CANGAROO-III Search for Gamma Rays from Centaurus A and the $\omega$ Centauri Region

TL;DR

This study used the CANGAROO-III telescope system to search for TeV gamma rays from Centaurus A and $$ Centauri, setting upper limits on gamma-ray fluxes and discussing implications for cosmic rays and dark matter.

Contribution

First observational search for TeV gamma rays from Centaurus A and $$ Centauri using the CANGAROO-III system, establishing flux upper limits.

Findings

No significant gamma-ray detection above 420 GeV.

Flux upper limits were derived for both targets.

Implications discussed for cosmic ray energy and dark matter density.

Abstract

We have observed the giant radio galaxy Centaurus A and the globular cluster $\omega$ Centauri in the TeV energy region using the CANGAROO-III stereoscopic system. The system has been in operation since 2004 withan array of four Imaging Atmospheric Cherenkov Telescopes (IACT) with $\sim$100-m spacings. The observations were carried out in March and April 2004. In total, approximately 10 hours data were obtained for each target.No statistically significant gamma-ray signal has been found above 420 GeV over a wide angular region (a one-degree radius from thepointing center) and we derive flux upper limits using all of the field of view.Implications for the total energy of cosmic rays and the density of the cold dark matter are considered.