Scattering model of scintillation arcs in pulsar secondary spectra
arXiv:2402.19370 · doi:10.1093/mnras/stae1342
Abstract
The dynamic spectra of pulsars frequently exhibit diverse interference patterns, often associated with parabolic arcs in the Fourier-transformed (secondary) spectra. Our approach differs from previous ones in two ways: first, we extend beyond the traditional Fresnel-Kirchhoff method by using the Green's function of the Helmholtz equation, i.e.\ we consider spherical waves originating from three dimensional space, not from a two dimensional screen. Secondly, the discrete structures observed in the secondary spectrum result from discrete scatterer configurations, namely plasma concentrations in the interstellar medium, and not from the selection of points by the stationary phase approximation. Through advanced numerical techniques, we model both the dynamic and secondary spectra, providing a comprehensive framework that describes all components of the latter spectra in terms of physical quantities. Additionally, we provide a thorough analytical explanation of the secondary spectrum.
arXiv comment13 pages, 6 figures
References in corpus (26)
- Faint Scattering Around Pulsars: Probing the Interstellar Medium on Solar System Size Scales
- Imaging Magnetic Focusing of Coherent Electron Waves
- 100 Microarcsecond Resolution VLBI Imaging of Anisotropic Interstellar Scattering towards Pulsar B0834+06
- Interpretation of parabolic arcs in pulsar secondary spectra
- Theory of Parabolic Arcs in Interstellar Scintillation Spectra
- The Gaussian Plasma Lens in Astrophysics. Refraction
- Deflection of Pulsar Signal Reveals Compact Structures in the Galaxy
- Precision orbital dynamics from interstellar scintillation arcs for PSR J0437-4715
- Electron Density Structure of the Local Galactic Disk
- Scattering of pulsar radio emission by the interstellar plasma
- Long-term Scintillation Observations of Five Pulsars at 1540 MHz
- Scintillation arcs in low-frequency observations of the timing-array millisecond pulsar J0437-4715
- Predicting Pulsar Scintillation from Refractive Plasma Sheets
- A Scintillation Arc Survey of 22 Pulsars with Low to Moderate Dispersion Measures
- Double-lens Scintillometry: The variable scintillation of pulsar B1508+55
- Probing the local interstellar medium with scintillometry of the bright pulsar B1133+16
- Regimes in astrophysical lensing: refractive optics, diffractive optics, and the Fresnel scale
- Noodle Model for Scintillation Arcs
- The - Diagram: Transforming pulsar scintillation spectra to coordinates on highly anisotropic interstellar scattering screens
- Broadband Meter-Wavelength Observations of Ionospheric Scintillation
- Quantum theory of an atom laser originating from a Bose-Einstein condensate or a Fermi gas in the presence of gravity
- Interstellar Scintillation observations for PSR B0355+54
- The Frequency Dependence of Scintillation Arc Thickness in Pulsar B1133+16
- Disentangling interstellar plasma screens with pulsar VLBI: Combining auto- and cross-correlations
- Jiamusi Pulsar Observations: II. Scintillations of 10 Pulsars
- Pulsar Double-lensing Sheds Light on the Origin of Extreme Scattering Events