Detection of strong scattering close to the eclipse region of PSR B1957+20
J. T. Bai, S. Dai, Q. J. Zhi, W. A. Coles, D. Li, W. W. Zhu, G. Hobbs,, G. J. Qiao, N. Wang, J. P. Yuan, M. D. Filipovic, J. B. Wang, Z. C. Pan, L., H. Shang, S. J. Dang, S. Q. Wang, C. C. Miao
TL;DR
This study measures pulse scattering near the eclipse of PSR B1957+20, revealing strong turbulence-induced scattering effects that suggest scattering as a key eclipsing mechanism at 1.4 GHz.
Contribution
First measurement of pulse scattering close to the eclipse of PSR B1957+20, demonstrating turbulence effects in the eclipsing material.
Findings
Pulse scattering time-scales up to 0.2 ms near eclipse
Scattering scales with DM excess as τ ∝ ΔDM²
Evidence of Kolmogorov turbulence in eclipsing material
Abstract
We present the first measurement of pulse scattering close to the eclipse region of PSR B1957+20, which is in a compact binary system with a low-mass star. We measured pulse scattering time-scales up to 0.2 ms close to the eclipse and showed that it scales with the dispersion measure (DM) excess roughly as . Our observations provide the first evidence of strong scattering due to multi-path propagation effects in the eclipsing material. We show that Kolmogorov turbulence in the eclipsing material with an inner scale of m and an outer scale of the size of the eclipse region can naturally explain the observation. Our results show that the eclipsing material in such systems can be highly turbulent and suggest that scattering is one of the main eclipsing mechanisms at around 1.4 GHz.
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