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Low frequency pulsar observations with the international LOFAR station FR606

Published online by Cambridge University Press:  04 June 2018

Louis Bondonneau ,
Jean-Mathias Grießmeier ,
Gilles Theureau  and
Maciej Serylak
Louis Bondonneau
Affiliation:
Laboratoire de Physique et Chimie de l’Environnement et de l’Espace LPC2E CNRS-Université d’Orléans, 45071 Orléans Cedex 02, France email: louis.bondonneau@cnrs-orleans.fr
Jean-Mathias Grießmeier
Affiliation:
Laboratoire de Physique et Chimie de l’Environnement et de l’Espace LPC2E CNRS-Université d’Orléans, 45071 Orléans Cedex 02, France email: louis.bondonneau@cnrs-orleans.fr Station de Radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU, 18330, France
Gilles Theureau
Affiliation:
Laboratoire de Physique et Chimie de l’Environnement et de l’Espace LPC2E CNRS-Université d’Orléans, 45071 Orléans Cedex 02, France email: louis.bondonneau@cnrs-orleans.fr Station de Radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU, 18330, France Laboratoire Univers et Théories LUTh, Observatoire de Paris, CNRS/INSU, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France
Maciej Serylak
Affiliation:
SKA SA, Cape Town, South Africa
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Abstract

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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).

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S337: Pulsar Astrophysics the Next Fifty Years , September 2017 , pp. 313 - 314
Copyright
Copyright © International Astronomical Union 2018 

References

Bilous, et al. 2016, A&A, 591, A134Google Scholar
Griessmeier, et al. 2017, Proccedings IAU Symposium, No. 337, submitted (this volume)Google Scholar
Kondratiev, et al. 2016, A&A, 585, A128Google Scholar