Limits to dark matter annihilation cross-section from a combined analysis of MAGIC and Fermi-LAT observations of dwarf satellite galaxies

Abstract

We present the first joint analysis of gamma-ray data from the MAGIC Cherenkov telescopes and the Fermi Large Area Telescope (LAT) to search for gamma-ray signals from dark matter annihilation in dwarf satellite galaxies. We combine 158 hours of Segue 1 observations with MAGIC with 6-year observations of 15 dwarf satellite galaxies by the Fermi-LAT. We obtain limits on the annihilation cross-section for dark matter particle masses between 10 GeV and 100 TeV -the widest mass range ever explored by a single gamma-ray analysis. These limits improve on previously published Fermi -LAT and MAGIC results by up to a factor of two at certain masses. Our new inclusive analysis approach is completely generic and can be used to perform a global, sensitivity-optimized dark matter search by combining data from present and future gamma-ray and neutrino detectors.

A Two-Component Dark Matter Model and its Associated Gravitational Waves

“…13, we present the indirect and direct detection bounds on the mass of the WIMP DM. In the left panel, the AMS 02 indirect detection bound coming from the WIMP DM annihilation to b b [17,106] is indicated with a red line. We see a sharp rise around M 1 62 GeV which corresponds to the SM Higgs resonance region.…”

“…The most promising and studied solution to this problem is the Weekly Interacting Massive Particle (WIMP) [11][12][13][14]. The WIMP DM is, however, strongly constrained by experimental data [15][16][17][18][19][20]. Thus, more attention has been drawn to alternative DM production mechanisms.…”

Distinctive signals of boosted dark matter from its semi-annihilation

“…induces further suppressed SD cross section (σ SD ∝ v 4 ). In this case, the standard annihilation cross section for χχ → qq induced from the above PP interaction by crossing symmetry corresponds to s-wave, and the model is strongly constrained by gamma ray observations of the MAGIC and Fermi-LAT Collaborations if the dark matter mass is below O(100) GeV [29].…”

Implications of mixed axion-neutralino dark matter

“…For each point shown in Fig. 1, the maximum allowed ξ ratio is computed without violating the LUX bound on the SI scattering cross section rate and the Fermi-LAT/MAGIC combined reach via on gamma rays from Z 1 Z 1 → W + W − channel [41]. Although indirect dark matter searches have not started probing the region expected from the NUHM2 model as seen in Fig.…”

“…Additional neutralinos are assumed to be produced from axino and saxion decays. For m Z 1 330 GeV, neutralino can make up to 100% of the DM without violating published limits on the dark matter annihilation cross section rate [41]. Thermally produced neutralino abundance can be as low as ∼0.005 with A/H resonance annihilations (pink shaded area).…”