Constraining gamma-ray lines from dark matter annihilation using Fermi-LAT and HESS data

Author(s)

Angel, Lucia ; Gambini, Guillermo ; Guedes, Leticia ; Queiroz, Farinaldo S. ; de Souza, Vitor

• Document type: Journal article
• Source: Journal of Cosmology and Astroparticle Physics; v. N/A, n. 4, p. 14-pg., 2024-04-01.

Abstract

Using 14 years of Fermi-LAT data and 10 years of H.E.S.S. observations in thedirection of the galactic center, we derive limits on gamma-ray lines originated from darkmatter annihilations for fermionic and scalar fields. We describe the dark matter annihilationinto gamma gamma or gamma Zfinal states in terms of effective operators and place limits on the energyscale as a function of the dark matter mass, taking into account the energy resolution ofthe instruments. For the Fermi-LAT data, we considered an NFW and a contracted NFWdark matter density profile, the latter being preferred by the Fermi GeV excess. For theH.E.S.S. observation, we used NFW and Einasto profiles. Fermi-LAT yields the most stringentconstraints for dark matter masses below 300 GeV, whereas H.E.S.S. has the strongest onesfor dark matter masses above 1 TeV. The telescopes share similar sensitivities for dark mattermasses between 300 GeV and 1 TeV. We conclude that Fermi-LAT (H.E.S.S.) can probe energyscales up to10(20)TeV for scalar and fermionic dark matter particles. (AU)

• FAPESP's process: 21/01089-1 - Cherenkov Telescope Array: construction and first discoveries
• Grantee: Luiz Vitor de Souza Filho
• Support Opportunities: Special Projects
• FAPESP's process: 21/14335-0 - ICTP South American Institute for Fundamental Research: a regional center for Theoretical Physics
• Grantee: Nathan Jacob Berkovits
• Support Opportunities: Special Projects
• FAPESP's process: 23/01197-4 - Closing in on Dark Matter at the LHC
• Grantee: Yoxara Sánchez Villamizar
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 22/16580-5 - Unveiling the Nature of Dark Matter with CTA
• Grantee: Guillermo Gerardo Rivera Gambini
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/25225-9 - São Paulo Research and Analysis Center
• Grantee: Sergio Ferraz Novaes
• Support Opportunities: Special Projects