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Title: Searching for dark matter sub-structure with HAWC

Abstract

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 ofmore » a dark dwarf required to reach the HAWC detection criterion is 5.79× 10 20 GeV 2 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 10 19 GeV 2 cm -5 sr or greater, with better constraints obtained on dark matter models with >10 TeV masses and sources that transit overhead.« less

Authors:
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Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
The HAWC collaboration
OSTI Identifier:
1566109
Report Number(s):
LA-UR-18-31168
Journal ID: ISSN 1475-7516
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2019; Journal Issue: 07; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy and Astrophysics

Citation Formats

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., and Álvarez, J. D. Searching for dark matter sub-structure with HAWC. United States: N. p., 2019. Web. doi:10.1088/1475-7516/2019/07/022.
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. Searching for dark matter sub-structure with HAWC. United States. doi:10.1088/1475-7516/2019/07/022.
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., and Álvarez, J. D. Mon . "Searching for dark matter sub-structure with HAWC". United States. doi:10.1088/1475-7516/2019/07/022. https://www.osti.gov/servlets/purl/1566109.
@article{osti_1566109,
title = {Searching for dark matter sub-structure with HAWC},
author = {Abeysekara, A. U. and Albert, A. and Alfaro, R. and Alvarez, C. and Arceo, R. and Arteaga-Velázquez, J. C. and Rojas, D. Avila and Solares, H. A. Ayala and Belmont-Moreno, E. and BenZvi, S. Y. and Brisbois, C. and Caballero-Mora, K. S. and Carramiñana, A. and Casanova, S. and Cotzomi, J. and de León, S. Coutiño and León, C. De and Fuente, E. De la and Dichiara, S. and Dingus, B. L. and DuVernois, M. A. and Díaz-Vélez, J. C. and Engel, K. and Espinoza, C. and Fleischhack, H. and Fraija, N. and Galván-Gámez, A. and García-González, J. A. and González, M. M. and Goodman, J. A. and Harding, J. P. and Hona, B. and Hueyotl-Zahuantitla, F. and Hüntemeyer, P. and Iriarte, A. and Lara, A. and Lee, W. H. and Vargas, H. León and Linnemann, J. T. and Longinotti, A. L. and Luis-Raya, G. and Lundeen, J. and Malone, K. and Marinelli, S. S. and Martinez, O. and Martinez-Castellanos, I. and Martínez-Castro, J. and Matthews, J. A. and Miranda-Romagnoli, P. and Moreno, E. and Mostafá, M. and Nayerhoda, A. and Nellen, L. and Newbold, M. and Nisa, M. U. and Noriega-Papaqui, R. and Pérez-Pérez, E. G. and Ren, Z. and Rho, C. D. and Rivière, C. and Rosa-González, D. and Rosenberg, M. and Salazar, H. and Greus, F. Salesa and Sandoval, A. and Schneider, M. and Sinnis, G. and Smith, A. J. and Springer, R. W. and Tollefson, K. and Torres, I. and Vianello, G. and Weisgarber, T. and Wood, J. and Yapici, T. and Zepeda, A. and Zhou, H. and Álvarez, J. D.},
abstractNote = {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.},
doi = {10.1088/1475-7516/2019/07/022},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 07,
volume = 2019,
place = {United States},
year = {2019},
month = {7}
}

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