CANGAROO-III Observation of TeV Gamma Rays from the Vicinity of PSR B1706-44

Enomoto, R; Kushida, J; Nakamori, T; Kifune, T; Bicknell, Geoffrey; Clay, Roger W; Edwards, P G; Gunji, S; Hara, S; Hara, T; Hattori, T; Hayashi, S

CANGAROO-III Observation of TeV Gamma Rays from the Vicinity of PSR B1706-44

Date

2009

Authors

Enomoto, R

Kushida, J

Nakamori, T

Kifune, T

Bicknell, Geoffrey

Clay, Roger W

Edwards, P G

Gunji, S

Hara, S

Hara, T

Publisher

IOP Publishing

Abstract

Observation by the CANGAROO-III stereoscopic system of the Imaging Cherenkov Telescope has detected extended emission of TeV gamma rays in the vicinity of the pulsar PSR B1706-44. The strength of the signal observed as gamma-ray-like events varies when we apply different ways of emulating background events. The reason for such uncertainties is argued in relevance to gamma rays embedded in the "OFF-source data," that is, unknown sources and diffuse emission in the Galactic plane, namely, the existence of a complex structure of TeV gamma-ray emission around PSR B1706-44.