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Low frequency pulsar observations with the international LOFAR station FR606

Abstract : The pulsar's signal passes through the interstellar medium (ISM) which leads to both chromatic dispersive delays and multipath pulse broadening. These effects have a strong frequency dependence (f-2 and f-4 respectively). Pulse profiles of pulsars are also frequency-dependent leading to some degeneracy with the ISM imprint. Furthermore, many pulsars show a turnover of their spectrum around ~100 MHz. For all these reasons, the frequency band below 100 MHz contains a lot of information about both the pulsar emission and the ISM. Our study is based on a LOw Frequency ARray (LOFAR) monitoring campaign using the international station FR606. Firstly, we demonstrate the importance of a monitoring campaign. Secondly, we calculate median spectra and locate the turnover frequency for 3 pulsars (B0809+74, B1133+16, B1508+55).
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Submitted on : Friday, February 11, 2022 - 2:34:21 PM
Last modification on : Wednesday, May 11, 2022 - 12:44:05 PM

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Louis Bondonneau, Jean-Mathias Griessmeier, Gilles Theureau, Maciej Serylak. Low frequency pulsar observations with the international LOFAR station FR606. Pulsar Astrophysics the Next Fifty Years, 2018, à renseigner, Unknown Region. pp.313-314, ⟨10.1017/S1743921317009656⟩. ⟨insu-03566308⟩

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