Details

Autor(en) / Beteiligte

• Bondonneau, Louis
• Grießmeier, Jean-Mathias
• Theureau, Gilles
• Serylak, Maciej

Titel

Low frequency pulsar observations with the international LOFAR station FR606

Ist Teil von

• Proceedings of the International Astronomical Union, 2017-09, Vol.13 (S337), p.313-314

Ort / Verlag

Cambridge, UK: Cambridge University Press

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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).