea9-442f-9303-cf2e0dfc2459

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          8 pages; accepted for publication in Astronomy and Astrophysics
          astro-ph

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