TY - JOUR

T1 - On the Possible Asymmetry in Gamma Rays from Andromeda Due to Inverse Compton Scattering of Star Light on Electrons from Dark Matter Annihilation

AU - Belotsky, Konstantin

AU - Solovyov, Maxim

N1 - This work was supported by the Ministry of Science and Higher Education of the Russian Federation by project No. FSWU-2023-0068 “Fundamental and applied research of cosmic rays”.

PY - 2023/12

Y1 - 2023/12

N2 - Dark matter is a popular candidate to a new source of primary-charged particles, especially positrons in cosmic rays, which are proposed to account for observable anomalies. While this hypothesis of decaying or annihilating DM is mostly applied for our Galaxy, it could possibly lead to some interesting phenomena when applied for the other ones. In this work, we look into the hypothetical asymmetry in gamma radiation from the upper and lower hemisphere of the dark matter halo of the Andromeda galaxy due to inverse Compton scattering of starlight on the DM-produced electrons and positrons. While our 2D toy model raises expectations for the possible effect, a more complex approach gives negligible effect for the dark halo case, but shows some prospects for a dark disk model.

AB - Dark matter is a popular candidate to a new source of primary-charged particles, especially positrons in cosmic rays, which are proposed to account for observable anomalies. While this hypothesis of decaying or annihilating DM is mostly applied for our Galaxy, it could possibly lead to some interesting phenomena when applied for the other ones. In this work, we look into the hypothetical asymmetry in gamma radiation from the upper and lower hemisphere of the dark matter halo of the Andromeda galaxy due to inverse Compton scattering of starlight on the DM-produced electrons and positrons. While our 2D toy model raises expectations for the possible effect, a more complex approach gives negligible effect for the dark halo case, but shows some prospects for a dark disk model.

KW - Andromeda galaxy

KW - cosmic gamma-radiation

KW - dark matter

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85180475388&origin=inward&txGid=16c4442508e92851cb4d914e13c249ab

UR - https://www.mendeley.com/catalogue/fa78b878-34e5-3c03-b2cc-c4d20068329a/

U2 - 10.3390/galaxies11060109

DO - 10.3390/galaxies11060109

M3 - Article

VL - 11

JO - Galaxies

JF - Galaxies

SN - 2075-4434

IS - 6

M1 - 109

ER -