Status of an Atmospheric Cherenkov Imaging Camera for the - - PowerPoint PPT Presentation

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Status of an Atmospheric Cherenkov Imaging Camera for the CANGAROO-III Experiment and Perspective of the Field Kenichi Tsuchiya ICRR ( University of Tokyo ) 1. Atmospheric Chrenkov Telescope 2. Camera of the CANGAROO-III experiment 3.

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Status of an Atmospheric Cherenkov Imaging Camera for the CANGAROO-III Experiment and Perspective of the Field Ken’ichi Tsuchiya ICRR ( University of Tokyo )

  • 1. Atmospheric Chrenkov Telescope
  • 2. Camera of the CANGAROO-III experiment
  • 3. Perspective of the Field (Dark matter search…)
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CANGAROO

Collaboration of Australia and Nippon(Japan) for a GAmma-Ray Observatory in the Outback Outback = Desert for the observations in the dark site Southern hemisphere galactic objects Very high energy gamma-rays Cherenkov light

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The Techniques of High energy gamma-ray astronomy

100GeV - 10TeV gamma-ray Large acceptance (109 cm2 )

100GeV -10TeV 100MeV-10GeV Energy 3 - 4 degree 30 degree F.O.V 109 cm2 103 cm2 Acceptance IACT (Imaging Atmospheric Cherenkov Telescope） Satellite (EGRET)

10km

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Imaging analysis

I mage axis Length Width Distance I mage centroid alpha Target center gamma proton 10km Shower developments 1TeV Gamma-ray : proton = 1:1000 20km Gamma-ray Proton Focal plane camera images Fine pixel camera 99.7% rejection Wide field of view

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The history of CANGAROO

Large mirror low energy threshold Large field of view and fine pixel

CANGAROO-I CANGAROO-II 3.8m 7m10m 1992-1998 1999- 3 degree 256 PMTs 3 degree 552 PMTs 0.12 degree

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Better angular resolution 0.2 degree 0.05 degree Better energy resolution 30% 15%

CANGAROO-III : stereoscopic observation

Cherenkov light pool 125 m radius Focal plane camera image 100 m

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CANGAROO-III Camera

Large Field of view 3 4 degree 427x0.17° pixels with light guides Controlled High Voltage to each PMT Low noise Large dynamic range

with good linearity

Kabuki et al. N.I.M. A500 318-336 (2003) CANGAROO-II CANGAROO-III

Photo Multiplier Tube(PMT)

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Real data

Photons of Cherenkov light Shower energy good timing resolution ~ 1ns TDC ADC Bright star in the field of view PMT current Cut down high voltage

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Accelerators in the universe

highly accelerated protons + matters electrons + photons exotic origin ? SN1006 (TeV gamma-ray, X-ray) SNR RX J1713.7-3946 The origin of cosmic-ray? Supernova Remnant (SNR) Very High Energy Gamma-rays

Enomoto et al. Nature 416 823-826(2002) Tanimori et al. ApJ 497 L25(1998) Itoh et al. ApJL 584 L65-L68 (2002)

NGC253

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10 “Known” objects: SNRs, pulsars, Active Galactic Nuclei… New type objects

starburst galaxies, molecular clouds The Galactic Center

What should we select as the target?

EGRET detected Gamma -rays from the galactic center. (100MeV-10GeV) VLA radio continuum image (6cm) Radio image (90cm) CANGAROO-III F.O.V.

Massive black hole Supernova remnant Dark matter??

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Dark matter search – Galactic Center

  • Concentration of Cold Dark Matter

toward the Galactic Center

  • MSSM (Minimal super symmetric

model)

  • Neutralino annihilations

Gondolo&Silk Phy.Rev.Let, 83(1999) 1719-1722 CANGAROO-III Sensitivity Gamma-ray energy

Enhanced density at the Galactic Center

Bergstrom et al Astroparticle Phys. (1997)

v M rayFlux gamma σ ρ

χ 2

) ( ∝ −

γ χχ 2 →

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Galactic Center observations with CANGAROO-II telescope

Observation data

2001 July (20.3 hours) 2002 July, August (50.3 hours) preliminary result

2002 data is under analysis

Tsuchiya et al. 28th ICRC (2003)

2001

Alpha distributions These excess events indicate gamma-rays from the galactic center (E > 400GeV) Preliminary! On-source OFF-source Subtracted events Alpha

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Summary

CANGAROO-III camera works well and will

start stereoscopic observations with four telescopes in 2004.

We search the origin of cosmic-ray with

the observation of SNR,pulsar,AGN …

IACT is one of the Dark matter search

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CANGAROO collaboration

Ibaraki University Institute for Cosmic Ray Research, University of Tokyo Institute of Space and Astronautical Science National Astronomical Observatory of Japan Tokai University Tokyo Institute of Technology Kyoto University Solar-Terrestrial Environmental Laboratory, Nagoya University Yamagata University Yamanashi Gakuin University Osaka City University Konan University Ibaraki Prefectural University of Health Sciences Shinshu University Kitasato University University of Adelaide Mt Stromlo and Siding Spring Observatories, Australian National University