Title:	Measuring the intensity of the interstellar radiation field with ultra-high energy γ ray spectra
Authors:	Gupta, Nayantara
Keywords:	high energy astrophysics gamma rays gamma ray sources
Issue Date:	1-Jul-2025
Publisher:	Elsevier
Citation:	Journal of High Energy Astrophysics, 2025, Vol. 47, p100364
Abstract:	Our understanding of the intensity distribution of the interstellar radiation background is based on the observational data from IRAS, COBE-FIRAS and Planck. The intensity of this radiation field increases rapidly towards the Galactic plane and is the highest near the Galactic centre due to the high density of stars and dust. However, a precise determination of the variations of this radiation field with spatial and angular coordinates is not feasible observationally. We explore how future studies of gamma-ray spectra from numerous ultra-high-energy gamma-ray sources can indirectly probe variations in the interstellar radiation field’s intensity across different distances from the Galactic centre and across Galactic latitudes and longitudes. This study is crucial for making self-consistent predictions of high energy gamma-ray fluxes from Galactic sources detected by observatories like LHAASO, Tibet AS𝛾 and the next-generation gamma-ray telescopes.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/8413
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2025JHEAp..4700364G/abstract https://arxiv.org/abs/2411.19024 https://inspirehep.net/literature/2854222 https://doi.org/10.1016/j.jheap.2025.100364
Copyright:	2025 Elsevier B.V.
Appears in Collections:	Research Papers (A&A)

Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.