Low-frequency pulse profile variation in PSR B2217+47: evidence for echoes from the interstellar medium

@article{Michilli2018LowfrequencyPP,
  title={Low-frequency pulse profile variation in PSR B2217+47: evidence for echoes from the interstellar medium},
  author={Daniele Michilli and Jason W. T. Hessels and J. Y. Donner and Jean-Mathias Grie{\ss}meier and Maciej Serylak and B Shaw and Ben W. Stappers and Joris P W Verbiest and Adam T. Deller and Laura N. Driessen and Daniel R. Stinebring and L. Bondonneau and Marisa Geyer and M. Hoeft and Aris Karastergiou and Michael Kramer and Stefan Osłowski and Maura Pilia and Sotiris Sanidas and Patrick Weltevrede},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2018},
  volume={476},
  pages={2704-2716}
}
We have observed a complex and continuous change in the integrated pulse profile of PSR B2217+47, manifested as additional components trailing the main peak. These transient components are detected over 6 yr at 150 MHz using the LOw Frequency ARray (LOFAR), but they are not seen in contemporaneous Lovell observations at 1.5 GHz. We argue that propagation effects in the ionized interstellar medium (IISM) are the most likely cause. The putative structures in the IISM causing the profile variation… 

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