Simultaneous absolute timing of the Crab pulsar at radio and optical wavelengths
| Autor: | A. Stankov, T.-M. Ho, Ismaël Cognard, Christian Erd, Peter Verhoeve, Didier D. E. Martin, J. A. Stuewe, Aaron Golden, Rita Schulz, T. Oosterbroek |
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| Rok vydání: | 2008 |
| Předmět: |
Physics
Superconductivity nebula Electromagnetic spectrum Crab Pulsar Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) Astrophysics::Instrumentation and Methods for Astrophysics FOS: Physical sciences Astronomy and Astrophysics Time resolution Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics stars : pulsars : individual : crab pulsar psr j0534+2200 Pulse (physics) Radio telescope Wavelength Space and Planetary Science emission ultraviolet time resolution Quantum tunnelling |
| Zdroj: | Astronomy & Astrophysics. 488:271-277 |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361:200809751 |
| Popis: | 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. Comment: 8 pages; accepted for publication in Astronomy and Astrophysics |
| Databáze: | OpenAIRE |
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