Dark matter annihilation and non-thermal Sunyaev-Zel'dovich effect: II. Dwarf spheroidal galaxy
- National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
- Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
- Center of High Energy Physics, Peking University, Beijing, 100871 (China)
We calculate the CMB temperature distortion due to the energetic electrons and positrons produced by dark matter (DM) annihilation (Sunyaev-Zel'dovich effect, SZ{sub DM}) in dwarf spheroidal galaxies (dSphs). In the calculation we have included two important effects which were previously ignored. First we show that the e{sup ±} with energy less than ∼ GeV, which were neglected in previous calculation, could contribute a significant fraction of the total signal. Secondly we also consider the full effects of diffusion loss, which could significantly reduce the density of e{sup ±} at the center of cuspy halos. For neutralinos, we find that detecting such kind of SZ effect is beyond the capability of the current or even the next generation experiments, which is consistent with the quantitative description made by S. Colafrancesco in [1]. In the case of light dark matter (LDM) the signal is much larger, but even in this case it is only marginally detectable with the next generation of experiment such as ALMA. We conclude that similar to the case of galaxy clusters, in the dwarf galaxies the SZ{sub DM} effect is not a strong probe of DM annihilations.
- OSTI ID:
- 22275384
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
Similar Records
On the Sunyaev-Zel'dovich effect from dark matter annihilation or decay in galaxy clusters
Sunyaev-Zel'dovich effects from annihilating dark matter in the Milky Way: Smooth halo, subhalos, and intermediate-mass black holes