scholarly journals Bounds on cross sections and lifetimes for dark matter annihilation and decay into charged leptons from gamma-ray observations of dwarf galaxies

2009 ◽  
Vol 80 (2) ◽  
Author(s):  
Rouven Essig ◽  
Neelima Sehgal ◽  
Louis E. Strigari
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Gamma Ray ◽  
Dwarf Galaxies ◽  
Dark Matter Annihilation ◽  
Charged Leptons

scholarly journals Search for gamma-ray spectral lines from dark matter annihilation in dwarf galaxies with the High-Altitude Water Cherenkov observatory

2020 ◽  
Vol 101 (10) ◽  
Author(s):  
A. Albert ◽  
R. Alfaro ◽  
C. Alvarez ◽  
J. C. Arteaga-Velázquez ◽  
K. P. Arunbabu ◽  
...  
Keyword(s):  
Dark Matter ◽  
High Altitude ◽  
Gamma Ray ◽  
Dwarf Galaxies ◽  
Spectral Lines ◽  
Dark Matter Annihilation

scholarly journals Gamma-Ray Effects of Dark Forces in Dark Matter Clumps

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
K. Belotsky ◽  
M. Khlopov ◽  
A. Kirillov
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Gamma Ray ◽  
Mass Density ◽  
Diffuse Radiation ◽  
Interaction Constant ◽  
Small Scale ◽  
Annihilation Rate ◽  
Dark Matter Annihilation ◽  
Ray Effects

Existence of new gauge U(1) symmetry possessed by dark matter (DM) particles implies the existence of a new Coulomb-like interaction, which leads to Sommerfeld-Gamow-Sakharov enhancement of dark matter annihilation at low relative velocities. We discuss a possibility to put constraints on such dark forces of dark matter from the observational data on the gamma radiation in our Galaxy. Gamma-rays are supposed to originate from annihilation of DM particles in the small scale clumps, in which annihilation rate is supposed to be enhanced, besides higher density, due to smaller relative velocitiesvof DM particles. For possible cross sections, mass of annihilating particles, masses of clumps, and the contribution of annihilating particles in the total DM density we constrain the strength of new dark long range forces from comparison of predicted gamma-ray signal with Fermi/LAT data on unidentified point-like gamma-ray sources (PGS) as well as on diffuseγ-radiation. Both data on diffuse radiation and data on PGS put lower constraints on annihilation cross section at any dark interaction constant, where diffuse radiation provides stronger constraint at smaller clump mass. Density of annihilating DM particles is conventionally supposed to be defined by the frozen annihilation processes in early Universe.

scholarly journals Prospect for dark matter annihilation signatures from gamma-ray observation of dwarf galaxies by LHAASO

2019 ◽  
Vol 100 (8) ◽  
Author(s):  
Dong-Ze He ◽  
Xiao-Jun Bi ◽  
Su-Jie Lin ◽  
Peng-Fei Yin ◽  
Xin Zhang
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Dwarf Galaxies ◽  
Dark Matter Annihilation

scholarly journals Limits on dark matter annihilation cross sections to gamma-ray lines with subhalo distributions in N -body simulations and Fermi LAT data

2017 ◽  
Vol 95 (6) ◽  
Author(s):  
Yun-Feng Liang ◽  
Zi-Qing Xia ◽  
Kai-Kai Duan ◽  
Zhao-Qiang Shen ◽  
Xiang Li ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Gamma Ray ◽  
Dark Matter Annihilation

scholarly journals Formation of massive globular clusters with dark matter and its implication on dark matter annihilation

2020 ◽  
Vol 496 (1) ◽  
pp. L70-L74
Author(s):  
Henriette Wirth ◽  
Kenji Bekki ◽  
Kohei Hayashi
Keyword(s):  
Dark Matter ◽  
Observational Studies ◽  
Globular Clusters ◽  
Galactic Halo ◽  
Dwarf Galaxies ◽  
Large Range ◽  
Dark Matter Annihilation ◽  
Central Regions ◽  
Γ Ray ◽  
The Masses

ABSTRACT Recent observational studies of γ-ray emission from massive globular clusters (GCs) have revealed possible evidence of dark matter (DM) annihilation within GCs. It is, however, still controversial whether the emission comes from DM or from millisecond pulsars. We here present the new results of numerical simulations, which demonstrate that GCs with DM can originate from nucleated dwarfs orbiting the ancient Milky Way. The simulated stripped nuclei (i.e. GCs) have the central DM densities ranging from 0.1 to several M⊙ pc−3, depending on the orbits and the masses of the host dwarf galaxies. However, GCs born outside the central regions of their hosts can have no/little DM after their hosts are destroyed and the GCs become the Galactic halo GCs. These results suggest that only GCs originating from stellar nuclei of dwarfs can possibly have DM. We further calculate the expected γ-ray emission from these simulated GCs and compare them to observations of ω Cen. Given the large range of DM densities in the simulated GCs, we suggest that the recent possible detection of DM annihilation from GCs should be more carefully interpreted.

Sign in / Sign up

Export Citation Format

Share Document