Simulation study of performance of the Very Large Area gamma-ray Space Telescope

Abstract

The Very Large Area gamma-ray Space Telescope (VLAST) is a mission concept proposed to detect gamma-ray photons through both the Compton scattering and electron-positron pair production mechanisms, enabling the detection of photons with energies ranging from MeV to TeV. This project aims to conduct a comprehensive survey of the gamma-ray sky from a low Earth orbit using an anti-coincidence detector, a tracker detector that also serves as a low energy calorimeter, and a high energy imaging calorimeter. We developed a Monte Carlo simulation application of the detector with the GEANT4 toolkit to evaluate the instrument performance including the effective area, angular resolution and energy resolution, as well as explored specific optimizations of the detector configuration. Our simulation-based analysis indicates that the VLAST's current design is physically feasible, with an acceptance larger than 10~${\mathrm{m}}^2\mathrm{sr}$ which is four times larger than Fermi-LAT, an energy resolution better than 2\% at 10~GeV, and an angular resolution better than 0.2 degrees at 10~GeV. The VLAST project is expected to make significant contribution to the field of gamma-ray astronomy and to enhance our understanding of the cosmos.

15 pages, 16 figures; Nuclear Science and Techniques in press

References in corpus (20)

• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• Incremental Fermi Large Area Telescope Fourth Source Catalog
• Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons
• The DArk Matter Particle Explorer mission
• A decade of Gamma-Ray Bursts observed by $Fermi$-LAT: The 2${}^{nd}$ GRB catalog
• GeV excess in the Milky Way: The Role of Diffuse Galactic gamma ray Emission template
• Millisecond pulsar interpretation of the Galactic center gamma-ray excess
• The diffuse $\gamma$-ray background is dominated by star-forming galaxies
• Lorentz invariance violation induced threshold anomaly versus very-high energy cosmic photon emission from GRB 221009A
• PANGU: A High Resolution Gamma-ray Space Telescope
• Search for gamma-ray spectral lines with the DArk Matter Particle Explorer
• Massive Argon Space Telescope (MAST): a concept of heavy time projection chamber for gamma-ray astronomy in the 100 MeV --- 1 TeV energy range
• Astrophysics: Extreme emission seen from $\gamma$-ray bursts
• Revisiting the constraints on primordial black hole abundance with the isotropic gamma ray background
• Prospects for the detection of the prompt very-high-energy emission from $\gamma$-ray bursts with the High Altitude Detection of Astronomical Radiation experiment
• Gamma- and Cosmic-Ray Observations with the GAMMA-400 Gamma-Ray Telescope
• COSI: From Calibrations and Observations to All-sky Images
• An Unsupervised Machine Learning Method for Electron--Proton Discrimination of the DAMPE Experiment
• MeV Astrophysical Spectroscopic Surveyor (MASS): A Compton Telescope Mission Concept

Cited by in corpus (2)

• Observations of the Fermi bubbles and the Galactic center excess with the DArk Matter Particle Explorer
• Deciphering the spectral bumps of Galactic cosmic rays through gamma-ray observations of nearby molecular clouds