Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-11
Astrophys.J.638:397-408,2006
Astronomy and Astrophysics
Astrophysics
13 pages, 26 figures, emulateapj.cls, to appear in ApJ
Scientific paper
10.1086/498858
We made stereoscopic observations of the Vela Pulsar region with two of the 10 m diameter CANGAROO-III imaging atmospheric Cherenkov telescopes in January and February, 2004, in a search for sub-TeV gamma-rays from the pulsar and surrounding regions. We describe the observations, provide a detailed account of the calibration methods, and introduce the improved and bias-free analysis techniques employed for CANGAROO-III data. No evidence of gamma-ray emission is found from either the pulsar position or the previously reported position offset by 0.13 degree, and the resulting upper limits are a factor of five less than the previously reported flux from observations with the CANGAROO-I 3.8 m telescope. Following the recent report by the H.E.S.S. group of TeV gamma-ray emission from the Pulsar Wind Nebula, which is $\sim$0.5 degree south of the pulsar position, we examined this region and found supporting evidence for emission extended over $\sim$0.6 degree.
Adachi Yuki
Edwards Philip G.
Enomoto Ryoji
Kabuki Shigeto
Tsuchiya Ken'ichi
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