Wide-band simultaneous observations of pulsars: Disentangling dispersion measure and profile variations
Hassall, T. E; Stappers, B. W.; Hessels, J. W. T.; Kramer, M; Alexov, A; Anderson, K.; Coenen, T; Karastergiou, A; Keane, E. F.; Kondratiev, V. I.; Butcher, Harvey; Noutsos, A; Sobey, C; Falcke, H; Bell, Michael R; Bernardi, G; Bonafede, A; Brentjens, Michiel A; Brouw, W. N.; Ciardi, Benedetta; Hoeft, M; Koopmans, L. V. E.; Kuniyoshi, M; Pandey, V N; Reich, W; van Weeren, R J
Dispersion in the interstellar medium is a well known phenomenon that follows a simple relationship, which has been used to predict the time delay of dispersed radio pulses since the late 1960s. We performed wide-band simultaneous observations of four pulsars with LOFAR (at 40-190 MHz), the 76-m Lovell Telescope (at 1400 MHz) and the Effelsberg 100-m Telescope (at 8000 MHz) to test the accuracy of the dispersion law over a broad frequency range. In this paper we present the results of these...[Show more]
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|Source:||Astronomy and Astrophysics|
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