Detection of Sub-TeV gamma-rays from the Galactic Center with the CANGAROO-II telescope

Details Detection of Sub-TeV gamma-rays from the Galactic Center with the CANGAROO-II telescope Detection of Sub-TeV gamma-rays from the Galactic Center with the CANGAROO-II telescope

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..745..403t&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: 2nd International Symposium on High Energy Gamma-Ray Astronomy. AIP Conference Proceedings, Vo

Astronomy and Astrophysics

Astronomy

Galactic Center, Bar, Circumnuclear Matter, And Bulge, Gamma-Ray Sources, Gamma-Ray Bursts, X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

The Galactic Center has been observed with the CANGAROO-II imaging atmospheric Cherenkov telescope in 2001 and 2002. We detected a statistically significant excess at energies greater than 250GeV. This is the first detection of sub-TeV gamma rays from the Galactic Center region. The signal direction is consistent with the Galactic Center, which includes the massive black hole Sgr A* and supernova remnant Sgr A East. The resultant flux is 1 order of magnitude lower than that of the Crab Nebula at 1 TeV. The differential flux has a steep spectrum and the power law index is observed to be -4.6 +/- 0.5, although it could flatten to -3.4 if the uncertainty in energy determination is included. Here, the analysis for reduction of night sky background effects and the radiation mechanism of sub-TeV gamma rays are reported. The most probable radiation mechanism is π0 decays. The maximum energy of the inferred cosmic rays is 1-3 TeV and the total cosmic-ray luminosity corresponds to 1 ~ 10 supernova remnants. We also obtain an upper limit on the cold dark matter density in the galactic halo.

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