PHECT: A lightweight computation tool for pulsar halo emission

Abstract

$\gamma$-ray pulsar halos, most likely formed by inverse Compton scattering of electrons and positrons propagating in the pulsar-surrounding interstellar medium with background photons, serve as an ideal probe for Galactic cosmic-ray propagation on small scales (typically tens of parsecs). While the associated electron and positron propagation is often modeled using homogeneous and isotropic diffusion, termed here as standard diffusion, the actual transport process is expected to be more complex. This work introduces the Pulsar Halo Emission Computation Tool (PHECT), a lightweight software designed for modeling pulsar halo emission. PHECT incorporates multiple transport models extending beyond standard diffusion, accounting for different possible origins of pulsar halos. Users can conduct necessary computations simply by configuring a YAML file without manual code edits. Furthermore, the tool adopts finite-volume discretizations that remain stable on non-uniform grids and in the presence of discontinuous diffusion coefficients. PHECT is ready for the increasingly precise observational data and the rapidly growing sample of pulsar halos.

47 pages, 10 figures. Submitted to PRD; revised in response to the first round of referee comments

References in corpus (70)

• The ATNF Pulsar Catalogue
• The Evolution and Structure of Pulsar Wind Nebulae
• Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
• TeV Gamma-Ray Sources from a Survey of the Galactic Plane with Milagro
• The Most Likely Sources of High Energy Cosmic-Ray Electrons in Supernova Remnants
• 3HWC: The Third HAWC Catalog of Very-High-Energy Gamma-ray Sources
• Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients
• Pulsars versus Dark Matter Interpretation of ATIC/PAMELA
• Galactic electrons and positrons at the Earth:new estimate of the primary and secondary fluxes
• HAWC Observations Strongly Favor Pulsar Interpretations of the Cosmic-Ray Positron Excess
• Extended Very-High-Energy Gamma-Ray Emission Surrounding PSR J0622 + 3749 Observed by LHAASO-KM2A
• PICARD: A novel code for the Galactic Cosmic Ray propagation problem
• Propagation of cosmic rays in the AMS-02 era
• Using HAWC to Discover Invisible Pulsars
• On the TeV Halo Fraction in gamma-ray bright Pulsar Wind Nebulae
• Self-Generated Cosmic-Ray Confinement in TeV Halos: Implications for TeV Gamma-Ray Emission and the Positron Excess
• Detection of a $\gamma$-ray halo around Geminga with the Fermi-LAT and implications for the positron flux
• Lessons from HAWC PWNe observations: the diffusion constant is not a constant; Pulsars remain the likeliest sources of the anomalous positron fraction; Cosmic rays are trapped for long periods of time in pockets of inefficient diffusion
• Pulsar wind nebulae with bow shocks: non-thermal radiation and cosmic ray leptons
• Two-zone diffusion of electrons and positrons from Geminga explains the positron anomaly
• Proper Motion Measurements of Pulsar B1951+32 in the Supernova Remnant CTB 80
• Initial spin periods of neutron stars in supernova remnants
• Pulsar-wind nebulae and magnetar outflows: observations at radio, X-ray, and gamma-ray wavelengths
• Understanding the multiwavelength observation of Geminga's TeV halo: the role of anisotropic diffusion of particles
• Positron flux and gamma-ray emission from Geminga pulsar and pulsar wind nebula
• Possible origin of the slow-diffusion region around Geminga
• Gamma-ray halos around pulsars as the key to understanding cosmic ray transport in the Galaxy
• Cosmic-Ray Propagation in Light of Recent Observation of Geminga
• Contribution of pulsars to cosmic-ray positrons in light of recent observation of inverse-Compton halos
• Evidences of low-diffusion bubbles around Galactic pulsars
• Pulsar TeV Halos Explain the TeV Excess Observed by Milagro
• Self-Generated Cosmic-Ray Turbulence Can Explain the Morphology of TeV Halos
• Does the Geminga, Monogem and PSR J0622+3749 $\gamma$-ray halos imply slow diffusion around pulsars?
• Superluminal problem in diffusion of relativistic particles and its phenomenological solution
• Measuring the Local Diffusion Coefficient with H.E.S.S. Observations of Very High-Energy Electrons
• GeV observations of the extended pulsar wind nebulae constrain the pulsar interpretations of the cosmic-ray positron excess
• Constraining the magnetic field in the TeV halo of Geminga with X-ray Observation
• On transition of propagation of relativistic particles from the ballistic to the diffusion regime
• Klein-Nishina effect and the cosmic ray electron spectrum
• The Physics of Pulsar Halos: Research Progress and Prospect
• Insights from LHAASO and IceCube into the origin of the Galactic diffuse TeV--PeV emission
• Reanalyze the pulsar scenario to explain the cosmic positron excess considering the recent developments
• Anisotropic diffusion cannot explain TeV halo observations
• Slow diffusion is necessary to explain the gamma-ray pulsar halos
• Quantitative Age Estimation of Supernova Remnants and Associated Pulsars
• TeV halos and the role of pulsar wind nebulae as sources of cosmic ray positrons
• HAWC Detection of a TeV Halo Candidate Surrounding a Radio-quiet pulsar
• Diffuse Ultra-High-Energy Gamma-Ray Emission From TeV Halos
• Radiative losses and cut-offs of energetic particles at relativistic shocks
• Pulsars Do Not Produce Sharp Features in the Cosmic-Ray Electron and Positron Spectra
• Morphology of Gamma-Ray Halos around Middle-Aged Pulsars: Influence of the Pulsar Proper Motion
• Geminga's pulsar halo: an X-ray view
• Self-consistent interpretations of the multi-wavelength gamma-ray spectrum of LHAASO J0621$+$3755
• Interstellar scintillation and polarization of PSR B0656+14 in the Monogem Ring
• Gamma-ray halos around pulsars: impact on pulsar wind physics and galactic cosmic ray transport
• Test of the superdiffusion model in the interstellar medium around the Geminga pulsar
• On the surface brightness radial profile of the extended $\gamma$-ray sources
• Interpretation of the puzzling gamma-ray spectrum of the Geminga halo
• Features of the gamma-ray pulsar halo HESS J1831$-$098
• Effect of magnetic field correlation length on the gamma-ray pulsar halo morphology under anisotropic diffusion
• Constraining the slow-diffusion zone size and electron injection spectral index for the Geminga pulsar halo
• Mirages and Large TeV Halo-Pulsar Offsets from Cosmic Ray Propagation
• Anisotropic Diffusion of $e^{\pm }$ in Pulsar Halos over Multiple Coherence of Magnetic Fields
• Cosmic Ray Diffusion in the Turbulent Interstellar Medium: Effects of Mirror Diffusion and Pitch Angle Scattering
• Extended TeV Halos May Commonly Exist around Middle-Aged Pulsars
• A rigorous solution to the superluminal issue in the diffusion equation
• On the origin of the X-ray emission surrounding PSR B0656+14 in the eROSITA Cal-PV data
• The environment of TeV halo progenitors
• Discrete treatment of inverse Compton scattering: implications on parameter estimation in gamma-ray astronomy
• Possible evidence for extended X-ray emission surrounding PSR B0656+14 with eROSITA

Cited by in corpus (1)

• Anisotropic Diffusion in Pulsar Halos: Interpreting the asymmetric morphology of Geminga and Monogem halos measured by HAWC