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51. First HAWC Observations of the Sun Constrain Steady TeV Gamma-Ray Emission

Author: 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., Capistràn, T., Carramiñana, A., Casanova, S., Castillo, M., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Enríquez-Rivera, O., Espinoza, C., Fleischhack, H., Fraija, N., García-González, J. A., Garfias, F., González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hona, B., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Vargas, H. León, Luis-Raya, G., Lundeen, J., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Zepeda, A., Zhou, H., Álvarez, J. D., Beacom, J. F., Leane, R. K., Linden, T., Ng, K. C. Y., Peter, A. H. G., and Zhou, B.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics, High Energy Physics - Phenomenology
Abstract: Steady gamma-ray emission up to at least 200 GeV has been detected from the solar disk in the Fermi-LAT data, with the brightest, hardest emission occurring during solar minimum. The likely cause is hadronic cosmic rays undergoing collisions in the Sun's atmosphere after being redirected from ingoing to outgoing in magnetic fields, though the exact mechanism is not understood. An important new test of the gamma-ray production mechanism will follow from observations at higher energies. Only the High Altitude Water Cherenkov (HAWC) Observatory has the required sensitivity to effectively probe the Sun in the TeV range. Using three years of HAWC data from November 2014 to December 2017, just prior to the solar minimum, we search for 1--100 TeV gamma rays from the solar disk. No evidence of a signal is observed, and we set strong upper limits on the flux at a few $10^{-12}$ TeV$^{-1}$ cm$^{-2}$ s$^{-1}$ at 1 TeV. Our limit, which is the most constraining result on TeV gamma rays from the Sun, is $\sim10\%$ of the theoretical maximum flux (based on a model where all incoming cosmic rays produce outgoing photons), which in turn is comparable to the Fermi-LAT data near 100 GeV. The prospects for a first TeV detection of the Sun by HAWC are especially high during solar minimum, which began in early 2018., Comment: 14 pages, 6 figures. See also companion paper 1808.05624. Accepted for publication in Physical Review D
Published: 2018
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52. Constraints on Spin-Dependent Dark Matter Scattering with Long-Lived Mediators from TeV Observations of the Sun with HAWC

Author: 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., Capistràn, T., Carramiñana, A., Casanova, S., Castillo, M., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Enríquez-Rivera, O., Espinoza, C., Fleischhack, H., Fraija, N., García-González, J. A., Garfias, F., González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hona, B., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Vargas, H. León, Luis-Raya, G., Lundeen, J., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Zepeda, A., Zhou, H., Álvarez, J. D., Beacom, J. F., Leane, R. K., Linden, T., Ng, K. C. Y., Peter, A. H. G., and Zhou, B.
Subjects: High Energy Physics - Phenomenology, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Abstract: We analyze the Sun as a source for the indirect detection of dark matter through a search for gamma rays from the solar disk. Capture of dark matter by elastic interactions with the solar nuclei followed by annihilation to long-lived mediators can produce a detectable gamma-ray flux. We search three years of data from the High Altitude Water Cherenkov Observatory and find no statistically significant detection of TeV gamma-ray emission from the Sun. Using this, we constrain the spin-dependent elastic scattering cross section of dark matter with protons for dark matter masses above 1 TeV, assuming an unstable mediator with a favorable lifetime. The results complement constraints obtained from Fermi-LAT observations of the Sun and together cover WIMP masses between 4 GeV and $10^6$ GeV. The cross section constraints for mediator decays to gamma rays can be as strong as $\sim10^{-45}$ cm$^{-2}$, which is more than four orders of magnitude stronger than current direct-detection experiments for 1 TeV dark matter mass. The cross-section constraints at higher masses are even better, nearly 7 orders of magnitude better than the current direct-detection constraints for 100 TeV dark matter mass. This demonstration of sensitivity encourages detailed development of theoretical models in light of these powerful new constraints., Comment: 11 pages, 4 figures. See also companion paper 1808.05620. Accepted for publication in Physical Review D
Published: 2018
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53. Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC

Author: Abeysekara, A. U., Alfaro, R., Alvarez, C., Alvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., De León, C., De la Fuente, E., Hernandez, R. Diaz, Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hona, B., Hueyotl-Zahuantitla, F., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lauer, R. J., Lee, W. H., Vargas, H. León, Longinotti, A. L., Luis-Raya, G., Luna-García, R., López-Cámara, D., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Vianello, G., Villaseñor, L., Weisgarber, T., Werner, F., Westerhoff, S., Wood, J., Yapici, T., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: After two years of operation, the High-Altitude Water Cherenkov (HAWC) Observatory has analyzed the TeV cosmic-ray sky over an energy range between $2.0$ and $72.8$ TeV. The HAWC detector is a ground-based air-shower array located at high altitude in the state of Puebla, Mexico. Using 300 light-tight water tanks, it collects the Cherenkov light from the particles of extensive air showers from primary gamma rays and cosmic rays. This detection method allows for uninterrupted observation of the entire overhead sky (2~sr instantaneous, 8.5~sr integrated) in the energy range from a few TeV to hundreds of TeV. Like other detectors in the northern and southern hemisphere, HAWC observes an energy-dependent anisotropy in the arrival direction distribution of cosmic rays. The observed cosmic-ray anisotropy is dominated by a dipole moment with phase $\alpha\approx40^{\circ}$ and amplitude that slowly rises in relative intensity from $8\times10^{-4}$ at 2 TeV to $14\times10^{-4}$ around 30.3 TeV, above which the dipole decreases in strength. A significant large-scale ($>60^{\circ}$ in angular extent) signal is also observed in the quadrupole and octupole moments, and significant small-scale features are also present, with locations and shapes consistent with previous observations. Compared to previous measurements in this energy range, the HAWC cosmic-ray sky maps improve on the energy resolution and fit precision of the anisotropy. These data can be used in an effort to better constrain local cosmic-ray accelerators and the intervening magnetic fields., Comment: 22 pages, 14 figures, 2 tables, submission to ApJ
Published: 2018
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54. Search for Dark Matter Gamma-ray Emission from the Andromeda Galaxy with the High-Altitude Water Cherenkov Observatory

Author: Albert, A., Alfaro, R., Alvarez, C., Alvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Eckner, C., Engel, K., Enríquez-Rivera, O., Espinoza, C., Fiorino, D. W., Fraija, N., Galván-Gámez, A., García-González, J. A., Garfias, F., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hona, B., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kunde, G. J., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., Malone, K., Marinelli, S. S., Martinez, O., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Riviére, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Zaharijas, G., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The Andromeda Galaxy (M31) is a nearby ($\sim$780 kpc) galaxy similar to our own Milky Way. Observational evidence suggests that it resides in a large halo of dark matter (DM), making it a good target for DM searches. We present a search for gamma rays from M31 using 1017 days of data from the High Altitude Water Cherenkov (HAWC) Observatory. With its wide field of view and constant monitoring, HAWC is well-suited to search for DM in extended targets like M31. No DM annihilation or decay signal was detected for DM masses from 1 to 100 TeV in the $b\bar{b}$, $t\bar{t}$, $\tau^{+}\tau^{-}$, $\mu^{+}\mu^{-}$, and $W^{+}W^{-}$ channels. Therefore we present limits on those processes. Our limits nicely complement the existing body of DM limits from other targets and instruments. Specifically the DM decay limits from our benchmark model are the most constraining for DM masses from 25 TeV to 100 TeV in the $b\bar{b}, t\bar{t}$ and $\mu^{+}\mu{-}$ channels. In addition to DM-specific limits, we also calculate general gamma-ray flux limits for M31 in 5 energy bins from 1 TeV to 100 TeV., Comment: published in JCAP. Figure 6 (bottom) has been corrected
Published: 2018
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55. Constraining the $\bar{p}/p$ Ratio in TeV Cosmic Rays with Observations of the Moon Shadow by HAWC

Author: 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., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., la Fuentem, E. D, Hernandez, R. Diaz, Dichiara, S., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engels, K., Enríquez-Rivera, O., Fleischhack, H., Fraija, N., Galván-Gámez, A., García-González, J. A., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hona, B., Hueyotl-Zahuantitla, F., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lee, W. H., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nayerhoda, A., Nellena, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Riviére, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Yodha, G. B., Zepeda, A., Zhou, H., and Alvarez, J. D.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: An indirect measurement of the antiproton flux in cosmic rays is possible as the particles undergo deflection by the geomagnetic field. This effect can be measured by studying the deficit in the flux, or shadow, created by the Moon as it absorbs cosmic rays that are headed towards the Earth. The shadow is displaced from the actual position of the Moon due to geomagnetic deflection, which is a function of the energy and charge of the cosmic rays. The displacement provides a natural tool for momentum/charge discrimination that can be used to study the composition of cosmic rays. Using 33 months of data comprising more than 80 billion cosmic rays measured by the High Altitude Water Cherenkov (HAWC) observatory, we have analyzed the Moon shadow to search for TeV antiprotons in cosmic rays. We present our first upper limits on the $\bar{p}/p$ fraction, which in the absence of any direct measurements, provide the tightest available constraints of $\sim1\%$ on the antiproton fraction for energies between 1 and 10 TeV., Comment: 10 pages, 5 figures. Accepted by Physical Review D
Published: 2018
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56. A Coincidence Search for Cosmic Neutrino and Gamma-Ray Emitting Sources Using IceCube and Fermi LAT Public Data

Author: Turley, C. F., Fox, D. B., Keivani, A., DeLaunay, J. J., Cowen, D. F., Mostafa, M., Solares, H. A. Ayala, and Murase, K.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present results of an archival coincidence analysis between Fermi LAT gamma-ray data and public neutrino data from the IceCube neutrino observatory's 40-string (IC40) and 59-string (IC59) observing runs. Our analysis has the potential to detect either a statistical excess of neutrino + gamma-ray ($\nu$+$\gamma$) emitting transients or, alternatively, individual high gamma-multiplicity events, as might be produced by a neutrino observed by IceCube coinciding with a LAT-detected gamma-ray burst. Dividing the neutrino data into three datasets by hemisphere (IC40, IC59-North, and IC59-South), we construct uncorrelated null distributions by Monte Carlo scrambling of the neutrino datasets. We carry out signal-injection studies against these null distributions, demonstrating sensitivity to individual $\nu$+$\gamma$ events of sufficient gamma-ray multiplicity, and to $\nu$+$\gamma$ transient populations responsible for $>$14% (IC40), $>$9% (IC59-North), or $>$8% (IC59-South) of the gamma-coincident neutrinos observed in these datasets, respectively. Analyzing the unscrambled neutrino data, we identify no individual high-significance neutrino + high gamma-multiplicity events, and no significant deviations from the test statistic null distributions. However, we observe a similar and unexpected pattern in the IC59-North and IC59-South residual distributions that we conclude reflects a possible correlation ($p=7.0\%$) between IC59 neutrino positions and persistently bright portions of the Fermi gamma-ray sky. This possible correlation should be readily testable using eight years of further data already collected by IceCube. We are currently working with Astrophysical Multimessenger Observatory Network (AMON) partner facilities to generate low-latency $\nu$+$\gamma$ alerts from Fermi LAT gamma-ray, IceCube and ANTARES neutrino data and distribute these in real time to AMON follow-up partners., Comment: 12 pages, 9 figures, 1 table
Published: 2018
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57. Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth

Author: Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Berley, D., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Enríquez-Rivera, O., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Gerhardt, M., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernández, S., Hernández-Almada, A., Hinton, J., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G., Younk, P. W., Zepeda, A., Zhou, H., Guo, F., Hahn, J., Li, H., and Zhang, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The unexpectedly high flux of cosmic ray positrons detected at Earth may originate from nearby astrophysical sources, dark matter, or unknown processes of cosmic-ray secondary production. We report the detection, using the HighAltitude Water Cherenkov Observatory (HAWC), of extended tera-electron volt gamma-ray emission coincident with the locations of two nearby middle-aged pulsars (Geminga and PSR B0656+14). The HAWC observations demonstrate that these pulsars are indeed local sources of accelerated leptons, but the measured tera-electron volt emission profile constrains the diffusion of particles away from these sources to be much slower than previously assumed. We demonstrate that the leptons emitted by these objects are therefore unlikely to be the origin of the excess positrons, which may have a more exotic origin., Comment: 16 pages (including supplementary material), 5 figures
Published: 2017
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58. A Search for Dark Matter in the Galactic Halo with HAWC

Author: Abeysekara, A. U., Albert, A. M., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., De León, C., De la Fuente, E., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Engel, K., Enríquez-Rivera, O., Fiorino, D. W., Fleischhack, H., Fraija, N., García-González, J. A., Garfias, F., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rodd, N. L., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Safdi, B. R., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G. B., Younk, P. W., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology
Abstract: The High Altitude Water Cherenkov (HAWC) gamma-ray observatory is a wide field-of-view observatory sensitive to 500 GeV - 100 TeV gamma rays and cosmic rays. With its observations over 2/3 of the sky every day, the HAWC observatory is sensitive to a wide variety of astrophysical sources, including possible gamma rays from dark matter. Dark matter annihilation and decay in the Milky Way Galaxy should produce gamma-ray signals across many degrees on the sky. The HAWC instantaneous field-of-view of 2 sr enables observations of extended regions on the sky, such as those from dark matter in the Galactic halo. Here we show limits on the dark matter annihilation cross-section and decay lifetime from HAWC observations of the Galactic halo with 15 months of data. These are some of the most robust limits on TeV and PeV dark matter, largely insensitive to the dark matter morphology. These limits begin to constrain models in which PeV IceCube neutrinos are explained by dark matter which primarily decays into hadrons., Comment: 24 pages, 11 figures
Published: 2017
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59. All-particle cosmic ray energy spectrum measured by the HAWC experiment from 10 to 500 TeV

Author: HAWC Collaboration, Alfaro, R., Alvarez, C., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Hernandez, R. Diaz, Dichiara, S., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Enriquez-Rivera, O., Fiorino, D. W., Fleischhack, H., Fraija, N., García-González, J. A., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez-Almada, A., Hinton, J., Hueyotl-Zahuantitla, F., Hui, C. M., Huntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lauer, R. J., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., López-Cámara, D., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Zepeda, A., Zhou, H., and Álvarez, J. D.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We report on the measurement of the all-particle cosmic ray energy spectrum with the High Altitude Water Cherenkov (HAWC) Observatory in the energy range 10 to 500 TeV. HAWC is a ground based air-shower array deployed on the slopes of Volcan Sierra Negra in the state of Puebla, Mexico, and is sensitive to gamma rays and cosmic rays at TeV energies. The data used in this work were taken from 234 days between June 2016 to February 2017. The primary cosmic-ray energy is determined with a maximum likelihood approach using the particle density as a function of distance to the shower core. Introducing quality cuts to isolate events with shower cores landing on the array, the reconstructed energy distribution is unfolded iteratively. The measured all-particle spectrum is consistent with a broken power law with an index of $-2.49\pm0.01$ prior to a break at $(45.7\pm0.1$) TeV, followed by an index of $-2.71\pm0.01$. The spectrum also respresents a single measurement that spans the energy range between direct detection and ground based experiments. As a verification of the detector response, the energy scale and angular resolution are validated by observation of the cosmic ray Moon shadow's dependence on energy., Comment: 16 pages, 11 figures, 4 tables, submission to Physical Review D
Published: 2017
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60. Data Acquisition Architecture and Online Processing System for the HAWC gamma-ray observatory

Author: HAWC collaboration, Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Gonzalez, J. Becerra, Belmont-Moreno, E., BenZvi, S. Y., Berley, D., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Caballero-Mora, K. S., Carramiñana, A., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Diaz-Cruz, J., Hernandez, R. Diaz, Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Fiorino, D. W., Fraija, N., Galindo, A., Garfias, F., González, M. M., Goodman, J. A., Grabski, V., Gussert, M., Hampel-Arias, Z., Harding, J. P., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linares, E. C., Linnemann, J. T., Proper, M. Longo, Luna-García, R., Malone, K., Marinelli, A., Marinelli, S. S., Martinez, O., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A. J., McEnery, J., Torres, E. Mendoza, Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Rivière, C., Rosa-González, D., Ruiz-Velasco, E., Ryan, J., Salazar, H., Greus, F. Salesa, Sanchez, F. E., Sandoval, A., Schneider, M., Silich, S., Sinni, G., Smith, A. J., Woodle, K. Sparks, Springer, R. W., Taboada, I., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: The High Altitude Water Cherenkov observatory (HAWC) is an air shower array devised for TeV gamma-ray astronomy. HAWC is located at an altitude of 4100 m a.s.l. in Sierra Negra, Mexico. HAWC consists of 300 Water Cherenkov Detectors, each instrumented with 4 photomultiplier tubes (PMTs). HAWC re-uses the Front-End Boards from the Milagro experiment to receive the PMT signals. These boards are used in combination with Time to Digital Converters (TDCs) to record the time and the amount of light in each PMT hit (light flash). A set of VME TDC modules (128 channels each) is operated in a continuous (dead time free) mode. The TDCs are read out via the VME bus by Single-Board Computers (SBCs), which in turn are connected to a gigabit Ethernet network. The complete system produces ~ 500 MB/s of raw data. A high-throughput data processing system has been designed and built to enable real-time data analysis. The system relies on off-the-shelf hardware components, an open-source software technology for data transfers (ZeroMQ) and a custom software framework for data analysis (AERIE). Multiple trigger and reconstruction algorithms can be combined and run on blocks of data in a parallel fashion, producing a set of output data streams which can be analyzed in real time with minimal latency (< 5 s). This paper provides an overview of the hardware set-up and an in-depth description of the software design, covering both the TDC data acquisition system and the real-time data processing system. The performance of these systems is also discussed., Comment: 14 pages, 3 figures, submitted to Nucl. Instrum. Meth. A
Published: 2017
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61. HAWC Contributions to the 35th International Cosmic Ray Conference (ICRC2017)

Author: Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Gonzalez, J. Becerra, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Berley, D., Bernal, A., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Diaz-Cruz, L., Díaz-Vélez, J. C., Dichiara, S., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engel, K., Enriquez-Rivera, O., Fick, B., Fiorino, D. W., Fleischhack, H., Flores, J. L., Fraija, N., García-González, J. A., Garcia-Luna, J. L., Garcia-Torales, G., Garfias, F., Gerhardt, M., González, M. M., Muñoz, A. González, Goodman, J. A., Gussert, M., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hinton, J., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Proper, M. Longo, López-Coto, R., Raya, G. Luis, Luna-García, R., Malone, K., Marandon, V., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A. J., McEnery, J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Ryan, J., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Smith, A. W., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Yodh, G. B., Younk, P. W., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract: List of proceedings from the HAWC Collaboration presented at the 35th International Cosmic Ray Conference, 12 July - 20 July 2017, Bexco, Busan, Korea., Comment: List of proceedings from the HAWC Collaboration presented at ICRC2017. Corrected typos in the index of the previous version. Follow the "HTML" link to access the list
Published: 2017

62. Dark Matter Limits From Dwarf Spheroidal Galaxies with The HAWC Gamma-Ray Observatory

Author: Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Bautista-Elivar, N., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Castillo, M., Cotti, U., De León, C., De la Fuente, E., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., González, M. M., Goodman, J. A., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Iriarte, A., Joshi, V., Kaufmann, S., Kieda, D., Lauer, R. J., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, López-Coto, R., Malone, K., Marinelli, S. S., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Weisgarber, T., Yapici, T., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract: The High Altitude Water Cherenkov (HAWC) gamma-ray observatory is a wide field of view observatory sensitive to 500 GeV - 100 TeV gamma rays and cosmic rays. It can also perform diverse indirect searches for dark matter (DM) annihilation and decay. Among the most promising targets for the indirect detection of dark matter are dwarf spheroidal galaxies. These objects are expected to have few astrophysical sources of gamma rays but high dark matter content, making them ideal candidates for an indirect dark matter detection with gamma rays. Here we present individual limits on the annihilation cross section and decay lifetime for 15 dwarf spheroidal galaxies within the HAWC field-of-view, as well as their combined limit. These are the first limits on the annihilation cross section and decay lifetime using data collected with HAWC., Comment: 18 pages, 6 figures, 2 tables
Published: 2017
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63. Search for very-high-energy emission from Gamma-ray Bursts using the first 18 months of data from the HAWC Gamma-ray Observatory

Author: The HAWC collaboration, Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Gerhardt, M., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez-Almada, A., Hernandez, S., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Noriega-Papaqui, R., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Younk, P. W., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The High Altitude Water Cherenkov (HAWC) Gamma-ray Observatory is an extensive air shower detector operating in central Mexico, which has recently completed its first two years of full operations. If for a burst like GRB 130427A at a redshift of 0.34 and a high-energy component following a power law with index -1.66, the high-energy component is extended to higher energies with no cut-off other than from extragalactic background light attenuation, HAWC would observe gamma rays with a peak energy of $\sim$300 GeV. This paper reports the results of HAWC observations of 64 gamma-ray bursts (GRBs) detected by $\mathit{Swift}$ and $\mathit{Fermi}$, including three GRBs that were also detected by the Large Area Telescope ($\mathit{Fermi}$-LAT). An ON/OFF analysis method is employed, searching on the time scale given by the observed light curve at keV-MeV energies and also on extended time scales. For all GRBs and time scales, no statistically significant excess of counts is found and upper limits on the number of gamma rays and the gamma-ray flux are calculated. GRB 170206A, the third brightest short GRB detected by the Gamma-ray Burst Monitor on board the $\mathit{Fermi}$ satellite ($\mathit{Fermi}$-GBM) and also detected by the LAT, occurred very close to zenith. The LAT measurements can neither exclude the presence of a synchrotron self-Compton (SSC) component nor constrain its spectrum. Instead, the HAWC upper limits constrain the expected cut-off in an additional high-energy component to be less than $100~\rm{GeV}$ for reasonable assumptions about the energetics and redshift of the burst., Comment: 19 pages, 6 figures, published in ApJ
Published: 2017
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64. The HAWC real-time flare monitor for rapid detection of transient events

Author: Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Gonzalez, J. Becerra, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De la Fuente, E., De León, C., Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engel, K., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Gerhardt, M., González, M. M., Muñoz, A. González, Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., López-Cámara, D., López-Coto, R., Raya, G. Luis, Luna-García, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Younk, P. W., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present the development of a real-time flare monitor for the High Altitude Water Cherenkov (HAWC) observatory. The flare monitor has been fully operational since 2017 January and is designed to detect very high energy (VHE; $E\gtrsim100$ GeV) transient events from blazars on time scales lasting from 2 minutes to 10 hours in order to facilitate multiwavelength and multimessenger studies. These flares provide information for investigations into the mechanisms that power the blazars' relativistic jets and accelerate particles within them, and they may also serve as probes of the populations of particles and fields in intergalactic space. To date, the detection of blazar flares in the VHE range has relied primarily on pointed observations by imaging atmospheric Cherenkov telescopes. The recently completed HAWC observatory offers the opportunity to study VHE flares in survey mode, scanning 2/3 of the entire sky every day with a field of view of $\sim$1.8 steradians. In this work, we report on the sensitivity of the HAWC real-time flare monitor and demonstrate its capabilities via the detection of three high-confidence VHE events in the blazars Markarian 421 and Markarian 501., Comment: 19 pages, 14 figures, revised version submitted to The Astrophysical Journal on 1 June 2017
Published: 2017
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65. Daily monitoring of TeV gamma-ray emission from Mrk 421, Mrk 501, and the Crab Nebula with HAWC

Author: Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Gonzalez, J. Becerra, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Gerhardt, M., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Younk, P. W., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present results from daily monitoring of gamma rays in the energy range $\sim0.5$ to $\sim100$ TeV with the first 17 months of data from the High Altitude Water Cherenkov (HAWC) Observatory. Its wide field of view of 2 steradians and duty cycle of $>95$% are unique features compared to other TeV observatories that allow us to observe every source that transits over HAWC for up to $\sim6$ hours each sidereal day. This regular sampling yields unprecedented light curves from unbiased measurements that are independent of seasons or weather conditions. For the Crab Nebula as a reference source we find no variability in the TeV band. Our main focus is the study of the TeV blazars Markarian (Mrk) 421 and Mrk 501. A spectral fit for Mrk 421 yields a power law index $\Gamma=2.21 \pm0.14_{\mathrm{stat}}\pm0.20_{\mathrm{sys}}$ and an exponential cut-off $E_0=5.4 \pm 1.1_{\mathrm{stat}}\pm 1.0_{\mathrm{sys}}$ TeV. For Mrk 501, we find an index $\Gamma=1.60\pm 0.30_{\mathrm{stat}} \pm 0.20_{\mathrm{sys}}$ and exponential cut-off $E_0=5.7\pm 1.6_{\mathrm{stat}} \pm 1.0_{\mathrm{sys}}$ TeV. The light curves for both sources show clear variability and a Bayesian analysis is applied to identify changes between flux states. The highest per-transit fluxes observed from Mrk 421 exceed the Crab Nebula flux by a factor of approximately five. For Mrk 501, several transits show fluxes in excess of three times the Crab Nebula flux. In a comparison to lower energy gamma-ray and X-ray monitoring data with comparable sampling we cannot identify clear counterparts for the most significant flaring features observed by HAWC., Comment: 18 pages, 10 figures, accepted for publication in The Astrophysical Journal
Published: 2017
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66. Search for Very High Energy Gamma Rays from the Northern $\textit{Fermi}$ Bubble Region with HAWC

Author: Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Berley, D., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, De León, C., De la Fuente, E., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Fick, B., Fiorino, D. W., Fleischhack, H., Fraija, N., García-González, J. A., Garfias, F., Gerhardt, M., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hinton, J., Hona, B., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G. B., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present a search of very high energy gamma-ray emission from the Northern $\textit{Fermi}$ Bubble region using data collected with the High Altitude Water Cherenkov (HAWC) gamma-ray observatory. The size of the data set is 290 days. No significant excess is observed in the Northern $\textit{Fermi}$ Bubble region, hence upper limits above $1\,\text{TeV}$ are calculated. The upper limits are between $3\times 10^{-7}\,\text{GeV}\, \text{cm}^{-2}\, \text{s}^{-1}\,\text{sr}^{-1}$ and $4\times 10^{-8}\,\text{GeV}\,\text{cm}^{-2}\,\text{s}^{-1}\,\text{sr}^{-1}$. The upper limits disfavor a proton injection spectrum that extends beyond $100\,\text{TeV}$ without being suppressed. They also disfavor a hadronic injection spectrum derived from neutrino measurements.
Published: 2017
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67. Multiwavelength follow-up of a rare IceCube neutrino multiplet

Author: Aartsen, M. G., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., Samarai, I. Al, Altmann, D., Andeen, K., Anderson, T., Ansseau, I., Anton, G., Archinger, M., Argüelles, C., Auffenberg, J., Axani, S., Bai, X., Barwick, S. W., Baum, V., Bay, R., Beatty, J. J., Tjus, J. Becker, Becker, K. -H., BenZvi, S., Berley, D., Bernardini, E., Bernhard, A., Besson, D. Z., Binder, G., Bindig, D., Blaufuss, E., Blot, S., Bohm, C., Börner, M., Bos, F., Bose, D., Böser, S., Botner, O., Braun, J., Brayeur, L., Bretz, H. -P., Bron, S., Burgman, A., Carver, T., Casier, M., Cheung, E., Chirkin, D., Christov, A., Clark, K., Classen, L., Coenders, S., Collin, G. H., Conrad, J. M., Cowen, D. F., Cross, R., Day, M., de, J. P. A. M., ré, De Clercq, C., Rosendo, E. del Pino, Dembinski, H., De Ridder, S., Desiati, P., de Vries, K. D., de Wasseige, G., de With, M., DeYoung, T., di Lorenzo, V., Dujmovic, H., Dumm, J. P., Dunkman, M., Eberhardt, B., Ehrhardt, T., Eichmann, B., Eller, P., Euler, S., Evenson, P. A., Fahey, S., Fazely, A. R., Feintzeig, J., Felde, J., Filimonov, K., Finley, C., Flis, S., Fösig, C. -C., Franckowiak, A., Friedman, E., Fuchs, T., Gaisser, T. K., Gallagher, J., Gerhardt, L., Ghorbani, K., Giang, W., Gladstone, L., Glauch, T., Glüsenkamp, T., Goldschmidt, A., Gonzalez, J. G., Grant, D., Griffith, Z., Haack, C., Hallgren, A., Halzen, F., Hansen, E., Hansmann, T., Hanson, K., Hebecker, D., Heereman, D., Helbing, K., Hellauer, R., Hickford, S., Hignight, J., Hill, G. C., Hoffman, K. D., Hoffmann, R., Hoshina, K., Huang, F., Huber, M., Hultqvist, K., In, S., Ishihara, A., Jacobi, E., Japaridze, G. S., Jeong, M., Jero, K., Jones, B. J. P., Kang, W., Kappes, A., Karg, T., Karle, A., Katz, U., Kauer, M., Keivani, A., Kelley, J. L., Kheirandish, A., Kim, J., Kim, M., Kintscher, T., Kiryluk, J., Kittler, T., Klein, S. R., Kohnen, G., Koirala, R., Kolanoski, H., Konietz, R., Köpke, L., Kopper, C., Kopper, S., Koskinen, D. J., Kowalski, M., Krings, K., Kroll, M., Krückl, G., Krüger, C., Kunnen, J., Kunwar, S., Kurahashi, N., Kuwabara, T., Kyriacou, A., Labare, M., Lanfranchi, J. L., Larson, M. J., Lauber, F., Lesiak-Bzdak, M., Leuermann, M., Lu, L., Lünemann, J., Madsen, J., Maggi, G., Mahn, K. B. M., Mancina, S., Mandelartz, M., Maruyama, R., Mase, K., Maunu, R., McNally, F., Meagher, K., Medici, M., Meier, M., Menne, T., Merino, G., Meures, T., Miarecki, S., Micallef, J., Momenté, G., Montaruli, T., Moulai, M., Nahnhauer, R., Naumann, U., Neer, G., Niederhausen, H., Nowicki, S. C., Nygren, D. R., Pollmann, A. Obertacke, Olivas, A., O'Murchadha, A., Palczewski, T., Pandya, H., Pankova, D. V., Peiffer, P., Penek, Ö., Pepper, J. A., Heros, C. Pérez de los, Pieloth, D., Pinat, E., Price, P. B., Przybylski, G. T., Quinnan, M., Raab, C., Rädel, L., Rameez, M., Rawlins, K., Reimann, R., Relethford, B., Relich, M., Resconi, E., Rhode, W., Richman, M., Riedel, B., Robertson, S., Rongen, M., Rott, C., Ruhe, T., Ryckbosch, D., Rysewyk, D., Sabbatini, L., Herrera, S. E. Sanchez, Sandrock, A., Sandroos, J., Sarkar, S., Satalecka, K., Schlunder, P., Schmidt, T., Schoenen, S., Schöneberg, S., Schumacher, L., Seckel, D., Seunarine, S., Soldin, D., Song, M., Spiczak, G. M., Spiering, C., Stachurska, J., Stanev, T., Stasik, A., Stettner, J., Steuer, A., Stezelberger, T., Stokstad, R. G., Stößl, A., Ström, R., Strotjohann, N. L., Sullivan, G. W., Sutherland, M., Taavola, H., Taboada, I., Tatar, J., Tenholt, F., Ter-Antonyan, S., Terliuk, A., Tešić, G., Tilav, S., Toale, P. A., Tobin, M. N., Toscano, S., Tosi, D., Tselengidou, M., Tung, C. F., Turcati, A., Unger, E., Usner, M., Vandenbroucke, J., van Eijndhoven, N., Vanheule, S., van Rossem, M., van Santen, J., Vehring, M., Voge, M., Vogel, E., Vraeghe, M., Walck, C., Wallace, A., Wallraff, M., Wandkowsky, N., Waza, A., Weaver, Ch., Weiss, M. J., Wendt, C., Westerhoff, S., Whelan, B. J., Wickmann, S., Wiebe, K., Wiebusch, C. H., Wille, L., Williams, D. R., Wills, L., Wolf, M., Wood, T. R., Woolsey, E., Woschnagg, K., Xu, D. L., Xu, X. W., Xu, Y., Yanez, J. P., Yodh, G., Yoshida, S., Zoll, M., Stanek, K. Z., Shappee, B. J., Kochanek, C. S., Holoien, T. W. -S., Prieto, J. L., Fox, D. B., DeLaunay, J. J., Turley, C. F., Barthelmy, S. D., Lien, A. Y., Mészáros, P., Murase, K., Kocevski, D., Buehler, R., Giomi, M., Racusin, J. L., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Becerril, N. Baustista-Elivar A., Belmont-Moreno, E., Bernal, A., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., de León, S. Coutiño, de la Fuente, E., De León, C., Hernandez, R. Diaz, Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engel, K., Fiorino, D. W., Fraija, N., García-González, J. A., Gerhardt, M., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Raya, G. Luis, Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Wisher, I. G., Wood, J., Yapici, T., Zepeda, A., Zhou, H., Arcavi, I., Hosseinzadeh, G., Howell, D. A., Valenti, S., McCully, C., Lipunov, V. M., Gorbovskoy, E. S., Tiurina, N. V., Balanutsa, P. V., Kuznetsov, A. S., Kornilov, V. G., Chazov, V., Budnev, N. M., Gress, O. A., Ivanov, K. I., Tlatov, A. G., Lopez, R. Rebolo, Serra-Ricart, M., Evans, P. A., Kennea, J. A., Gehrels, N., Osborne, J. P., Page, K. L., Abeysekara, A. U., Archer, A., Benbow, W., Bird, R., Brantseg, T., Bugaev, V., Cardenzana, J. V, Connolly, M. P., Cui, W., Falcone, A., Feng, Q., Finley, J. P., Fleischhack, H., Fortson, L., Furniss, A., Griffin, S., Grube, J., Hütten, M., Hervet, O., Holder, J., Hughes, G., Humensky, T. B., Johnson, C. A., Kaaret, P., Kar, P., Kelley-Hoskins, N., Kertzman, M., Krause, M., Kumar, S., Lang, M. J., Lin, T. T. Y., McArthur, S., Moriarty, P., Mukherjee, R., Nieto, D., Ong, R. A., Otte, A. N., Pohl, M., Popkow, A., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Richards, G. T., Roache, E., Rulten, C., Sadeh, I., Santander, M., Sembroski, G. H., Staszak, D., Trépanier, S., Tyler, J., Wakely, S. P., Weinstein, A., Wilcox, P., Wilhelm, A., Williams, D. A., Zitzer, B., Bellm, E., Cano, Z., Gal-Yam, A., Kann, D. A., Ofek, E. O., Rigault, M., and Soumagnac, M.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: On February 17 2016, the IceCube real-time neutrino search identified, for the first time, three muon neutrino candidates arriving within 100 s of one another, consistent with coming from the same point in the sky. Such a triplet is expected once every 13.7 years as a random coincidence of background events. However, considering the lifetime of the follow-up program the probability of detecting at least one triplet from atmospheric background is 32%. Follow-up observatories were notified in order to search for an electromagnetic counterpart. Observations were obtained by Swift's X-ray telescope, by ASAS-SN, LCO and MASTER at optical wavelengths, and by VERITAS in the very-high-energy gamma-ray regime. Moreover, the Swift BAT serendipitously observed the location 100 s after the first neutrino was detected, and data from the Fermi LAT and HAWC observatory were analyzed. We present details of the neutrino triplet and the follow-up observations. No likely electromagnetic counterpart was detected, and we discuss the implications of these constraints on candidate neutrino sources such as gamma-ray bursts, core-collapse supernovae and active galactic nucleus flares. This study illustrates the potential of and challenges for future follow-up campaigns., Comment: 23 pages, 13 figures, accepted by A&A on July 30 2017
Published: 2017
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68. The 2HWC HAWC Observatory Gamma Ray Catalog

Author: Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Gonzalez, J. Becerra, Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Berley, D., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, de la Fuente, E., De León, C., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Fiorino, D. W., Fraija, N., García-González, J. A., Garfias, F., Gerhardt, M., Muñoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hinton, J., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Vianello, G., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Younk, P. W., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present the first catalog of TeV gamma-ray sources realized with the recently completed High Altitude Water Cherenkov Observatory (HAWC). It is the most sensitive wide field-of-view TeV telescope currently in operation, with a 1-year survey sensitivity of ~5-10% of the flux of the Crab Nebula. With an instantaneous field of view >1.5 sr and >90% duty cycle, it continuously surveys and monitors the sky for gamma ray energies between hundreds GeV and tens of TeV. HAWC is located in Mexico at a latitude of 19 degree North and was completed in March 2015. Here, we present the 2HWC catalog, which is the result of the first source search realized with the complete HAWC detector. Realized with 507 days of data and represents the most sensitive TeV survey to date for such a large fraction of the sky. A total of 39 sources were detected, with an expected contamination of 0.5 due to background fluctuation. Out of these sources, 16 are more than one degree away from any previously reported TeV source. The source list, including the position measurement, spectrum measurement, and uncertainties, is reported. Seven of the detected sources may be associated with pulsar wind nebulae, two with supernova remnants, two with blazars, and the remaining 23 have no firm identification yet., Comment: Submitted 2017/02/09 to the Astrophysical Journal
Published: 2017
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69. Observation of the Crab Nebula with the HAWC Gamma-Ray Observatory

Author: Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Bautista-Elivar, N., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Berley, D., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, de la Fuente, E., De León, C., DeYoung, T., Dingus, B. L., DuVernois, M. A., Díaz-Vélez, J. C., Ellsworth, R. W., Fiorino, D. W., Fraija, N., García-González, J. A., Gerhardt, M., Munoz, A. González, González, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hinton, J., Hui, C. M., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Kieda, D., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Raya, G. Luis, Luna-García, R., López-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Martínez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G. B., Younk, P. W., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The Crab Nebula is the brightest TeV gamma-ray source in the sky and has been used for the past 25 years as a reference source in TeV astronomy, for calibration and verification of new TeV instruments. The High Altitude Water Cherenkov Observatory (HAWC), completed in early 2015, has been used to observe the Crab Nebula at high significance across nearly the full spectrum of energies to which HAWC is sensitive. HAWC is unique for its wide field-of-view, nearly 2 sr at any instant, and its high-energy reach, up to 100 TeV. HAWC's sensitivity improves with the gamma-ray energy. Above $\sim$1 TeV the sensitivity is driven by the best background rejection and angular resolution ever achieved for a wide-field ground array. We present a time-integrated analysis of the Crab using 507 live days of HAWC data from 2014 November to 2016 June. The spectrum of the Crab is fit to a function of the form $\phi(E) = \phi_0 (E/E_{0})^{-\alpha -\beta\cdot{\rm{ln}}(E/E_{0})}$. The data is well-fit with values of $\alpha=2.63\pm0.03$, $\beta=0.15\pm0.03$, and log$_{10}(\phi_0~{\rm{cm}^2}~{\rm{s}}~{\rm{TeV}})=-12.60\pm0.02$ when $E_{0}$ is fixed at 7 TeV and the fit applies between 1 and 37 TeV. Study of the systematic errors in this HAWC measurement is discussed and estimated to be $\pm$50\% in the photon flux between 1 and 37 TeV. Confirmation of the Crab flux serves to establish the HAWC instrument's sensitivity for surveys of the sky. The HAWC survey will exceed sensitivity of current-generation observatories and open a new view of 2/3 of the sky above 10 TeV., Comment: Submitted 2017/01/06 to the Astrophysical Journal
Published: 2017
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70. Search for TeV Gamma-Ray Emission from Point-like Sources in the Inner Galactic Plane with a Partial Configuration of the HAWC Observatory

Author: Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Reyes, A. D. Becerril, Belmont, E., BenZvi, S. Y., Bernal, A., Braun, J., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, de la Fuente, E., De León, C., DeYoung, T., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Enriquez-Rivera, O., Fiorino, D. W., Fraija, N., Garfias, F., González, M. M., Goodman, J. A., Gussert, M., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hüntemeyer, P., Hui, C. M., Imran, A., Iriarte, A., Karn, P., Kieda, D., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longo, M., Raya, G. Luis, Malone, K., Marinelli, A., Marinelli, S. S., Martinez, H., Martinez, O., Martínez-Castro, J., Matthews, J. A. J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Noriega-Papaqui, R., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rivière, C., Rosa-González, D., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Sinnis, G., Smith, A. J., Woodle, K. Sparks, Springer, R. W., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Vrabel, K., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: A survey of the inner Galaxy region of Galactic longitude l in [+15, +50] degree and latitude b in [-4,+4] degree is performed using one-third of the High Altitude Water Cherenkov (HAWC) Observatory operated during its construction phase. To address the ambiguities arising from unresolved sources in the data, we use a maximum likelihood technique to identify point source candidates. Ten sources and candidate sources are identified in this analysis. Eight of these are associated with known TeV sources but not all have differential fluxes compatible with previous measurements. Three sources are detected with significances $>5\,\sigma$ after accounting for statistical trials, and are associated with known TeV sources., Comment: Submitted to ApJ, 34 pages, 6 figures. Contact authors: Hao Zhou and C. Michelle Hui
Published: 2015
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71. Fermi Bubbles with HAWC

Author: Solares, H. A. Ayala, Hui, C. M., and Hüntemeyer, P.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The Fermi Bubbles, which comprise two large and homogeneous regions of spectrally hard gamma-ray emission extending up to $55^{o}$ above and below the Galactic Center, were first noticed in GeV gamma-ray data from the Fermi Telescope in 2010. The mechanism or mechanisms which produce the observed hard spectrum are not understood. Although both hadronic and lep- tonic models can describe the spectrum of the bubbles, the leptonic model can also explain similar structures observed in microwave data from the WMAP and Planck satellites. Recent publications show that the spectrum of the Fermi Bubbles is well described by a power law with an exponential cutoff in the energy range of 100MeV to 500GeV. Observing the Fermi Bubbles at higher gamma-ray energies will help constrain the origin of the bubbles. A steeper cutoff will favor a leptonic model. The High Altitude Water Cherenkov (HAWC) Observatory, located 4100m above sea level in Mexico, is designed to measure high-energy gamma rays between 100GeV to 100TeV. With a large field of view and good sensitivity to spatially extended sources, HAWC is the best observatory suited to look for extended regions like the Fermi Bubbles at TeV energies. We will present results from a preliminary analysis of the Fermi Bubble visible to HAWC in the Galactic Northern Hemisphere during the ICRC conference., Comment: Presented at the 34th International Cosmic Ray Conference (ICRC2015), The Hague, The Netherlands. See arXiv:1508.03327 for all HAWC contributions
Published: 2015

72. HAWC Contributions to the 34th International Cosmic Ray Conference (ICRC2015)

Author: HAWC Collaboration, Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Gonzalez, J. Becerra, Becerril, A., Belmont, E., BenZvi, S. Y., Berley, D., Bernal, A., Braun, J., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Castillo, M., Cotti, U., Cotzomi, J., de León, S. Coutiño, de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Diaz-Cruz, L., Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engel, K., Enriquez-Rivera, O., Fick, B., Fiorino, D. W., Flores, J. L., Fraija, N., Garcia-Torales, G., Garfias, F., González, M. M., Goodman, J. A., Gussert, M., Hampel-Arias, Z., Hansen, P., Harding, J. Patrick, Hernandez, S., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Proper, M. Longo, Raya, G. Luis, Luna-García, R., Malone, K., Marinelli, A., Marinelli, S. S., Martinez, H., Martinez, O., Martínez-Castro, J., Matthews, J. A. J., McEnery, J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Nisa, M. Un, Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Ren, Z., Rho, C. D., Rivière, C., Rosa-González, D., Ryan, J., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Sinnis, G., Smith, A. J., Smith, A. W., Woodle, K. Sparks, Springer, R. W., Taboada, I., Tibolla, O., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G. B., Younk, P. W., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract: List of proceedings from the HAWC Collaboration presented at the 34th International Cosmic Ray Conference, 30 July - 6 August 2015, The Hague, The Netherlands., Comment: List of proceedings from the HAWC Collaboration presented at ICRC2015. Follow the "HTML" link to access the list
Published: 2015

73. Search for gamma-rays from the unusually bright GRB 130427A with the HAWC Gamma-ray Observatory

Author: The HAWC collaboration, Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., BenZvi, S. Y., Rosales, M. Bonilla, Braun, J., Caballero-Mora, K. S., Carramiñana, A., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Fiorino, D. W., Fraija, N., Galindo, A., Garfias, F., González, M. M., Goodman, J. A., Gussert, M., Hampel-Arias, Z., Harding, J. P., Hüntemeyer, P., Hui, C. M., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longo, M., Luna-García, R., Malone, K., Marinelli, A., Marinelli, S. S., Martinez, H., Martinez, O., Martínez-Castro, J., Matthews, J. A., Torres, E. Mendoza, Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T. O., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Rivière, C., Rosa-González, D., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Sinnis, G., Smith, A. J., Woodle, K. Sparks, Springer, R. W., Taboada, I., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The first limits on the prompt emission from the long gamma-ray burst (GRB) 130427A in the $>100\nobreakspace\rm{GeV}$ energy band are reported. GRB 130427A was the most powerful burst ever detected with a redshift $z\lesssim0.5$ and featured the longest lasting emission above $100\nobreakspace\rm{MeV}$. The energy spectrum extends at least up to $95\nobreakspace\rm{GeV}$, clearly in the range observable by the High Altitude Water Cherenkov (HAWC) Gamma-ray Observatory, a new extensive air shower detector currently under construction in central Mexico. The burst occurred under unfavourable observation conditions, low in the sky and when HAWC was running 10% of the final detector. Based on the observed light curve at MeV-GeV energies, eight different time periods have been searched for prompt and delayed emission from this GRB. In all cases, no statistically significant excess of counts has been found and upper limits have been placed. It is shown that a similar GRB close to zenith would be easily detected by the full HAWC detector, which will be completed soon. The detection rate of the full HAWC detector may be as high as one to two GRBs per year. A detection could provide important information regarding the high energy processes at work and the observation of a possible cut-off beyond the $\mathit{Fermi}$-LAT energy range could be the signature of gamma-ray absorption, either in the GRB or along the line of sight due to the extragalactic background light., Comment: 10 pages, 4 figures, published in ApJ
Published: 2014
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74. Observation of Small-scale Anisotropy in the Arrival Direction Distribution of TeV Cosmic Rays with HAWC

Author: Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Belmont, E., BenZvi, S. Y., Berley, D., Rosales, M. Bonilla, Braun, J., Caballero-Mora, K. S., Carramiñana, A., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Fiorino, D. W., Fraija, N., Galindo, A., Garfias, F., González, M. M., Goodman, J. A., Gussert, M., Hampel-Arias, Z., Harding, J. P., Hüntemeyer, P., Hui, C. M., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linnemann, J. T., Longo, M., Luna-García, R., Malone, K., Marinelli, A., Marinelli, S. S., Martinez, H., Martinez, O., Martínez-Castro, J., Matthews, J. A. J., McEnery, J., Torres, E. Mendoza, Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Rivière, C., Rosa-González, D., Ruiz-Velasco, E., Ryan, J., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Sinnis, G., Smith, A. J., Woodle, K. Sparks, Springer, R. W., Taboada, I., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The High-Altitude Water Cherenkov (HAWC) Observatory is sensitive to gamma rays and charged cosmic rays at TeV energies. The detector is still under construction, but data acquisition with the partially deployed detector started in 2013. An analysis of the cosmic-ray arrival direction distribution based on $4.9\times 10^{10}$ events recorded between June 2013 and February 2014 shows anisotropy at the $10^{-4}$ level on angular scales of about $10^\circ$. The HAWC cosmic-ray sky map exhibits three regions of significantly enhanced cosmic-ray flux; two of these regions were first reported by the Milagro experiment. A third region coincides with an excess recently reported by the ARGO-YBJ experiment. An angular power spectrum analysis of the sky shows that all terms up to $\ell=15$ contribute significantly to the excesses., Comment: 12 pages, 11 figures. Accepted by The Astrophysical Journal
Published: 2014
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75. VAMOS: a Pathfinder for the HAWC Gamma-Ray Observatory

Author: Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Ángeles, F., Arceo, R., Arteaga-Velázquez, J. C., Avila-Aroche, A., Solares, H. A. Ayala, Badillo, C., Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Gonzalez, J. Becerra, Belmont, E., Benítez, E., BenZvi, S. Y., Berley, D., Bernal, A., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Caballero-Mora, K. S., Cabrera, I., Carramiñana, A., Castañeda-Martínez, L., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Diaz-Azuara, A., Diaz-Cruz, L., Hernandez, R. Diaz, Díaz-Vélez, J. C., Dingus, B. L., Dultzin, D., DuVernois, M. A., Ellsworth, R. W., Fernandez, A., Fiorino, D. W., Fraija, N., Galindo, A., García-Torales, G., Garfias, F., González, A., González, L. X., González, M. M., Goodman, J. A., Grabski, V., Gussert, M., Guzmán-Cerón, C., Hampel-Arias, Z., Harding, J. P., Hernández-Cervantes, L., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Langarica, R., Lara, A., Lara, G., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linares, E. C., Linnemann, J. T., Longo, M., Luna-Garcia, R., Marinelli, A., Martínez, L. A., Martínez, H., Martínez, O., Martínez-Castro, J., Martos, M., Matthews, J. A. J., McEnery, J., Torres, E. Mendoza, Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nava, J., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Page, D. P., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Ramírez, I., Renter, A., Rivière, C., Rosa-González, D., Ruiz-Sala, F., Ruiz-Velasco, E. L., Ryan, J., Sacahui, J. R., Salazar, H., Salesa, F., Sandoval, A., Santos, E., Schneider, M., Silich, S., Sinnis, G., Smith, A. J., Woodle, K. Sparks, Springer, R. W., Suarez, F., Taboada, I., Tepe, A., Toale, P. A., Tollefson, K., Torres, I., Tinoco, S., Ukwatta, T. N., Galicia, J. F. Valdés, Vanegas, P., Vázquez, A., Villaseñor, L., Wall, W., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: VAMOS was a prototype detector built in 2011 at an altitude of 4100m a.s.l. in the state of Puebla, Mexico. The aim of VAMOS was to finalize the design, construction techniques and data acquisition system of the HAWC observatory. HAWC is an air-shower array currently under construction at the same site of VAMOS with the purpose to study the TeV sky. The VAMOS setup included six water Cherenkov detectors and two different data acquisition systems. It was in operation between October 2011 and May 2012 with an average live time of 30%. Besides the scientific verification purposes, the eight months of data were used to obtain the results presented in this paper: the detector response to the Forbush decrease of March 2012, and the analysis of possible emission, at energies above 30 GeV, for long gamma-ray bursts GRB111016B and GRB120328B., Comment: Accepted for pubblication in Astroparticle Physics Journal (20 pages, 10 figures). Corresponding authors: A.Marinelli and D.Zaborov
Published: 2014
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76. Milagro Limits and HAWC Sensitivity for the Rate-Density of Evaporating Primordial Black Holes

Author: Abdo, A. A., Abeysekara, A. U., Alfaro, R., Allen, B. T., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Aune, T., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Gonzalez, J. Becerra, Belmont, E., BenZvi, S. Y., Berley, D., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Caballero-Mora, K. S., Carramiñana, A., Castillo, M., Chen, C., Christopher, G. E., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Diaz-Cruz, L., Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Fiorino, D. W., Fraija, N., Galindo, A., Garfias, F., González, M. M., Goodman, J. A., Grabski, V., Gussert, M., Hampel-Arias, Z., Harding, J. P., Hays, E., Hoffman, C. M., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kolterman, B. E., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linares, E. C., Linnemann, J. T., Longo, M., Luna-GarcIa, R., MacGibbon, J. H., Marinelli, A., Marinelli, S. S., Martinez, H., Martinez, O., Martínez-Castro, J., Matthews, J. A. J., McEnery, J., Torres, E. Mendoza, Mincer, A. I., Miranda-Romagnoli, P., Moreno, E., Morgan, T., Mostafá, M., Nellen, L., Nemethy, P., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Rivière, C., Rosa-González, D., Ryan, J., Salazar, H., Salesa, F., Sandoval, A., Parkinson, P. M. Saz, Schneider, M., Shoup, A., Silich, S., Sinnis, G., Smith, A. J., Stump, D., Woodle, K. Sparks, Springer, R. W., Taboada, I., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Vasileiou, V., Villaseñor, L., Walker, G. P., Weisgarber, T., Westerhoff, S., Williams, D. A., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: Primordial Black Holes (PBHs) are gravitationally collapsed objects that may have been created by density fluctuations in the early universe and could have arbitrarily small masses down to the Planck scale. Hawking showed that due to quantum effects, a black hole has a temperature inversely proportional to its mass and will emit all species of fundamental particles thermally. PBHs with initial masses of ~5.0 x 10^14 g should be expiring in the present epoch with bursts of high-energy particles, including gamma radiation in the GeV - TeV energy range. The Milagro high energy observatory, which operated from 2000 to 2008, is sensitive to the high end of the PBH evaporation gamma-ray spectrum. Due to its large field-of-view, more than 90% duty cycle and sensitivity up to 100 TeV gamma rays, the Milagro observatory is well suited to perform a search for PBH bursts. Based on a search on the Milagro data, we report new PBH burst rate density upper limits over a range of PBH observation times. In addition, we report the sensitivity of the Milagro successor, the High Altitude Water Cherenkov (HAWC) observatory, to PBH evaporation events., Comment: Accepted to Astroparticle Physics Journal (25 Pages, 3 figures and 7 tables). Corresponding author: T. N. Ukwatta
Published: 2014
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77. The Sensitivity of HAWC to High-Mass Dark Matter Annihilations

Author: Abeysekara, A. U., Alfaro, R., Alvarez, C., Alvarez, J. D., Arceo, R., Arteaga-Velazquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Gonzalez, J. Becerra, Belmont, E., BenZvi, S. Y., Berley, D., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Caballero-Mora, K. S., Carraminana, A., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De Leon, C., DeYoung, T., Hernandez, R. Diaz, Diaz-Cruz, L., Diaz-Velez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., E., S. F., Fiorino, D. W., Fraija, N., Galindo, A., Garfias, F., Gonzalez, M. M., Goodman, J. A., Grabski, V., Gussert, M., Hampel-Arias, Z., Harding, J. P., Hui, C. M., Huentemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. Leon, Linares, E. C., Linnemann, J. T., Longo, M., Luna-Garcia, R., Marinelli, A., Martinez, H., Martinez, O., Martinez-Castro, J., Matthews, J. A. J., McEnery, J., Torres, E. Mendoza, Miranda-Romagnoli, P., Moreno, E., Mostafa, M., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Perez-Perez, E. G., Pretz, J., Riviere, C., Rosa-Gonzalez, D., Ryan, J., Salazar, H., Salesa, F., Sandoval, A., Schneider, M., Silich, S., Sinnis, G., Smith, A. J., Woodle, K. Sparks, Springer, R. W., Taboada, I., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Villasenor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., Zhou, H., and Abazajian, K. N.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology
Abstract: The High Altitude Water Cherenkov (HAWC) observatory is a wide field-of-view detector sensitive to gamma rays of 100 GeV to a few hundred TeV. Located in central Mexico at 19 degrees North latitude and 4100 m above sea level, HAWC will observe gamma rays and cosmic rays with an array of water Cherenkov detectors. The full HAWC array is scheduled to be operational in Spring 2015. In this paper, we study the HAWC sensitivity to the gamma-ray signatures of high-mass (multi- TeV) dark matter annihilation. The HAWC observatory will be sensitive to diverse searches for dark matter annihilation, including annihilation from extended dark matter sources, the diffuse gamma-ray emission from dark matter annihilation, and gamma-ray emission from non-luminous dark matter subhalos. Here we consider the HAWC sensitivity to a subset of these sources, including dwarf galaxies, the M31 galaxy, the Virgo cluster, and the Galactic center. We simulate the HAWC response to gamma rays from these sources in several well-motivated dark matter annihilation channels. If no gamma-ray excess is observed, we show the limits HAWC can place on the dark matter cross-section from these sources. In particular, in the case of dark matter annihilation into gauge bosons, HAWC will be able to detect a narrow range of dark matter masses to cross-sections below thermal. HAWC should also be sensitive to non-thermal cross-sections for masses up to nearly 1000 TeV. The constraints placed by HAWC on the dark matter cross-section from known sources should be competitive with current limits in the mass range where HAWC has similar sensitivity. HAWC can additionally explore higher dark matter masses than are currently constrained., Comment: 15 pages, 4 figures, version to be published in PRD
Published: 2014
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78. The HAWC Gamma-Ray Observatory: Observations of Cosmic Rays

Author: HAWC Collaboration, Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Belmont, E., BenZvi, S. Y., Berley, D., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Caballero-Mora, K. S., Carramiñana, A., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Fernandez, A., Fiorino, D. W., Fraija, N., Galindo, A., Garfias, F., González, L. X., González, M. M., Goodman, J. A., Grabski, V., Gussert, M., Hampel-Arias, Z., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linares, E. C., Linnemann, J. T., Longo, M., Luna-GarcIa, R., Marinelli, A., Martinez, H., Martinez, O., Martínez-Castro, J., Matthews, J. A. J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nava, J., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Rivière, C., Rosa-González, D., Salazar, H., Salesa, F., Sanchez, F. E., Sandoval, A., Santos, E., Schneider, M., Silich, S., Sinnis, G., Smith, A. J., Sparks, K., Springer, R. W., Taboada, I., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We describe measurements of GeV and TeV cosmic rays with the High-Altitude Water Cherenkov Gamma-Ray Observatory, or HAWC. The measurements include the observation of the shadow of the moon; the observation of small-scale and large-scale angular clustering of the TeV cosmic rays; the prospects for measurement of transient solar events with HAWC; and the observation of Forbush decreases with the HAWC engineering array and HAWC-30., Comment: Contributions to the 33rd International Cosmic Ray Conference, Rio de Janeiro, Brazil, July 2013
Published: 2013

79. The HAWC Gamma-Ray Observatory: Dark Matter, Cosmology, and Fundamental Physics

Author: HAWC Collaboration, Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Belmont, E., BenZvi, S. Y., Berley, D., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Caballero-Mora, K. S., Carramiñana, A., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Fernandez, A., Fiorino, D. W., Fraija, N., Galindo, A., Garfias, F., González, L. X., González, M. M., Goodman, J. A., Grabski, V., Gussert, M., Hampel-Arias, Z., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linares, E. C., Linnemann, J. T., Longo, M., Luna-GarcIa, R., Marinelli, A., Martinez, H., Martinez, O., Martínez-Castro, J., Matthews, J. A. J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nava, J., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Rivière, C., Rosa-González, D., Salazar, H., Salesa, F., Sanchez, F. E., Sandoval, A., Santos, E., Schneider, M., Silich, S., Sinnis, G., Smith, A. J., Sparks, K., Springer, R. W., Taboada, I., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The High-Altitude Water Cherenkov Gamma Ray Observatory (HAWC) is designed to perform a synoptic survey of the TeV sky. The high energy coverage of the experiment will enable studies of fundamental physics beyond the Standard Model, and the large field of view of the detector will enable detailed studies of cosmologically significant backgrounds and magnetic fields. We describe the sensitivity of the full HAWC array to these phenomena in five contributions shown at the 33rd International Cosmic Ray Conference in Rio de Janeiro, Brazil (July 2013)., Comment: Contributions to the 33rd International Cosmic Ray Conference, Rio de Janeiro, Brazil, July 2013
Published: 2013

80. The HAWC Gamma-Ray Observatory: Design, Calibration, and Operation

Author: HAWC Collaboration, Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Belmont, E., BenZvi, S. Y., Berley, D., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Caballero-Mora, K. S., Carramiñana, A., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Fernandez, A., Fiorino, D. W., Fraija, N., Galindo, A., Garfias, F., González, L. X., González, M. M., Goodman, J. A., Grabski, V., Gussert, M., Hampel-Arias, Z., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linares, E. C., Linnemann, J. T., Longo, M., Luna-GarcIa, R., Marinelli, A., Martinez, H., Martinez, O., Martínez-Castro, J., Matthews, J. A. J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nava, J., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Rivière, C., Rosa-González, D., Salazar, H., Salesa, F., Sanchez, F. E., Sandoval, A., Santos, E., Schneider, M., Silich, S., Sinnis, G., Smith, A. J., Sparks, K., Springer, R. W., Taboada, I., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract: The High-Altitude Water Cherenkov Gamma Ray Observatory (HAWC) is under construction 4100 meters above sea level at Sierra Negra, Mexico. We describe the design and cabling of the detector, the characterization of the photomultipliers, and the timing calibration system. We also outline a next-generation detector based on the water Cherenkov technique., Comment: Contributions to the 33rd International Cosmic Ray Conference, Rio de Janeiro, Brazil, July 2013
Published: 2013

81. The HAWC Gamma-Ray Observatory: Sensitivity to Steady and Transient Sources of Gamma Rays

Author: HAWC Collaboration, Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Belmont, E., BenZvi, S. Y., Berley, D., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Caballero-Mora, K. S., Carramiñana, A., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Díaz-Vélez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Fernandez, A., Fiorino, D. W., Fraija, N., Galindo, A., Garfias, F., González, L. X., González, M. M., Goodman, J. A., Grabski, V., Gussert, M., Hampel-Arias, Z., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linares, E. C., Linnemann, J. T., Longo, M., Luna-GarcIa, R., Marinelli, A., Martinez, H., Martinez, O., Martínez-Castro, J., Matthews, J. A. J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nava, J., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Rivière, C., Rosa-González, D., Salazar, H., Salesa, F., Sanchez, F. E., Sandoval, A., Santos, E., Schneider, M., Silich, S., Sinnis, G., Smith, A. J., Sparks, K., Springer, R. W., Taboada, I., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory is designed to record air showers produced by cosmic rays and gamma rays between 100 GeV and 100 TeV. Because of its large field of view and high livetime, HAWC is well-suited to measure gamma rays from extended sources, diffuse emission, and transient sources. We describe the sensitivity of HAWC to emission from the extended Cygnus region as well as other types of galactic diffuse emission; searches for flares from gamma-ray bursts and active galactic nuclei; and the first measurement of the Crab Nebula with HAWC-30., Comment: Contributions to the 33rd International Cosmic Ray Conference, Rio de Janeiro, Brazil, July 2013
Published: 2013

82. Sensitivity of the High Altitude Water Cherenkov Detector to Sources of Multi-TeV Gamma Rays

Author: Abeysekara, A. U., Alfaro, R., Alvarez, C., Álvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Solares, H. A. Ayala, Barber, A. S., Baughman, B. M., Bautista-Elivar, N., Belmont, E., BenZvi, S. Y., Berley, D., Rosales, M. Bonilla, Braun, J., Caballero-Lopez, R. A., Carramiñana, A., Castillo, M., Cotti, U., Cotzomi, J., de la Fuente, E., De León, C., DeYoung, T., Hernandez, R. Diaz, Diaz-Velez, J. C., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Fernandez, A., Fiorino, D. W., Fraija, N., Galindo, A., Garcia-Luna, J. L., Garcia-Torales, G., Garfias, F., González, L. X., González, M. M., Goodman, J. A., Grabski, V., Gussert, M., Hampel-Arias, Z., Hui, C. M., Hüntemeyer, P., Imran, A., Iriarte, A., Karn, P., Kieda, D., Kunde, G. J., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Vargas, H. León, Linares, E. C., Linnemann, J. T., Longo, M., Luna-García, R., Marinelli, A., Martinez, O., Martínez-Castro, J., Matthews, J. A. J., Miranda-Romagnoli, P., Moreno, E., Mostafá, M., Nava, J., Nellen, L., Newbold, M., Noriega-Papaqui, R., Oceguera-Becerra, T., Patricelli, B., Pelayo, R., Pérez-Pérez, E. G., Pretz, J., Rivière, C., Rosa-González, D., Salazar, H., Salesa, F., Sandoval, A., Santos, E., Schneider, M., Silich, S., Sinnis, G., Smith, A. J., Sparks, K., Springer, R. W., Taboada, I., Toale, P. A., Tollefson, K., Torres, I., Ukwatta, T. N., Villaseñor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yodh, G. B., Younk, P. W., Zaborov, D., Zepeda, A., and Zhou, H.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The High Altitude Water Cherenkov (HAWC) observatory is an array of large water Cherenkov detectors sensitive to gamma rays and hadronic cosmic rays in the energy band between 100 GeV and 100 TeV. The observatory will be used to measure high-energy protons and cosmic rays via detection of the energetic secondary particles reaching the ground when one of these particles interacts in the atmosphere above the detector. HAWC is under construction at a site 4100 meters above sea level on the northern slope of the volcano Sierra Negra, which is located in central Mexico at 19 degrees N latitude. It is scheduled for completion in 2014. In this paper we estimate the sensitivity of the HAWC instrument to point-like and extended sources of gamma rays. The source fluxes are modeled using both unbroken power laws and power laws with exponential cutoffs. HAWC, in one year, is sensitive to point sources with integral power-law spectra as low as 5x10^-13 cm^-2 sec^-1 above 2 TeV (approximately 50 mCrab) over 5 sr of the sky. This is a conservative estimate based on simple event parameters and is expected to improve as the data analysis techniques are refined. We discuss known TeV sources and the scientific contributions that HAWC can make to our understanding of particle acceleration in these sources.
Published: 2013
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83. HAWC Study of the Very-high-energy γ-Ray Spectrum of HAWC J1844−034

Author: Albert, A., primary, Alvarez, C., additional, Rojas, D. Avila, additional, Solares, H. A. Ayala, additional, Babu, R., additional, Belmont-Moreno, E., additional, Breuhaus, M., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Cotzomi, J., additional, de León, S. Coutiño, additional, De la Fuente, E., additional, Depaoli, D., additional, Diaz Hernandez, R., additional, Dingus, B. L., additional, DuVernois, M. A., additional, Durocher, M., additional, Engel, K., additional, Espinoza, C., additional, Fan, K. L., additional, Fang, K., additional, Fraija, N., additional, García-González, J. A., additional, González, M. M., additional, Goodman, J. A., additional, Groetsch, S., additional, Harding, J. P., additional, Herzog, I., additional, Hinton, J., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Humensky, T. B., additional, Hüntemeyer, P., additional, Joshi, V., additional, Kaufmann, S., additional, Lee, J., additional, Vargas, H. León, additional, Longinotti, A. L., additional, Luis-Raya, G., additional, Malone, K., additional, Martinez, O., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Miranda-Romagnoli, P., additional, Morales-Soto, J. A., additional, Moreno, E., additional, Mostafá, M., additional, Nellen, L., additional, Noriega-Papaqui, R., additional, Olivera-Nieto, L., additional, Omodei, N., additional, Pérez-Pérez, E. G., additional, Rho, C. D., additional, Rosa-González, D., additional, Ruiz-Velasco, E., additional, Salazar, H., additional, Salazar-Gallegos, D., additional, Sandoval, A., additional, Schneider, M., additional, Serna-Franco, J., additional, Smith, A. J., additional, Son, Y., additional, Springer, R. W., additional, Tibolla, O., additional, Tollefson, K., additional, Torres, I., additional, Torres-Escobedo, R., additional, Turner, R., additional, Ureña-Mena, F., additional, Varela, E., additional, Villaseñor, L., additional, Wang, X., additional, Watson, I. J., additional, Willox, E., additional, and Zhou, H., additional
Published: 2023
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84. Author Correction: HAWC observations of the acceleration of very-high-energy cosmic rays in the Cygnus Cocoon

Author: Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Camacho, J. R. Angeles, Arteaga-Velázquez, J. C., Arunbabu, K. P., Rojas, D. Avila, Solares, H. A. Ayala, Baghmanyan, V., Belmont-Moreno, E., BenZvi, S. Y., Blandford, R., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Cotti, U., de León, S. Coutiño, De la Fuente, E., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Durocher, M., Díaz-Vélez, J. C., Ellsworth, R. W., Engel, K., Espinoza, C., Fan, K. L., Fang, K., Fleischhack, H., Fraija, N., Galván-Gámez, A., Garcia, D., García-González, J. A., Garfias, F., Giacinti, G., González, M. M., Goodman, J. A., Harding, J. P., Hernandez, S., Hinton, J., Hona, B., Huang, D., Hueyotl-Zahuantitla, F., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kieda, D., Lara, A., Lee, W. H., Vargas, H. León, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Lundeen, J., Malone, K., Martinez, O., Martinez-Castellanos, I., Martínez-Castro, J., Matthews, J. A., Miranda-Romagnoli, P., Morales-Soto, J. A., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Olivera-Nieto, L., Omodei, N., Peisker, A., Araujo, Y. Pérez, Pérez-Pérez, E. G., Ren, Z., Rho, C. D., Rosa-González, D., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Serna, F., Smith, A. J., Springer, R. W., Surajbali, P., Tollefson, K., Torres, I., Torres-Escobedo, R., Ureña-Mena, F., Weisgarber, T., Werner, F., Willox, E., Zepeda, A., Zhou, H., De León, C., and Álvarez, J. D.
Published: 2021
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85. Searching for TeV Dark Matter in Irregular Dwarf Galaxies with HAWC Observatory

Author: Alfaro, R., primary, Alvarez, C., additional, Arteaga-Velázquez, J. C., additional, Rojas, D. Avila, additional, Solares, H. A. Ayala, additional, Babu, R., additional, Belmont-Moreno, E., additional, Caballero-Mora, K. S., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Chaparro-Amaro, O., additional, Cotti, U., additional, Cotzomi, J., additional, De la Fuente, E., additional, Diaz Hernandez, R., additional, Dingus, B. L., additional, DuVernois, M. A., additional, Durocher, M., additional, Díaz-Vélez, J. C., additional, Espinoza, C., additional, Fan, K. L., additional, Fraija, N., additional, García-González, J. A., additional, Garfias, F., additional, González, M. M., additional, Harding, J. P., additional, Hernández-Cadena, S., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Iriarte, A., additional, Joshi, V., additional, Kaufmann, S., additional, Kieda, D., additional, Lee, J., additional, Vargas, H. León, additional, Linnemann, J. T., additional, Longinotti, A. L., additional, Luis-Raya, G., additional, Malone, K., additional, Martinez, O., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Moreno, E., additional, Mostafá, M., additional, Nayerhoda, A., additional, Nellen, L., additional, Omodei, N., additional, Araujo, Y. Pérez, additional, Pérez-Pérez, E. G., additional, Rho, C. D., additional, Rosa-González, D., additional, Salazar, H., additional, Salazar-Gallegos, D., additional, Sandoval, A., additional, Serna-Franco, J., additional, Son, Y., additional, Springer, R. W., additional, Tibolla, O., additional, Tollefson, K., additional, Torres, I., additional, Torres-Escobedo, R., additional, Turner, R., additional, Ureña-Mena, F., additional, Villaseñor, L., additional, Wang, X., additional, Willox, E., additional, Zhou, H., additional, de León, C., additional, Gammaldi, V., additional, Karukes, E., additional, and Salucci, P., additional
Published: 2023
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86. Search for Gamma-Ray and Neutrino Coincidences Using HAWC and ANTARES Data

Author: Solares, H. A. Ayala, primary, Coutu, S., additional, Cowen, D., additional, Fox, D. B., additional, Grégoire, T., additional, McBride, F., additional, Mostafá, M., additional, Murase, K., additional, Wissel, S., additional, Albert, A., additional, Alves, S., additional, André, M., additional, Ardid, M., additional, Ardid, S., additional, Aubert, J.-J., additional, Aublin, J., additional, Baret, B., additional, Basa, S., additional, Belhorma, B., additional, Bendahman, M., additional, Benfenati, F., additional, Bertin, V., additional, Biagi, S., additional, Bissinger, M., additional, Boumaaza, J., additional, Bouta, M., additional, Bouwhuis, M. C., additional, Brânzaş, H., additional, Bruijn, R., additional, Brunner, J., additional, Busto, J., additional, Caiffi, B., additional, Calvo, D., additional, Capone, A., additional, Caramete, L., additional, Carr, J., additional, Carretero, V., additional, Celli, S., additional, Chabab, M., additional, Chau, T. N., additional, El Moursli, R. Cherkaoui, additional, Chiarusi, T., additional, Circella, M., additional, Coelho, J. A. B., additional, Coleiro, A., additional, Coniglione, R., additional, Coyle, P., additional, Creusot, A., additional, Díaz, A. F., additional, de Wasseige, G., additional, De Martino, B., additional, Distefano, C., additional, Di Palma, I., additional, Domi, A., additional, Donzaud, C., additional, Dornic, D., additional, Drouhin, D., additional, Eberl, T., additional, van Eeden, T., additional, van Eijk, D., additional, El Khayati, N., additional, Enzenhöfer, A., additional, Fermani, P., additional, Ferrara, G., additional, Filippini, F., additional, Fusco, L., additional, García, J., additional, Gay, P., additional, Glotin, H., additional, Gozzini, R., additional, Ruiz, R. Gracia, additional, Graf, K., additional, Guidi, C., additional, Hallmann, S., additional, van Haren, H., additional, Heijboer, A. J., additional, Hello, Y., additional, Hernández-Rey, J. J., additional, Hößl, J., additional, Hofestädt, J., additional, Huang, F., additional, Illuminati, G., additional, James, C. W., additional, Jisse-Jung, B., additional, de Jong, M., additional, de Jong, P., additional, Kadler, M., additional, Kalekin, O., additional, Katz, U., additional, Kouchner, A., additional, Kreykenbohm, I., additional, Kulikovskiy, V., additional, Lahmann, R., additional, Lamoureux, M., additional, Le Breton, R., additional, Lefèvre, D., additional, Leonora, E., additional, Levi, G., additional, Le Stum, S., additional, Lopez-Coto, D., additional, Loucatos, S., additional, Maderer, L., additional, Manczak, J., additional, Marcelin, M., additional, Margiotta, A., additional, Marinelli, A., additional, Martínez-Mora, J. A., additional, Melis, K., additional, Migliozzi, P., additional, Moussa, A., additional, Muller, R., additional, Nauta, L., additional, Navas, S., additional, Nezri, E., additional, Fearraigh, B. Ó, additional, Păun, A., additional, Păvălaş, G. E., additional, Pellegrino, C., additional, Perrin-Terrin, M., additional, Pestel, V., additional, Piattelli, P., additional, Pieterse, C., additional, Poirè, C., additional, Popa, V., additional, Pradier, T., additional, Randazzo, N., additional, Real, D., additional, Reck, S., additional, Riccobene, G., additional, Romanov, A., additional, Sánchez-Losa, A., additional, Samtleben, D. F. E., additional, Sanguineti, M., additional, Sapienza, P., additional, Schnabel, J., additional, Schumann, J., additional, Schüssler, F., additional, Seneca, J., additional, Spurio, M., additional, Stolarczyk, Th., additional, Taiuti, M., additional, Tayalati, Y., additional, Tingay, S. J., additional, Vallage, B., additional, Van Elewyck, V., additional, Versari, F., additional, Viola, S., additional, Vivolo, D., additional, Wilms, J., additional, Zavatarelli, S., additional, Zegarelli, A., additional, Zornoza, J. D., additional, Zúñiga, J., additional, Alvarez, C., additional, Arteaga-Velázquez, J. C., additional, Babu, R., additional, Belmont-Moreno, E., additional, Caballero-Mora, K. S., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Cotti, U., additional, Chaparro-Amaro, O., additional, Cotzomi, J., additional, de León, S. Coutiño, additional, De la Fuente, E., additional, de León, C., additional, Diaz Hernandez, R., additional, DuVernois, M. A., additional, Durocher, M., additional, Díaz-Vélez, J. C., additional, Engel, K., additional, Espinoza, C., additional, Fan, K. L., additional, Alonso, M. Fernández, additional, Fraija, N., additional, García-González, J. A., additional, Garfias, F., additional, González, M. M., additional, Goodman, J. A., additional, Harding, J. P., additional, Hernandez, S., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Hüntemeyer, P., additional, Iriarte, A., additional, Joshi, V., additional, Kaufmann, S., additional, Lara, A., additional, Vargas, H. León, additional, Linnemann, J. T., additional, Longinotti, A. L., additional, Luis-Raya, G., additional, Malone, K., additional, Martinez, O., additional, Martinez-Castellanos, I., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Miranda-Romagnoli, P., additional, Morales-Soto, J. A., additional, Moreno, E., additional, Nayerhoda, A., additional, Nellen, L., additional, Nisa, M. U., additional, Noriega-Papaqui, R., additional, Omodei, N., additional, Peisker, A., additional, Araujo, Y. Pérez, additional, Pérez-Pérez, E. G., additional, Rho, C. D., additional, Rosa-González, D., additional, Ruiz-Velasco, E., additional, Salazar, H., additional, Salesa Greus, F., additional, Sandoval, A., additional, Schneider, M., additional, Smith, A. J., additional, Son, Y., additional, Springer, R. W., additional, Tibolla, O., additional, Tollefson, K., additional, Torres, I., additional, Torres-Escobedo, R., additional, Turner, R., additional, Ureña-Mena, F., additional, Varela, E., additional, Wang, X., additional, Whitaker, K., additional, Willox, E., additional, Zepeda, A., additional, and Zhou, H., additional
Published: 2023
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87. Detailed Analysis of the TeV γ-Ray Sources 3HWC J1928+178, 3HWC J1930+188, and the New Source HAWC J1932+192

Author: Albert, A., primary, Alfaro, R., additional, Alvarez, C., additional, Arteaga-Velázquez, J. C., additional, Rojas, D. Avila, additional, Solares, H. A. Ayala, additional, Babu, R., additional, Belmont-Moreno, E., additional, Brisbois, C., additional, Caballero-Mora, K. S., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Chaparro-Amaro, O., additional, Cotti, U., additional, Cotzomi, J., additional, de León, S. Coutiño, additional, De la Fuente, E., additional, de León, C., additional, Hernandez, R. Diaz, additional, Díaz-Vélez, J. C., additional, Dingus, B. L., additional, DuVernois, M. A., additional, Durocher, M., additional, Engel, K., additional, Espinoza, C., additional, Fan, K. L., additional, Alonso, M. Fernández, additional, Fraija, N., additional, García-González, J. A., additional, Garfias, F., additional, Goksu, H., additional, González, M. M., additional, Goodman, J. A., additional, Harding, J. P., additional, Hernandez, S., additional, Hinton, J., additional, Hona, B., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Hüntemeyer, P., additional, Iriarte, A., additional, Jardin-Blicq, A., additional, Joshi, V., additional, Kaufmann, S., additional, Kieda, D., additional, Lee, W. H., additional, Vargas, H. León, additional, Linnemann, J. T., additional, Longinotti, A. L., additional, Luis-Raya, G., additional, López-Coto, R., additional, Malone, K., additional, Marandon, V., additional, Martinez, O., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Miranda-Romagnoli, P., additional, Morales-Soto, J. A., additional, Moreno, E., additional, Mostafá, M., additional, Nayerhoda, A., additional, Nellen, L., additional, Newbold, M., additional, Nisa, M. U., additional, Noriega-Papaqui, R., additional, Olivera-Nieto, L., additional, Omodei, N., additional, Peisker, A., additional, Araujo, Y. Pérez, additional, Pérez-Pérez, E. G., additional, Rho, C. D., additional, Rosa-González, D., additional, Ruiz-Velasco, E., additional, Salazar, H., additional, Salazar-Gallegos, D., additional, Greus, F. Salesa, additional, Sandoval, A., additional, Schneider, M., additional, Serna-Franco, J., additional, Smith, A. J., additional, Son, Y., additional, Springer, R. W., additional, Tibolla, O., additional, Tollefson, K., additional, Torres, I., additional, Torres-Escobedo, R., additional, Turner, R., additional, Ureña-Mena, F., additional, Villaseñor, L., additional, Wang, X., additional, Werner, F., additional, Willox, E., additional, and Zhou, H., additional
Published: 2023
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88. γ-Ray Emission from Classical Nova V392 Per: Measurements from Fermi and HAWC

Author: Albert, A., primary, Alfaro, R., additional, Alvarez, C., additional, Arteaga-Velázquez, J. C., additional, Rojas, D. Avila, additional, Solares, H. A. Ayala, additional, Babu, R., additional, Belmont-Moreno, E., additional, Blochwitz, C., additional, Caballero-Mora, K. S., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Chaparro-Amaro, O., additional, Cotti, U., additional, Cotzomi, J., additional, De la Fuente, E., additional, de León, C., additional, de León, S. Coutiño, additional, Diaz Hernandez, R., additional, Dingus, B. L., additional, DuVernois, M. A., additional, Durocher, M., additional, Díaz-Vélez, J. C., additional, Engel, K., additional, Espinoza, C., additional, Fan, K. L., additional, Fang, K., additional, Fraija, N., additional, García-González, J. A., additional, Garfias, F., additional, González, M. M., additional, Goodman, J. A., additional, Harding, J. P., additional, Hernandez, S., additional, Hinton, J., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Hüntemeyer, P., additional, Iriarte, A., additional, Joshi, V., additional, Lara, A., additional, Lee, W. H., additional, Linnemann, J. T., additional, Longinotti, A. L., additional, Luis-Raya, G., additional, Lundeen, J., additional, Malone, K., additional, Marandon, V., additional, Martinez, O., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Miranda-Romagnoli, P., additional, Morales-Soto, J. A., additional, Moreno, E., additional, Mostafá, M., additional, Nayerhoda, A., additional, Nellen, L., additional, Newbold, M., additional, Nisa, M. U., additional, Noriega-Papaqui, R., additional, Omodei, N., additional, Peisker, A., additional, Araujo, Y. Pérez, additional, Pérez-Pérez, E. G., additional, Rho, C. D., additional, Rosa-González, D., additional, Ruiz-Velasco, E., additional, Salazar-Gallegos, D., additional, Greus, F. Salesa, additional, Sandoval, A., additional, Serna-Franco, J., additional, Smith, A. J., additional, Son, Y., additional, Springer, R. W., additional, Tibolla, O., additional, Tollefson, K., additional, Torres, I., additional, Torres-Escobedo, R., additional, Turner, R., additional, Ureña-Mena, F., additional, Villaseñor, L., additional, Wang, X., additional, Willox, E., additional, Zepeda, A., additional, Zhou, H., additional, Chomiuk, L., additional, Aydi, E., additional, Li, K. L., additional, Metzger, B. D., additional, and Vurm, I., additional
Published: 2022
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89. Constraints on the Very High Energy Gamma-Ray Emission from Short GRBs with HAWC

Author: Albert, A., primary, Alfaro, R., additional, Alvarez, C., additional, Arteaga-Velázquez, J. C., additional, Arunbabu, K. P., additional, Rojas, D. Avila, additional, Solares, H. A. Ayala, additional, Babu, R., additional, Belmont-Moreno, E., additional, Brisbois, C., additional, Caballero-Mora, K. S., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Chaparro-Amaro, O., additional, Cotti, U., additional, Cotzomi, J., additional, de León, S. Coutiño, additional, León, C. de, additional, De la Fuente, E., additional, Hernandez, R. Diaz, additional, Dichiara, S., additional, Dingus, B. L., additional, DuVernois, M. A., additional, Durocher, M., additional, Díaz-Vélez, J. C., additional, Engel, K., additional, Espinoza, C., additional, Fan, K. L., additional, Fraija, N., additional, Galván-Gámez, A., additional, García-González, J. A., additional, Garfias, F., additional, González, M. M., additional, Goodman, J. A., additional, Harding, J. P., additional, Hernandez, S., additional, Hona, B., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Humensky, T. B., additional, Hüntemeyer, P., additional, Iriarte, A., additional, Joshi, V., additional, Kaufmann, S., additional, Lara, A., additional, Lee, W. H., additional, Vargas, H. León, additional, Linnemann, J. T., additional, Longinotti, A. L., additional, Luis-Raya, G., additional, Malone, K., additional, Marinelli, S. S., additional, Martinez, O., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Miranda-Romagnoli, P., additional, Morales-Soto, J. A., additional, Moreno, E., additional, Mostafá, M., additional, Nayerhoda, A., additional, Nellen, L., additional, Newbold, M., additional, Noriega-Papaqui, R., additional, Peisker, A., additional, Araujo, Y. Pérez, additional, Pérez-Pérez, E. G., additional, Ren, Z., additional, Rho, C. D., additional, Rosa-González, D., additional, Rosenberg, M., additional, Sacahui, J. R., additional, Salazar, H., additional, Greus, F. Salesa, additional, Sandoval, A., additional, Serna-Franco, J., additional, Smith, A. J., additional, Springer, R. W., additional, Surajbali, P., additional, Tibolla, O., additional, Tollefson, K., additional, Torres, I., additional, Torres-Escobedo, R., additional, Turner, R., additional, Villaseñor, L., additional, Wang, X., additional, Willox, E., additional, Zepeda, A., additional, and Zhou, H., additional
Published: 2022
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90. Probing the Extragalactic Mid-infrared Background with HAWC

Author: Albert, A., primary, Alfaro, R., additional, Alvarez, C., additional, Arteaga-Velázquez, J. C., additional, Rojas, D. Avila, additional, Solares, H. A. Ayala, additional, Babu, R., additional, Belmont-Moreno, E., additional, Caballero-Mora, K. S., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Chaparro-Amaro, O., additional, Cotti, U., additional, Cotzomi, J., additional, de León, S. Coutiño, additional, De la Fuente, E., additional, Hernandez, R. Diaz, additional, DuVernois, M. A., additional, Durocher, M., additional, Díaz-Vélez, J. C., additional, Engel, K., additional, Espinoza, C., additional, Fan, K. L., additional, Alonso, M. Fernández, additional, Fraija, N., additional, García-González, J. A., additional, Garfias, F., additional, González, M. M., additional, Goodman, J. A., additional, Harding, J. P., additional, Hernandez, S., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Hntemeyer, P., additional, Iriarte, A., additional, Jardin-Blicq, A., additional, Joshi, V., additional, Kieda, D., additional, Lee, W. H., additional, Linnemann, J. T., additional, Longinotti, A. L., additional, Luis-Raya, G., additional, Malone, K., additional, Martinez, O., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Miranda-Romagnoli, P., additional, Moreno, E., additional, Mostafá, M., additional, Nayerhoda, A., additional, Nellen, L., additional, Newbold, M., additional, Nisa, M. U., additional, Noriega-Papaqui, R., additional, Omodei, N., additional, Peisker, A., additional, Araujo, Y. Pérez, additional, Pérez-Pérez, E. G., additional, Rho, C. D., additional, Rosa-González, D., additional, Salazar, H., additional, Salazar-Gallegos, D., additional, Greus, F. Salesa, additional, Sandoval, A., additional, Serna-Franco, J., additional, Smith, A. J., additional, Son, Y., additional, Springer, R. W., additional, Tibolla, O., additional, Tollefson, K., additional, Torres, I., additional, Torres-Escobedo, R., additional, Turner, R., additional, Ureña-Mena, F., additional, Villaseñor, L., additional, Wang, X., additional, Weisgarber, T., additional, Willox, E., additional, Zhou, H., additional, and de León, C., additional
Published: 2022
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91. Long-term Spectra of the Blazars Mrk 421 and Mrk 501 at TeV Energies Seen by HAWC

Author: Albert, A., primary, Alfaro, R., additional, Alvarez, C., additional, Camacho, J. R. Angeles, additional, Arteaga-Velázquez, J. C., additional, Arunbabu, K. P., additional, Rojas, D. Avila, additional, Solares, H. A. Ayala, additional, Baghmanyan, V., additional, Belmont-Moreno, E., additional, Caballero-Mora, K. S., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Cotti, U., additional, Cotzomi, J., additional, de León, S. Coutiño, additional, De la Fuente, E., additional, Hernandez, R. Diaz, additional, DuVernois, M. A., additional, Durocher, M., additional, Díaz-Vélez, J. C., additional, Engel, K., additional, Espinoza, C., additional, Fan, K. L., additional, Alonso, M. Fernández, additional, Fraija, N., additional, Garcia, D., additional, García-González, J. A., additional, Garfias, F., additional, González, M. M., additional, Goodman, J. A., additional, Harding, J. P., additional, Hona, B., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Hüntemeyer, P., additional, Iriarte, A., additional, Joshi, V., additional, Lara, A., additional, Lee, W. H., additional, Lee, J., additional, Vargas, H. León, additional, Linneman, J. T., additional, Longinotti, A. L., additional, Luis-Raya, G., additional, Malone, K., additional, Martinez, O., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Miranda-Romagnoli, P., additional, Moreno, E., additional, Mostafá, M., additional, Nayerhoda, A., additional, Nellen, L., additional, Newbold, M., additional, Noriega-Papaqui, R., additional, Peisker, A., additional, Araujo, Y. Pérez, additional, Pérez-Pérez, E. G., additional, Rho, C. D., additional, Rosa-González, D., additional, Salazar, H., additional, Greus, F. Salesa, additional, Sandoval, A., additional, Schneider, M., additional, Serna-Franco, J., additional, Smith, A. J., additional, Springer, R. W., additional, Tollefson, K., additional, Torres, I., additional, Torres-Escobedo, R., additional, Ureña-Mena, F., additional, Villaseñor, L., additional, Wang, X., additional, Weisgarber, T., additional, Willox, E., additional, Zhou, H., additional, and de León, C., additional
Published: 2022
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92. HAWC Study of the Ultra-high-energy Spectrum of MGRO J1908+06

Author: Albert, A., primary, Alfaro, R., additional, Alvarez, C., additional, Álvarez, J. D., additional, Camacho, J. R. Angeles, additional, Arteaga-Velázquez, J. C., additional, Rojas, D. Avila, additional, Solares, H. A. Ayala, additional, Babu, R., additional, Belmont-Moreno, E., additional, Brisbois, C., additional, Caballero-Mora, K. S., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Cotti, U., additional, Cotzomi, J., additional, de León, S. Coutiño, additional, Fuente, E. De la, additional, León, C. de, additional, Hernandez, R. Diaz, additional, Dingus, B. L., additional, DuVernois, M. A., additional, Durocher, M., additional, Díaz-Vélez, J. C., additional, Engel, K., additional, Espinoza, C., additional, Fan, K. L., additional, Fang, K., additional, Alonso, M. Fernández, additional, Fraija, N., additional, Garcia, D., additional, García-González, J. A., additional, Garfias, F., additional, Giacinti, G., additional, Goksu, H., additional, González, M. M., additional, Goodman, J. A., additional, Harding, J. P., additional, Hinton, J., additional, Hona, B., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Hüntemeyer, P., additional, Iriarte, A., additional, Jardin-Blicq, A., additional, Joshi, V., additional, Kaufmann, S., additional, Kieda, D., additional, Lee, W. H., additional, Lee, J., additional, Vargas, H. León, additional, Linnemann, J. T., additional, Longinotti, A. L., additional, Luis-Raya, G., additional, Malone, K., additional, Marandon, V., additional, Martinez, O., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Miranda-Romagnoli, P., additional, Morales-Soto, J. A., additional, Moreno, E., additional, Mostafá, M., additional, Nayerhoda, A., additional, Nellen, L., additional, Newbold, M., additional, Nisa, M. U., additional, Noriega-Papaqui, R., additional, Olivera-Nieto, L., additional, Omodei, N., additional, Peisker, A., additional, Araujo, Y. Pérez, additional, Pérez-Pérez, E. G., additional, Rho, C. D., additional, Rosa-González, D., additional, Salazar, H., additional, Greus, F. Salesa, additional, Sandoval, A., additional, Schneider, M., additional, Schoorlemmer, H., additional, Serna-Franco, J., additional, Smith, A. J., additional, Son, Y., additional, Springer, R. W., additional, Tibolla, O., additional, Tollefson, K., additional, Torres, I., additional, Torres-Escobedo, R., additional, Turner, R., additional, Ureña-Mena, F., additional, Villaseñor, L., additional, Wang, X., additional, Watson, I. J., additional, Willox, E., additional, Zepeda, A., additional, Zhou, H., additional, Breuhaus, M., additional, Li, H., additional, and Zhang, H., additional
Published: 2022
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93. Multimessenger gamma-ray and neutrino coincidence alerts using hawc and icecube subthreshold data

Author: Solares, H. A. Ayala, Coutu, S., DeLaunay, J. J., Fox, D. B., Gr��goire, T., Keivani, A., Krau��, F., Mostaf��, M., Murase, K., Turley, C. F., Albert, A., Alfaro, R., Alvarez, C., Camacho, J. R. Angeles, Arteaga-Vel��zquez, J. C., Arunbabu, K. P., Rojas, D. Avila, Belmont-Moreno, E., Brisbois, C., Caballero-Mora, K. S., Carrami��ana, A., Casanova, S., Cotti, U., De la Fuente, E., Hernandez, R. Diaz, Dingus, B. L., DuVernois, M. A., Durocher, M., D��az-V��lez, J. C., Espinoza, C., Fan, K. L., Fleischhack, H., Fraija, N., Galv��n-G��mez, A., Garcia, D., Garc��a-Gonz��lez, J. A., Garfias, F., Gonz��lez, M. M., Goodman, J. A., Harding, J. P., Hona, B., Huang, D., Hueyotl-Zahuantitla, F., Huntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Vargas, H. Le��n, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Lundeen, J., Malone, K., Martinez, O., Martinez-Castellanos, I., Mart��nez-Castro, J., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Peisker, A., P��rez-P��rez, E. G., Rho, C. D., Rosa-Gonz��lez, D., Salazar, H., Greus, F. Salesa, Sandoval, A., Smith, A. J., Springer, R. W., Tollefson, K., Torres, I., Torres-Escobedo, R., Ure��a-Mena, F., Villase��or, L., Weisgarber, T., Willox, E., Zepeda, A., Zhou, H., de Le��n, C., Aartsen, M. G., Abbasi, R., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., Alispach, C., Amin, N. M., Andeen, K., Anderson, T., Ansseau, I., Anton, G., Arg��elles, C., Auffenberg, J., Axani, S., Bagherpour, H., Bai, X., V., A. Balagopal, Barbano, A., Barwick, S. W., Bastian, B., Basu, V., Baum, V., Baur, S., Bay, R., Beatty, J. J., Becker, K. -H., Tjus, J. Becker, BenZvi, S., Berley, D., Bernardini, E., Besson, D. Z., Binder, G., Bindig, D., Blaufuss, E., Blot, S., Bohm, C., B��ser, S., Botner, O., B��ttcher, J., Bourbeau, E., Bourbeau, J., Bradascio, F., Braun, J., Bron, S., Brostean-Kaiser, J., Burgman, A., Buscher, J., Busse, R. S., Carver, T., Chen, C., Cheung, E., Chirkin, D., Choi, S., Clark, B. A., Clark, K., Classen, L., Coleman, A., Collin, G. H., Conrad, J. M., Coppin, P., Correa, P., Cowen, D. F., Cross, R., Dave, P., De Clercq, C., Dembinski, H., Deoskar, K., De Ridder, S., Desai, A., Desiati, P., de Vries, K. D., de Wasseige, G., de With, M., DeYoung, T., Dharani, S., Diaz, A., Dujmovic, H., Dunkman, M., Dvorak, E., Ehrhardt, T., Eller, P., Engel, R., Evenson, P. A., Fahey, S., Fazely, A. R., Felde, J., Fienberg, A., Filimonov, K., Finley, C., Franckowiak, A., Friedman, E., Fritz, A., Gaisser, T. K., Gallagher, J., Ganster, E., Garrappa, S., Gerhardt, L., Glauch, T., Gl��senkamp, T., Goldschmidt, A., Gonzalez, J. G., Grant, D., Griffith, Z., Griswold, S., G��nder, M., G��nd��z, M., Haack, C., Hallgren, A., Halliday, R., Halve, L., Halzen, F., Hanson, K., Hardin, J., Haungs, A., Hauser, S., Hebecker, D., Heereman, D., Heix, P., Helbing, K., Hellauer, R., Henningsen, F., Hickford, S., Hignight, J., Hill, C., Hill, G. C., Hoffman, K. D., Hoffmann, R., Hoinka, T., Hokanson-Fasig, B., Hoshina, K., Huang, F., Huber, M., Huber, T., Hultqvist, K., H��nnefeld, M., Hussain, R., In, S., Iovine, N., Ishihara, A., Jansson, M., Japaridze, G. S., Jeong, M., Jones, B. J. P., Jonske, F., Joppe, R., Kang, D., Kang, W., Kappes, A., Kappesser, D., Karg, T., Karl, M., Karle, A., Katz, U., Kauer, M., Kellermann, M., Kelley, J. L., Kheirandish, A., Kim, J., Kin, K., Kintscher, T., Kiryluk, J., Kittler, T., Klein, S. R., Koirala, R., Kolanoski, H., K��pke, L., Kopper, C., Kopper, S., Koskinen, D. J., Koundal, P., Kowalski, M., Krings, K., Kr��ckl, G., Kulacz, N., Kurahashi, N., Kyriacou, A., Lanfranchi, J. L., Larson, M. J., Lauber, F., Lazar, J. P., Leonard, K., Leszczy��ska, A., Li, Y., Liu, Q. R., Lohfink, E., Mariscal, C. J. Lozano, Lu, L., Lucarelli, F., Ludwig, A., L��nemann, J., Luszczak, W., Lyu, Y., Ma, W. Y., Madsen, J., Maggi, G., Mahn, K. B. M., Makino, Y., Mallik, P., Mancina, S., Mari��, I. C., Maruyama, R., Mase, K., Maunu, R., McNally, F., Meagher, K., Medici, M., Medina, A., Meier, M., Meighen-Berger, S., Merz, J., Meures, T., Micallef, J., Mockler, D., Moment��, G., Montaruli, T., Moore, R. W., Morse, R., Moulai, M., Muth, P., Nagai, R., Naumann, U., Neer, G., Nguyen, L. V., Niederhausen, H., Nowicki, S. C., Nygren, D. R., Pollmann, A. Obertacke, Oehler, M., Olivas, A., O'Murchadha, A., O'Sullivan, E., Pandya, H., Pankova, D. V., Park, N., Parker, G. K., Paudel, E. N., Peiffer, P., Heros, C. P��rez de los, Philippen, S., Pieloth, D., Pieper, S., Pinat, E., Pizzuto, A., Plum, M., Popovych, Y., Porcelli, A., Rodriguez, M. Prado, Price, P. B., Przybylski, G. T., Raab, C., Raissi, A., Rameez, M., Rauch, L., Rawlins, K., Rea, I. C., Rehman, A., Reimann, R., Relethford, B., Renschler, M., Renzi, G., Resconi, E., Rhode, W., Richman, M., Riedel, B., Robertson, S., Roellinghoff, G., Rongen, M., Rott, C., Ruhe, T., Ryckbosch, D., Cantu, D. Rysewyk, Safa, I., Herrera, S. E. Sanchez, Sandrock, A., Sandroos, J., Santander, M., Sarkar, S., Satalecka, K., Scharf, M., Schaufel, M., Schieler, H., Schlunder, P., Schmidt, T., Schneider, A., Schneider, J., Schr��der, F. G., Schumacher, L., Sclafani, S., Seckel, D., Seunarine, S., Shefali, S., Silva, M., Smithers, B., Snihur, R., Soedingrekso, J., Soldin, D., Song, M., Spiczak, G. M., Spiering, C., Stachurska, J., Stamatikos, M., Stanev, T., Stein, R., Stettner, J., Steuer, A., Stezelberger, T., Stokstad, R. G., Strotjohann, N. L., St��rwald, T., Stuttard, T., Sullivan, G. W., Taboada, I., Tenholt, F., Ter-Antonyan, S., Terliuk, A., Tilav, S., Tomankova, L., T��nnis, C., Toscano, S., Tosi, D., Trettin, A., Tselengidou, M., Tung, C. F., Turcati, A., Turcotte, R., Ty, B., Unger, E., Elorrieta, M. A. Unland, Usner, M., Vandenbroucke, J., Van Driessche, W., van Eijk, D., van Eijndhoven, N., Vannerom, D., van Santen, J., Verpoest, S., Vraeghe, M., Walck, C., Wallace, A., Wallraff, M., Watson, T. B., Weaver, C., Weindl, A., Weiss, M. J., Weldert, J., Wendt, C., Werthebach, J., Whelan, B. J., Whitehorn, N., Wiebe, K., Wiebusch, C. H., Williams, D. R., Wills, L., Wolf, M., Wood, T. R., Woschnagg, K., Wrede, G., Wulff, J., Xu, X. W., Xu, Y., Yanez, J. P., Yoshida, S., Yuan, T., Zhang, Z., Z��cklein, M., Physics, Faculty of Sciences and Bioengineering Sciences, Vriendenkring VUB, and Elementary Particle Physics
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, astro-ph.HE, COSMIC cancer database, 010504 meteorology & atmospheric sciences, High-energy astronomy, Subthreshold conduction, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, 01 natural sciences, Coincidence, 3. Good health, Space and Planetary Science, Observatory, 0103 physical sciences, Physique des particules élémentaires, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences
Abstract: The High Altitude Water Cerenkov (HAWC) and IceCube observatories, through the Astrophysical Multimessenger Observatory Network (AMON) framework, have developed a multimessenger joint search for extragalactic astrophysical sources. This analysis looks for sources that emit both cosmic neutrinos and gamma rays that are produced in photohadronic or hadronic interactions. The AMON system is running continuously, receiving subthreshold data (i.e. data that are not suited on their own to do astrophysical searches) from HAWC and IceCube, and combining them in real time. Here we present the analysis algorithm, as well as results from archival data collected between 2015 June and 2018 August, with a total live time of 3.0 yr. During this period we found two coincident events that have a false-alarm rate (FAR) of, SCOPUS: ar.j, info:eu-repo/semantics/published
Published: 2021

94. HAWC observations of the acceleration of very-high-energy cosmic rays in the Cygnus Cocoon

Author: Abeysekara, A. U., primary, Albert, A., additional, Alfaro, R., additional, Alvarez, C., additional, Camacho, J. R. Angeles, additional, Arteaga-Velázquez, J. C., additional, Arunbabu, K. P., additional, Rojas, D. Avila, additional, Solares, H. A. Ayala, additional, Baghmanyan, V., additional, Belmont-Moreno, E., additional, BenZvi, S. Y., additional, Blandford, R., additional, Brisbois, C., additional, Caballero-Mora, K. S., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Cotti, U., additional, León, S. Coutiño de, additional, De la Fuente, E., additional, Hernandez, R. Diaz, additional, Dingus, B. L., additional, DuVernois, M. A., additional, Durocher, M., additional, Díaz-Vélez, J. C., additional, Ellsworth, R. W., additional, Engel, K., additional, Espinoza, C., additional, Fan, K. L., additional, Fang, K., additional, Fleischhack, H., additional, Fraija, N., additional, Galván-Gámez, A., additional, Garcia, D., additional, García-González, J. A., additional, Garfias, F., additional, Giacinti, G., additional, González, M. M., additional, Goodman, J. A., additional, Harding, J. P., additional, Hernandez, S., additional, Hinton, J., additional, Hona, B., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Hüntemeyer, P., additional, Iriarte, A., additional, Jardin-Blicq, A., additional, Joshi, V., additional, Kieda, D., additional, Lara, A., additional, Lee, W. H., additional, Vargas, H. León, additional, Linnemann, J. T., additional, Longinotti, A. L., additional, Luis-Raya, G., additional, Lundeen, J., additional, Malone, K., additional, Martinez, O., additional, Martinez-Castellanos, I., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Miranda-Romagnoli, P., additional, Morales-Soto, J. A., additional, Moreno, E., additional, Mostafá, M., additional, Nayerhoda, A., additional, Nellen, L., additional, Newbold, M., additional, Nisa, M. U., additional, Noriega-Papaqui, R., additional, Olivera-Nieto, L., additional, Omodei, N., additional, Peisker, A., additional, Pérez Araujo, Y., additional, Pérez-Pérez, E. G., additional, Ren, Z., additional, Rho, C. D., additional, Rosa-González, D., additional, Ruiz-Velasco, E., additional, Salazar, H., additional, Greus, F. Salesa, additional, Sandoval, A., additional, Schneider, M., additional, Schoorlemmer, H., additional, Serna, F., additional, Smith, A. J., additional, Springer, R. W., additional, Surajbali, P., additional, Tollefson, K., additional, Torres, I., additional, Torres-Escobedo, R., additional, Ureña-Mena, F., additional, Weisgarber, T., additional, Werner, F., additional, Willox, E., additional, Zepeda, A., additional, Zhou, H., additional, De León, C., additional, and Álvarez, J. D., additional
Published: 2021
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95. Interplanetary Magnetic Flux Rope Observed at Ground Level by HAWC

Author: Akiyama, S., primary, Alfaro, R., additional, Alvarez, C., additional, Angeles Camacho, J. R., additional, Arteaga-Velázquez, J. C., additional, Arunbabu, K. P., additional, Avila Rojas, D., additional, Solares, H. A. Ayala, additional, Belmont-Moreno, E., additional, Caballero-Mora, K. S., additional, Capistrán, T., additional, Carramiñana, A., additional, Casanova, S., additional, Colin-Farias, P., additional, Cotti, U., additional, Cotzomi, J., additional, De la Fuente, E., additional, de León, C., additional, Hernandez, R. Diaz, additional, Espinoza, C., additional, Fraija, N., additional, Galván-Gámez, A., additional, Garcia, D., additional, García-González, J. A., additional, Garfias, F., additional, González, M. M., additional, Goodman, J. A., additional, Harding, J. P., additional, Hona, B., additional, Huang, D., additional, Hueyotl-Zahuantitla, F., additional, Hüntemeyer, P., additional, Iriarte, A., additional, Joshi, V., additional, Kieda, D., additional, Kunde, G. J., additional, Lara, A., additional, Vargas, H. León, additional, Luis-Raya, G., additional, Malone, K., additional, Martínez-Castro, J., additional, Matthews, J. A., additional, Miranda-Romagnoli, P., additional, Moreno, E., additional, Nayerhoda, A., additional, Nellen, L., additional, Newbold, M., additional, Niembro, T., additional, Nieves-Chinchilla, T., additional, Noriega-Papaqui, R., additional, Pérez-Pérez, E. G., additional, Preisser, L., additional, Rho, C. D., additional, Ryan, J., additional, Salazar, H., additional, Salesa Greus, F., additional, Sandoval, A., additional, Springer, R. W., additional, Torres, I., additional, Ureña-Mena, F., additional, Villaseñor, L., additional, and Zepeda, A., additional
Published: 2020
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96. HAWC Search for High-mass Microquasars.

Author: Albert, A., Alfaro, R., Alvarez, C., Camacho, J. R. Angeles, Arteaga-Velázquez, J. C., Arunbabu, K. P., Rojas, D. Avila, Solares, H. A. Ayala, Baghmanyan, V., Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramińana, A., Casanova, S., Cotti, U., Cotzomi, J., De la Fuente, E., and de León, C.
Published: 2021
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97. Constraining the p-/p Ratio in TeV Cosmic Rays with Observations of the Moon Shadow by HAWC

Author: Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Arceo, R., Arteaga-Vel��zquez, J. C., Rojas, D. Avila, Solares, H. A. Ayala, Belmont-Moreno, E., BenZvi, S. Y., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistr��n, T., Carrami��ana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., de Le��n, S. Couti��o, De Le��n, C., la Fuentem, E. D, Hernandez, R. Diaz, Dichiara, S., Dingus, B. L., DuVernois, M. A., Ellsworth, R. W., Engels, K., Enr��quez-Rivera, O., Fleischhack, H., Fraija, N., Galv��n-G��mez, A., Garc��a-Gonz��lez, J. A., Mu��oz, A. Gonz��lez, Gonz��lez, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hona, B., Hueyotl-Zahuantitla, F., Hui, C. M., H��ntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lee, W. H., Vargas, H. Le��n, Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Luna-Garc��a, R., L��pez-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Mart��nez-Castro, J., Mart��nez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostaf��, M., Nayerhoda, A., Nellena, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., P��rez-P��rez, E. G., Ren, Z., Rho, C. D., Rivi��re, C., Rosa-Gonz��lez, D., Rosenberg, M., Ruiz-Velasco, E., Greus, F. Salesa, Sandoval, A., Schneider, M., Schoorlemmer, H., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Villase��or, L., Weisgarber, T., Westerhoff, S., Wood, J., Yapici, T., Yodha, G. B., Zepeda, A., Zhou, H., Alvarez, J. D., and HAWC Collaboartion
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), HAWC - Abteilung Hinton, Astrophysics::High Energy Astrophysical Phenomena, Physics::Space Physics, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract: An indirect measurement of the antiproton flux in cosmic rays is possible as the particles undergo deflection by the geomagnetic field. This effect can be measured by studying the deficit in the flux, or shadow, created by the Moon as it absorbs cosmic rays that are headed towards the Earth. The shadow is displaced from the actual position of the Moon due to geomagnetic deflection, which is a function of the energy and charge of the cosmic rays. The displacement provides a natural tool for momentum/charge discrimination that can be used to study the composition of cosmic rays. Using 33 months of data comprising more than 80 billion cosmic rays measured by the High Altitude Water Cherenkov (HAWC) observatory, we have analyzed the Moon shadow to search for TeV antiprotons in cosmic rays. We present our first upper limits on the $\bar{p}/p$ fraction, which in the absence of any direct measurements, provide the tightest available constraints of $\sim1\%$ on the antiproton fraction for energies between 1 and 10 TeV., 10 pages, 5 figures. Accepted by Physical Review D
Published: 2018

98. Spectrum and Morphology of the Very-high-energy Source HAWC J2019+368.

Author: Albert, A., Alfaro, R., Alvarez, C., Arteaga-Velázquez, J. C., Arunbabu, K. P., Rojas, D. Avila, Solares, H. A. Ayala, Baghmanyan, V., Belmont-Moreno, E., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramińana, A., Casanova, S., Cotzomi, J., de León, S. Coutińo, De la Fuente, E., Hernandez, R. Diaz, Dingus, B. L., and DuVernois, M. A.
Subjects: MORPHOLOGY, NEBULAE, PULSARS, SUPERNOVA remnants
Abstract: The MGRO J2019+37 region is one of the brightest sources in the sky at TeV energies. It was detected in the second HAWC catalog as 2HWC J2019+367 and here we present a detailed study of this region using data from HAWC. This analysis resolves the region into two sources: HAWC J2019+368 and HAWC J2016+371. We associate HAWC J2016+371 with the evolved supernova remnant CTB 87, although its low significance in this analysis prevents a detailed study at this time. An investigation of the morphology (including possible energy-dependent morphology) and spectrum for HAWC J2019+368 is the focus of this work. We associate HAWC J2019+368 with PSR J2021+3651 and its X-ray pulsar wind nebula, the Dragonfly nebula. Modeling the spectrum measured by HAWC and Suzaku reveals a ∼7 kyr pulsar and nebula system producing the observed emission at X-ray and γ-ray energies. [ABSTRACT FROM AUTHOR]
Published: 2021
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99. Evidence that Ultra-high-energy Gamma Rays Are a Universal Feature near Powerful Pulsars.

Author: Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Camacho, J. R. Angeles, Arteaga-Velázquez, J. C., Arunbabu, K. P., Rojas, D. Avila, Solares, H. A. Ayala, Baghmanyan, V., Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramińana, A., Casanova, S., Cotti, U., Cotzomi, J., and de León, S. Coutińo
Published: 2021
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100. A Survey of Active Galaxies at TeV Photon Energies with the HAWC Gamma-Ray Observatory.

Author: Albert, A., Alvarez, C., Camacho, J. R. Angeles, Arteaga-Velázquez, J. C., Arunbabu, K. P., Rojas, D. Avila, Solares, H. A. Ayala, Baghmanyan, V., Belmont-Moreno, E., BenZvi, S. Y., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramińana, A., Casanova, S., Cotti, U., Cotzomi, J., de León, S. Coutińo, De la Fuente, E., and Dingus, B. L.
Subjects: ACTIVE galactic nuclei, PHOTONS, RADIO galaxies, PAIR production, OBSERVATORIES, ACTIVE galaxies, BL Lacertae objects
Abstract: The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory continuously detects TeV photons and particles within its large field of view, accumulating every day a deeper exposure of two-thirds of the sky. We analyzed 1523 days of HAWC live data acquired over four and a half years, in a follow-up analysis of 138 nearby (z < 0.3) active galactic nuclei from the Third Catalog of Hard Fermi-LAT sources culminating within 40° of the zenith at Sierra Negra, the HAWC site. This search for persistent TeV emission used a maximum-likelihood analysis assuming intrinsic power-law spectra attenuated by pair production of gamma-ray photons with the extragalactic background light. HAWC clearly detects persistent emission from Mkn 421 and Mkn 501, the two brightest blazars in the TeV sky, at 65σ and 17σ level, respectively. Marginal evidence, just above the 3σ level, was found for three other known very high-energy emitters: the radio galaxy M87 and the BL Lac objects VER J0521+211 and 1ES 1215+303, the latter two at z ∼ 0.1. We find a 4.2σ evidence for collective emission from the set of 30 previously reported very high-energy sources, with Mkn 421 and Mkn 501 excluded. Upper limits are presented for the sample under the power-law assumption and in the predefined (0.5–2.0), (2.0–8.0), and (8.0–32.0) TeV energy intervals. [ABSTRACT FROM AUTHOR]
Published: 2021
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