LHAASO sensitivity for diffuse gamma-ray signals from the Galaxy

Abstract

We estimate the sensitivity of LHAASO telescope for the large angular scale diffuse gamma-ray flux in multi-TeV - multi-PeV energy range. We discuss possible sources of the signal in this energy range including the guaranteed flux from cosmic ray interactions in the interstellar medium and possible flux from decaying dark matter. We show that LHAASO will be able to detect the diffuse cosmic ray induced gamma-ray flux up to high Galactic latitude regions thus providing firm identification of the Galactic cosmic ray component of the astrophysical neutrino signal detected by IceCube and clarification of the nature of the knee feature of the cosmic ray spectrum. Comparing the diffuse flux sensitivity with the diffuse gamma-ray flux expected from the dark matter decays, we show LHAASO will be able to detect the gamma-ray signal from dark matter particles of PeV-EeV mass decaying on the time scale up to 3e29 s.

7 pages 5 figures

References in corpus (10)

• Where to find a dark matter sterile neutrino?
• Constraining DM properties with SPI
• A Galactic Halo Origin of the Neutrinos Detected by IceCube
• Search for the light dark matter with an X-ray spectrometer
• Escape model for Galactic cosmic rays and an early extragalactic transition
• All-Sky Measurement of the Anisotropy of Cosmic Rays at 10 TeV and Mapping of the Local Interstellar Magnetic Field
• Escape of cosmic rays from the Galaxy and effects on the circumgalactic medium
• High-energy neutrinos from cosmic ray interactions in the Local Bubble
• Fluxes of diffuse gamma rays and neutrinos from cosmic-ray interactions with circumgalactic gas
• Mapping large-scale diffuse gamma-ray emission in 10-100 TeV band with Cherenkov telescopes

Cited by in corpus (13)

• HAWC observations of the acceleration of very-high-energy cosmic rays in the Cygnus Cocoon
• Gamma rays as probes of cosmic-ray propagation and interactions in galaxies
• Probing the Particle Spectrum of Nature with Evaporating Black Holes
• Constraints on heavy decaying dark matter from 570 days of LHAASO observations
• The Physics of Pulsar Halos: Research Progress and Prospect
• First implications of Tibet AS${}_{\gamma }$ data for heavy dark matter
• Pion decay model of TIBET-AS$\gamma$ PeV gamma-ray signal
• Probing photon-ALP oscillations from the MAGIC observations of FSRQ QSO B1420+326
• Signatures of anisotropic diffusion around PeVatrons in 100 TeV gamma-ray data
• Hot spots in the neutrino flux created by cosmic rays from Cygnus and Vela?
• Prospects for annihilating dark matter from M31 and M33 observations with the Cherenkov Telescope Array
• The traveling-PWN modeling attempt on the enigmatic LHAASO dumbbell-like structure
• Particle Acceleration in the Cygnus Superbubble