with HAWC J. Patrick Harding 8/1/17 Operated by Los Alamos - - PowerPoint PPT Presentation

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with HAWC J. Patrick Harding 8/1/17 Operated by Los Alamos - - PowerPoint PPT Presentation

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


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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

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SLIDE 2

Los Alamos National Laboratory 8/1/17 | 2

The High Altitude Water Cherenkov Observatory

Citlaltepetl Pico de Orizaba 5160m a.s.l. Tliltepetl Sierra Negra 4582m a.s.l.

Large Millimeter Telescope

 22,000 m

2 air shower array

 300 Water Cherenkov detectors (WCD)  200,000 liters of purified water per WCD  4 sensors (photo-multiplier tubes) per WCD  Completed March 2015

HAWC

4100 m a.s.l.

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Los Alamos National Laboratory 8/1/17 | 3

Extensive Air Shower Arrays

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Los Alamos National Laboratory 8/1/17 | 4

HAWC is the most sensitive

  • bservatory to the highest-

energy gamma rays

  • Long integration times give

sensitivity to the highest energy gamma rays

  • Angular resolution and field of

view are similar to Fermi LAT

arXiv:1701.01778

  • HAWC has ~2.4 sr

field of view and

  • bserves ~2/3 of the

sky each day

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SLIDE 5

Los Alamos National Laboratory 8/1/17 | 5

HAWC is the most sensitive

  • bservatory to the highest-

energy gamma rays

  • Long integration times give

sensitivity to the highest energy gamma rays

  • Angular resolution and field of

view are similar to Fermi LAT

arXiv:1701.01778

  • HAWC has ~2.4 sr

field of view and

  • bserves ~2/3 of the

sky each day

For More on HAWC, see K. Tollefson's talk from Monday

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SLIDE 6

Los Alamos National Laboratory 8/1/17 | 6

Over 20 Months of HAWC Data

arXiv:1702.02992

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Los Alamos National Laboratory 8/1/17 | 7

Dark Matter Sources in the HAWC Sky

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Los Alamos National Laboratory 8/1/17 | 8

Where HAWC is Looking for Dark Matter

Mass (Solar Masses) Distance (kpc)

103 104 102 101 105 106 109 1012 1015

Dwarf Galaxies Galaxy Clusters M31 Galaxy Galactic Center Data is being taken on 2/3 of the sky, every day

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SLIDE 9

Los Alamos National Laboratory 8/1/17 | 9

HAWC Dark Matter Annihilation Limits from Dwarf Galaxies

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SLIDE 10

Los Alamos National Laboratory 8/1/17 | 10

HAWC Dark Matter Annihilation Limits from Dwarf Galaxies

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SLIDE 11

Los Alamos National Laboratory 8/1/17 | 11

HAWC Dark Matter Decay Limits from Dwarf Galaxies

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Los Alamos National Laboratory 8/1/17 | 12

HAWC Dark Matter Decay Limits from Dwarf Galaxies

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Los Alamos National Laboratory 8/1/17 | 13

HAWC Dark Matter Annihilation Limits from the Galactic Halo

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Los Alamos National Laboratory 8/1/17 | 14

HAWC Dark Matter Decay Limits from the Galactic Halo

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Los Alamos National Laboratory 8/1/17 | 15

Upcoming Dark Matter Analyses with HAWC

  • M31 (Andromeda) Galaxy

– Nearby, large J-factor

  • Virgo Cluster

– Nearest galaxy cluster – 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

For More, See A. Albert talk at TeVPA

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Los Alamos National Laboratory 8/1/17 | 16

Looking Forward: HAWC Outriggers

  • 350 small WCD outrigger detectors
  • Cover an area 4x HAWC
  • Sensitivity increase by 3-4x above 50 TeV
  • Deployment in progress

Simulation

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Los Alamos National Laboratory 8/1/17 | 17

Backups

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Los Alamos National Laboratory 8/1/17 | 18

  • Measure: time and light level in each of our detectors
  • Estimate: direction, location, energy, and background

rejection

Shower Reconstruction

Measured Time Measured Light Level

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Los Alamos National Laboratory 8/1/17 | 19

Gamma/Hadron Separation

γ ray Hadron E

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Los Alamos National Laboratory 8/1/17 | 20

Dark Matter Annihilation and Decay

from T. Yapici

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Los Alamos National Laboratory 8/1/17 | 21

J-factors and D-factors

from T. Yapici

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Los Alamos National Laboratory 8/1/17 | 22

Systematic Uncertainties

from T. Yapici