Diffuse Gamma-Ray Emission Su Yang 2010.1.19. Telescopes Examples Our work.

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Presentation transcript:

Diffuse Gamma-Ray Emission Su Yang

Telescopes Examples Our work

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

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

CR density (M82)~500*CR density (our Galaxy): SNe & Winds from massive stars Chandra; Spitzer; Hubble; VERITAS Telescopes Help Solve 100-Year-Old Mystery ； The Origin of CRs, Nature, 2009 Web Source

Fermi (PSR J ) 3EG J CO (-6, -4 km/s) Radio SNR G (60*24’; D~0.8kpc; Boomerang) 0.4d Acciari et al. 2009, arXiv

Fermi OH CO (-20,20km/s) PWN Radio Magic IC443: 1.5kpc, 45’; CXOU J ; (VER J ~ Magic J ~ Milagro; 0FGL J ~ 3EG J ; ) EGRET Acciari et al. 2009, ApJ, 698:L133-L137

IC: L( TeV)~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 ？ Acciari et al. 2009, ApJ, 698:L133-L137

VERITAS HESS EGRET+GLAST VERITAS (Northern Sky) AGN, BIN, PWN, starburst galaxy, SNR, UNID Ong et al. 2009, arxiv Web Source

Fermi (GLAST: Gamma-ray Large Area Space Telescope): >9000 sources 271 sources

Web Source

1-10GeV excess? Dark Matter? Variations of the Galaxy’s CR spectra? Unresolved point sources? Instrumental effects? Abdo et al. 2009, arXiv

10-15% The DGE (diffuse Galactic emission): CRs (protons, electrons)  the ISM (Pi0-decay + bremsstrahlung), and radiation field (IC); Abdo et al. 2009, arXiv

(Abdo et al., 2010, arXiv: ; B(Cas A)>=0.1mG)

Leptonic modelHadronic model (Abdo et al., 2010, arXiv: ; B(Cas A)>=0.1mG)

1, The Fermi Gamma-Ray Space Telescope Discovers the Pulsar in the Young Galactic Supernova Remnant CTA 1. Science, 2008, 322, , 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, , Measurement of the Cosmic Ray e++e- Spectrum from 20GeV to 1TeV with the Fermi Large Area Telescope. PRL, 2009, 102, , Pulsed Gamma Rays from the Millisecond Pulsar J with the Fermi Large Area Telescope. ApJ, 2009, 699, , Discovery of Pulsations from the Pulsar J in SNR 3C 58 with the Fermi Gamma-Ray Space Telescope. ApJ, 2009, 699, L102 7, Pulsed Gamma-rays from PSR J with the Fermi Large Area Telescope. ApJ, 2009, 700, , Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT. Science, 2009, 325, 840 9, Pulsed Gamma-rays from PSR J with the Fermi Large Area Telescope. ApJ, 2009, 700, , Fermi LAT Observation of Diffuse Gamma Rays Produced Through Interactions Between Local Interstellar Matter and High-energy Cosmic Rays. ApJ, 2009, 703, 1249 Some GLAST results: Just For the Milk Way