Volume 113, Number 2, January 2016
|Number of page(s)||6|
|Section||Geophysics, Astronomy and Astrophysics|
|Published online||10 February 2016|
Dwarf galaxy γ-excess and 3.55 keV X-ray line in a nonthermal Dark Matter model
1 Astroparticle Physics and Cosmology Division, Saha Institute of Nuclear Physics - Kolkata 700064, India
2 Centre for Astroparticle Physics and Space science, Bose Institute - Kolkata 700091, India
Received: 4 November 2015
Accepted: 22 January 2016
Recent data from Reticulum II (RetII) require the energy range of the FermiLAT γ-excess to be . We adjust our unified nonthermal Dark Matter (DM) model to accommodate this. We have two extra scalars beyond the Standard Model to also explain the 3.55 keV X-ray line. Now the mass of the heavier of them has to be increased to lie around 250 GeV, while that of the lighter one remains at 7.1 keV. This requires a new seed mechanism for the γ-excess and new Boltzmann equations for the generation of the DM relic density. All concerned data for RetII and the X-ray line can now be fitted well and consistency with other indirect limits attained.
PACS: 95.35.+d – Dark matter (stellar, interstellar, galactic, and cosmological) / 95.30.Cq – Elementary particle processes / 12.60.Fr – Extensions of electroweak Higgs sector
© EPLA, 2016
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