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Diffuse Gamma-Ray Emission

Diffuse Gamma-Ray Emission. Su Yang 2010.1.12. Telescopes Examples Our work. VERITAS (Very Energetic Radiation Imaging Telescope Array System): 4*12*345. angular resolution: 0.1d@1TeV, 0.14d@200 GeV (68% containment radius) energy range: 100 GeV to >30 TeV

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Diffuse Gamma-Ray Emission

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  1. Diffuse Gamma-Ray Emission Su Yang 2010.1.12

  2. Telescopes • Examples • Our work

  3. VERITAS (Very Energetic Radiation Imaging Telescope Array System): 4*12*345 • angular resolution: 0.1d@1TeV, 0.14d@200 GeV (68% containment radius) • energy range: 100 GeV to >30 TeV • energy resolution: 15% at 1 TeV • source location accuracy: 50’’

  4. H.E.S.S. (High Energy Stereoscopic System): 4*13*382 • energy resolution: 15% (Index~0.1; Flux~20%) • energy range: 0.1-10 TeV • PSF: 0.03/0.06d • FOV: 5d

  5. CR density (M82)~500*CR density (our Galaxy): SNe & Winds from massive stars Chandra;Spitzer; Hubble;

  6. SNR G106.3+2.7 (60*24’; D~0.8kpc; Boomerang) Fermi (PSR J2229+6114) 3EG J2227+6122 0.4d Radio CO (-6, -4 km/s)

  7. IC443: 1.5kpc, 45’; CXOU J061705.3+222127; (VER J0616.9+2230 ~ Magic J0616+225 ~ Milagro; 0FGL J0617.4+2234 ~ 3EG J0617+2238; ) Radio EGRET Fermi Magic OH PWN CO (-20,20km/s)

  8. IC: L(0.3-2.0TeV)~4E32 erg/s E (rotation)~1-50E36 erg/s • Synchrotron cooling: Time (E)~ 1.3E7 (B/uG)-2 (E/GeV)-1 kyr E(electron)~20TeV, B~5uG  Time~30 kyr (Abdo et al., 2010, B(Cas A)>=0.1mG) • Hadronic CRs Particles were accelerated prior to the shock hitting the MC？ Or an energy-dependent rate of diffusion of CRs out of the MC？

  9. VERITAS (Northern Sky) AGN, BIN, PWN, starburst galaxy, SNR, UNID VERITAS HESS EGRET+GLAST

  10. Fermi (GLAST: Gamma-ray Large Area Space Telescope): 2008-06-11 >9000 sources 271 sources

  11. Dark Matter? Variations of the Galaxy’s CR spectra? Unresolved point sources? Instrumental effects? 1-10GeV excess?

  12. The DGE (diffuse Galactic emission): CRs (protons, electrons) the ISM (Pi0-decay + bremsstrahlung), and radiation field (IC); 10-15%

  13. (Abdo et al., 2010, B(Cas A)>=0.1mG)

  14. (Abdo et al., 2010, B(Cas A)>=0.1mG) Leptonic model Hadronic model

  15. 1, The Fermi Gamma-Ray Space Telescope Discovers the Pulsar in the Young Galactic Supernova Remnant CTA 1. Science, 2008, 322, 1218 2, Discovery of Pulsed gamma-Rays from the Young Radio Pulsar PSR J1028–5819 with the Fermi Large Area Telescope. ApJ, 2009, 695, L72 3, Fermi Large Area Telescope Observations of the Vela Pulsar. ApJ, 2009, 696, 1084 4, Measurement of the Cosmic Ray e++e- Spectrum from 20GeV to 1TeV with the Fermi Large Area Telescope. PRL, 2009, 102, 1101 5, Pulsed Gamma Rays from the Millisecond Pulsar J0030+0451 with the Fermi Large Area Telescope. ApJ, 2009, 699, 1171 6, Discovery of Pulsations from the Pulsar J0205+6449 in SNR 3C 58 with the Fermi Gamma-Ray Space Telescope. ApJ, 2009, 699, L102 7, Pulsed Gamma-rays from PSR J2021+3651 with the Fermi Large Area Telescope. ApJ, 2009, 700, 1059 8, Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT. Science, 2009, 325, 8409, Pulsed Gamma-rays from PSR J2021+3651 with the Fermi Large Area Telescope. ApJ, 2009, 700, 1059 10, Fermi LAT Observation of Diffuse Gamma Rays Produced Through Interactions Between Local Interstellar Matter and High-energy Cosmic Rays. ApJ, 2009, 703, 1249

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