Searching for dark matter sub-structure with HAWC

Abeysekara, A. U.; Albert, A.; Alfaro, R.; Alvarez, C.; Arceo, R.; Arteaga-Velázquez, J. C.; Rojas, D. Avila; Solares, H. A.  Ayala; Belmont-Moreno, E.; BenZvi, S. Y.; Brisbois, C.; Caballero-Mora, K. S.; Carramiñana, A.; Casanova, S.; Cotzomi, J.; de León, S. Coutiño; León, C. De; Fuente, E. De la; Dichiara, S.; Dingus, B. L.; DuVernois, M. A.; Díaz-Vélez, J. C.; Engel, K.; Espinoza, C.; Fleischhack, H.; Fraija, N.; Galván-Gámez, A.; García-González, J. A.; González, M. M.; Goodman, J. A.; Harding, J. P.; Hona, B.; Hueyotl-Zahuantitla, F.; Hüntemeyer, P.; Iriarte, A.; Lara, A.; Lee, W. H.; Vargas, H. León; Linnemann, J. T.; Longinotti, A. L.; Luis-Raya, G.; Lundeen, J.; Malone, K.; Marinelli, S. S.; Martinez, O.; Martinez-Castellanos, I.; Martínez-Castro, J.; Matthews, J. A.; Miranda-Romagnoli, P.; Moreno, E.; Mostafá, M.; Nayerhoda, A.; Nellen, L.; Newbold, M.; Nisa, M. U.; Noriega-Papaqui, R.; Pérez-Pérez, E. G.; Ren, Z.; Rho, C. D.; Rivière, C.; Rosa-González, D.; Rosenberg, M.; Salazar, H.; Greus, F. Salesa; Sandoval, A.; Schneider, M.; Sinnis, G.; Smith, A. J.; Springer, R. W.; Tollefson, K.; Torres, I.; Vianello, G.; Weisgarber, T.; Wood, J.; Yapici, T.; Zepeda, A.; Zhou, H.; Álvarez, J. D.

doi:10.1088/1475-7516/2019/07/022

Title: Searching for dark matter sub-structure with HAWC

Journal Article · 01 July 2019 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2019/07/022 · OSTI ID:1566109

Abeysekara, A. U.; Albert, A.; Alfaro, R.; Alvarez, C.; Arceo, R.; Arteaga-Velázquez, J. C.; Rojas, D. Avila; Solares, H. A. Ayala; Belmont-Moreno, E.; BenZvi, S. Y.; Brisbois, C.; Caballero-Mora, K. S.; Carramiñana, A.; Casanova, S.; Cotzomi, J.; de León, S. Coutiño; León, C. De; Fuente, E. De la; Dichiara, S.; Dingus, B. L. more »

Numerical simulations show that the dark matter halos surrounding galaxies are expected to contain many over-densities or sub-halos. The most massive of these sub-halos can be optically observed in the form of dwarf galaxies. However, most lower mass sub-halos are predicted to exist as dark dwarf galaxies: sub-halos like dwarf galaxies with no luminous counterpart. It may be possible to detect these unseen sub-halos from gamma-ray signals originating from dark matter annihilation. The High Altitude Water Cherenkov Observatory (HAWC) is a very high energy (500 GeV to >100 TeV) gamma ray detector with a wide field-of-view and near continuous duty cycle, making HAWC ideal for unbiased sky surveys. We perform a search for gamma ray signals from dark dwarfs in the Milky Way halo with HAWC. We perform a targeted search of HAWC gamma-ray sources which have no known association with lower-energy counterparts, based on an unbiased survey of the entire sky. With no sources found to strongly prefer dark matter models, we calculate the ability of HAWC to observe dark dwarfs. We also compute the HAWC sensitivity to potential future detections for a given model of dark matter substructure. Assuming thermal dark matter, we find the corresponding J-factor of a dark dwarf required to reach the HAWC detection criterion is 5.79× 10²⁰ GeV² cm^-5 sr for one particular set of dark matter assumptions. HAWC is found to be able to competitively constrain dark matter annihilation from discovered halos with J-factors on the scale of 10¹⁹ GeV² cm^-5 sr or greater, with better constraints obtained on dark matter models with >10 TeV masses and sources that transit overhead.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: The HAWC collaboration

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1566109

Report Number(s):: LA-UR-18-31168; TRN: US2000968

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2019, Issue 07; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Constraints to Dark Matter Annihilation from High-Latitude HAWC Unidentified Sources Coronado-Blázquez, Javier; Sánchez-Conde, Miguel A. Galaxies, Vol. 8, Issue 1 https://doi.org/10.3390/galaxies8010005	journal	December 2019
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