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A Visit to Ghost Ranch

A Visit to Ghost Ranch. Jim Linnemann Michigan State University & Los Alamos National Laboratory June 18, 2003. The Milagro All-Sky TeV Gamma-Ray Telescope. Look for high energy photons “particles” of light Photons point back see where they came from Recent Results Crab nebula

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A Visit to Ghost Ranch

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  1. A Visit to Ghost Ranch Jim Linnemann Michigan State University & Los Alamos National Laboratory June 18, 2003

  2. The Milagro All-Sky TeV Gamma-Ray Telescope • Look for high energy photons • “particles” of light • Photons point back • see where they came from • Recent Results • Crab nebula • All-sky survey • Galactic Plane • GRB searches

  3. What are Cosmic Rays? • Fast moving particles from— the cosmos: of no earthly origin ` But then, the same is true of starlight • Most are electrically charged • How do you see them? (Experimental Physics) • Finding a way to detect things • “extrasensory” perception • Real phenomena, right under our noses • The lure of secret knowledge still attracts…

  4. Milagro Detector

  5. Moon Shadow: Energy Scale Calibration Proton Response E = 640±70 GeV (MC 690 GeV) sq = 0.9o

  6. The moon’s shadow is sharp: blurred only by earth’s magnetic field and detector’s resolution

  7. The Sun Produces some Cosmic Rays: A Solar Prominence

  8. Material Ejected from the Sun by Magnetic Fields

  9. The sun’s magnetic field deflects cosmic rays and blurs its image Can use to study the sun

  10. A satellite The Milky Way—seen in light 100 million times more energetic than light from the sun

  11. A Source of Gamma Rays: The Crab Nebula Supernova seen in 1054 AD Still shining: light particles with 1 trillion times more energy than sunlight photons A spinning neutron star with a strong magnetic field (pulsar) Accelerates electrons, which transfer much of their energy to photons

  12. The Crab Nebula Cut Data On: 1,952,917 Off: 1,945,109 Excess: 7,808 (~10/day) Significance: 5.4 s Raw Data On: 16,987,703 Off: 16,981,520 Significance: 1.4 s

  13. An Active Galactic Nucleus

  14. Gravity, Magnetic Fields, and Relativity combine to send energetic light particles across the universe…

  15. Colliding neutron stars making black holes: one model for distant gamma ray bursts

  16. Sources change with energy: Leave traces in spectrum

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