A Search for sub-TeV Gamma-rays from the Vela Pulsar Region with CANGAROO-III

Abstract

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.

13 pages, 26 figures, emulateapj.cls, to appear in ApJ

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• Detection of Gamma-Ray Emission from the Vela Pulsar Wind Nebula with AGILE
• Very-high energy gamma-ray astronomy: A 23-year success story in high-energy astroparticle physics
• CANGAROO-III Observations of the supernova remnant RX J0852.0$-$4622
• CANGAROO-III Search for Gamma Rays from Centaurus A and the $\omega$ Centauri Region
• CANGAROO-III Observations of the 2006 Outburst of PKS2155-304
• CANGAROO-III search for TeV Gamma-rays from two clusters of galaxies
• Ground-based gamma-ray astronomy: history and development of techniques
• High Energy Processes in Pulsar Wind Nebulae
• Observation of an extended VHE gamma-ray emission from MSH 15-52 with CANGAROO-III
• Erratum: Detection of diffuse TeV gamma-ray emission from the nearby starburst galaxy NGC 253
• Observation of Very High Energy Gamma Rays from HESS J1804-216 with CANGAROO-III Telescopes
• CANGAROO-III Search for Gamma Rays from Kepler's Supernova Remnant
• CANGAROO-III observation of TeV gamma rays from the unidentified gamma-ray source HESS J1614-518
• CANGAROO-III Observation of TeV Gamma Rays from the vicinity of PSR B1 706-44
• CANGAROO-III Search for Gamma Rays from SN 1987A and the Surrounding Field
• Searches for very high energy gamma rays from blazars with CANGAROO-III telescope in 2005-2009