Los Alamos National Laboratory Searching for Dark Matter with HAWC ● J. Patrick Harding ● 8/1/17 ● Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA
Los Alamos National Laboratory The High Altitude Water Cherenkov Observatory 22,000 m 2 air shower array 300 Water Cherenkov detectors (WCD) Citlaltepetl 200,000 liters of purified water per WCD Pico de Orizaba 5160m a.s.l. 4 sensors (photo-multiplier tubes) per WCD Completed March 2015 L arge M illimeter T elescope Tliltepetl Sierra Negra HAWC 4582m a.s.l. 4100 m a.s.l. 8/1/17 | 2
Los Alamos National Laboratory Extensive Air Shower Arrays 8/1/17 | 3
Los Alamos National Laboratory HAWC is the most sensitive observatory to the highest- energy gamma rays • HAWC has ~2.4 sr field of view and observes ~2/3 of the sky each day arXiv:1701.01778 • Long integration times give sensitivity to the highest energy gamma rays • Angular resolution and field of view are similar to Fermi LAT 8/1/17 | 4
Los Alamos National Laboratory HAWC is the most sensitive observatory to the highest- energy gamma rays • HAWC has ~2.4 sr field of view and observes ~2/3 of the sky each day For More on HAWC, see K. Tollefson's talk from Monday arXiv:1701.01778 • Long integration times give sensitivity to the highest energy gamma rays • Angular resolution and field of view are similar to Fermi LAT 8/1/17 | 5
Los Alamos National Laboratory Over 20 Months of HAWC Data arXiv:1702.02992 8/1/17 | 6
Los Alamos National Laboratory Dark Matter Sources in the HAWC Sky 8/1/17 | 7
Los Alamos National Laboratory Where HAWC is Looking for Dark Matter 10 5 Data is being taken on 2/3 of the sky, every day Galaxy Clusters 10 4 M31 10 3 Galaxy Distance (kpc) 10 2 Dwarf Galaxies Galactic 10 1 Center 10 12 10 6 10 9 10 15 Mass (Solar Masses) 8/1/17 | 8
Los Alamos National Laboratory HAWC Dark Matter Annihilation Limits from Dwarf Galaxies 8/1/17 | 9
Los Alamos National Laboratory HAWC Dark Matter Annihilation Limits from Dwarf Galaxies 8/1/17 | 10
Los Alamos National Laboratory HAWC Dark Matter Decay Limits from Dwarf Galaxies 8/1/17 | 11
Los Alamos National Laboratory HAWC Dark Matter Decay Limits from Dwarf Galaxies 8/1/17 | 12
Los Alamos National Laboratory HAWC Dark Matter Annihilation Limits from the Galactic Halo 8/1/17 | 13
Los Alamos National Laboratory HAWC Dark Matter Decay Limits from the Galactic Halo 8/1/17 | 14
Los Alamos National Laboratory Upcoming Dark Matter Analyses with HAWC • M31 (Andromeda) Galaxy – Nearby, large J-factor • Virgo Cluster – Nearest galaxy cluster For More, See A. Albert talk at TeVPA – Large D-factor • Dwarf Irregular Galaxies – Similar Analysis Method to Dwarf Spheroidal Galaxies • Stacked Galaxy Clusters – Thousands of low-J, low-D sources combine to give strong dark matter search 8/1/17 | 15
Los Alamos National Laboratory Looking Forward: HAWC Outriggers • 350 small WCD outrigger detectors ● Cover an area 4x HAWC • Sensitivity increase by 3-4x above 50 TeV Simulation • Deployment in progress 8/1/17 | 16
Los Alamos National Laboratory Backups 8/1/17 | 17
Los Alamos National Laboratory Shower Reconstruction ● Measure: time and light level in each of our detectors ● Estimate: direction, location, energy, and background rejection Measured Time Measured Light Level 8/1/17 | 18
Los Alamos National Laboratory Gamma/Hadron Separation γ ray Hadron E 8/1/17 | 19
Los Alamos National Laboratory Dark Matter Annihilation and Decay from T. Yapici 8/1/17 | 20
Los Alamos National Laboratory J-factors and D-factors from T. Yapici 8/1/17 | 21
Los Alamos National Laboratory Systematic Uncertainties from T. Yapici 8/1/17 | 22
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