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Scintillation of PSR B1508+55 -- the view from a 10,000-km baseline by Marthi, V. R.; Simard, D.; Main, R. A.; Pen, U. -L.; van Kerkwijk, M. H.; Vanderlinde, K.; Gupta, Y.; Roberts, C.; Quine, B. M. is a scholarly article available to read on EtoBox.

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We report on the simultaneous Giant Metrewave Radio Telescope (GMRT) and Algonquin Radio Observatory (ARO) observations at 550-750 MHz of the scintillation of PSR B1508+55, resulting in a $\sim$10,000-km baseline. This regime of measurement lies between the shorter few 100-1000~km baselines of earlier multi-station observations and the much longer earth-space baselines. We measure a scintillation cross-correlation coefficient of $0.22$, offset from zero time lag due to a $\sim 45$~s traversal time of the scintillation pattern. The scintillation time of 135~s is $3\times$ longer, ruling out isotropic as well as strictly 1D scattering. Hence, the low cross-correlation coefficient is indicative of highly anisotropic but 2D scattering. The common scintillation detected on the baseline is confined to low delays of $\lesssim 1 \mu$s, suggesting that this correlation may not be associated with the parabolic scintillation arc detected at the GMRT. Detection of pulsed echoes and their direct imaging with the Low Frequency Array (LOFAR) by a different group enable them to measure a distance of 125~pc to the screen causing these echoes. These previous measurements, alongside our observations,

Author

Marthi, V. R.; Simard, D.; Main, R. A.; Pen, U. -L.; van Kerkwijk, M. H.; Vanderlinde, K.; Gupta, Y.; Roberts, C.; Quine, B. M.

Published

2020

Language

EN