Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS

Gammaldi, V.; Fusco, P.; Fiori, A.; Fegan, S. J.; di Venere, L.; Domínguez, A.; di Lalla, N.; di Mauro, M.; de Angelis, A.; D'Ammando, F.; Cuoco, A.; Crnogorcevic, M.; Ciprini, S.; Chen, A. W.; Charles, E.; Buson, S.; Bruel, P.; Bonino, R.; Bissaldi, E.; Berenji, B.; Bellazzini, R.; Baldini, L.; Abdollahi, S.; Gargano, F.; Gasparrini, D.; Giacchino, F.; Giglietto, N.; Giliberti, M.; Giordano, F.; Giroletti, M.; Grenier, I. A.; Guiriec, S.; Gustafsson, M.; Hays, E.; Hewitt, J. W.; Horan, D.; Katagiri, H.; Kuss, M.; Li, J.; Longo, F.; Loparco, F.; Lorusso, L.; Martí-Devesa, G.; Mazziotta, M. N.; McEnery, J. E.; Mereu, I.; Meyer, M.; Michelson, P. F.; Mirabal, N.; Mitthumsiri, W.; Mizuno, T.; Morselli, A.; Moskalenko, I. V.; Negro, M.; Omodei, N.; Orienti, M.; Orlando, E.; Panzarini, G.; Persic, M.; Pesce-Rollins, M.; Pillera, R.; Porter, T. A.; Principe, G.; Rainò, S.; Rando, R.; Razzano, M.; Reimer, O.; Sánchez-Conde, M.; Saz Parkinson, P. M.; Serini, D.; Suson, D. J.; Torres, D. F.; Zaharijas, G.; Albert, A.; Alfaro, R.; Alvarez, C.; Arteaga-Velázquez, J. C.; Avila Rojas, D.; Ayala Solares, H. A.; Babu, R.; Belmont-Moreno, E.; Caballero-Mora, K. S.; Capistrán, T.; Carramiñana, A.; Casanova, S.; Chaparro-Amaro, O.; Cotti, U.; Cotzomi, J.; Coutiño de León, S.; de La Fuente, E.; Diaz Hernandez, R.; Dingus, B. L.; Duvernois, M. A.; Durocher, M.; Díaz-Vélez, J. C.; Engel, K.; Espinoza, C.; Fan, K. L.; Fraija, N.; García-González, J. A. et al.
Referencia bibliográfica

Journal of Cosmology and Astroparticle Physics

Fecha de publicación:
3
2026
Número de autores
587
Número de autores del IAC
12
Número de citas
5
Número de citas referidas
0
Descripción
Dwarf spheroidal galaxies (dSphs) are excellent targets for indirect dark matter (DM) searches using gamma-ray telescopes because they are thought to have high DM content and a low astrophysical background. The sensitivity of these searches is improved by combining the observations of dSphs made by different gamma-ray telescopes. We present the results of a combined search by the most sensitive currently operating gamma-ray telescopes, namely: the satellite-borne Fermi-LAT telescope; the ground-based imaging atmospheric Cherenkov telescope arrays H.E.S.S., MAGIC, and VERITAS; and the HAWC water Cherenkov detector. Individual datasets were analyzed using a common statistical approach. Results were subsequently combined via a global joint likelihood analysis. We obtain constraints on the velocity-weighted cross section <σv> for DM self-annihilation as a function of the DM particle mass. This five-instrument combination allows the derivation of up to 2-3 times more constraining upper limits on <σv> than the individual results over a wide mass range spanning from 5 GeV to 100 TeV. Depending on the DM content modeling, the 95% confidence level observed limits reach 1.5×10-24 cm3s-1 and 3.2×10-25 cm3s-1, respectively, in the τ + τ - annihilation channel for a DM mass of 2 TeV.