The optical reflector system for the CANGAROO-II imaging atmospheric Cherenkov telescope

Kawachi, A.; Hayami, Y.; Jimbo, J.; Kamei, S.; Kifune, T.; Kubo, H.; Kushida, J.; LeBohec, S.; Miyawaki, Keizo; Mori, M.; Nishijima, K.; Patterson, Joseph; Suzuki, Ryo; Tanimori, T.; Yanagita, S.; Yoshikoshi, T.; Akizuki, Yuki

doi:10.1016/s0927-6505(00)00131-6

Cited by 46 publications

(28 citation statements)

References 12 publications

(13 reference statements)

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“…The 10 m telescope of CANGAROO-II has been in operation since April, 2000, and has detected SNR RX J1713.7−3946 (Enomoto et al 2002b) and the active galactic nuclei Mrk 421 . The telescope has a parabolic optical reflector consisting of 114 composite spherical mirrors (80 cm in diameter), made of carbon fiber reinforced plastic (CFRP) (Kawachi et al 2001). The principal parameters of the telescope are listed in Table 1.…”

Section: The Cangaroo-ii Telescopementioning

confidence: 99%

Evidence of TeV gamma-ray emission from the nearby starburst galaxy NGC 253

Itoh¹,

Enomoto²,

Yanagita³

et al. 2003

A&A

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Abstract. TeV gamma-rays were recently detected from the nearby normal spiral galaxy NGC 253 (Itoh et al. 2002). Observations to detect the Cherenkov light images initiated by gamma-rays from the direction of NGC 253 were carried out in 2000 and 2001 over a total period of ∼150 hours. The orientation of images in gamma-ray-like events is not consistent with emission from a point source, and the emission region corresponds to a size greater than 10 kpc in radius. Here, detailed descriptions of the analysis procedures and techniques are given.

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Section: The Cangaroo-ii Telescopementioning

confidence: 99%

Evidence of TeV gamma-ray emission from the nearby starburst galaxy NGC 253

Itoh¹,

Enomoto²,

Yanagita³

et al. 2003

A&A

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“…The oldest telescope, T1, which was the CANGAROO-II telescope, has not been in use since 2004 due to its smaller FOV and higher energy threshold. Each telescope has a 10 m diameter reflector which consists of 114 segmented fiber reinforced plastic spherical mirrors mounted on a parabolic frame (Kawachi et al 2001). The imaging camera system consists of 427 photomultipliers (PMTs) and has an FOV of 4.0 deg (Kabuki et al 2003).…”

Section: Observationsmentioning

confidence: 99%

CANGAROO-III OBSERVATION OF TeV GAMMA RAYS FROM THE UNIDENTIFIED GAMMA-RAY SOURCE HESS J1614–518

Mizukami¹,

Kubo²,

Yoshida³

et al. 2011

ApJ

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We report the detection, with the CANGAROO-III imaging atmospheric Cherenkov telescope array, of a very high energy gamma-ray signal from the unidentified gamma-ray source HESS J1614−518, which was discovered in the H.E.S.S. Galactic plane survey. Diffuse gamma-ray emission was detected above 760 GeV at the 8.9σ level during an effective exposure of 54 hr from 2008 May to August. The spectrum can be represented by a power law: (8.2 ± 2.2 stat ± 2.5 sys ) × 10 −12 × (E/1 TeV) −γ cm −2 s −1 TeV −1 with a photon index γ of 2.4 ± 0.3 stat ± 0.2 sys , which is compatible with that of the H.E.S.S. observations. By combining our result with multiwavelength data, we discuss the possible counterparts for HESS J1614−518 and consider radiation mechanisms based on hadronic and leptonic processes for a supernova remnant (SNR), stellar winds from massive stars, and a pulsar wind nebula (PWN). Although a leptonic origin from a PWN driven by an unknown pulsar remains possible, hadronic-origin emission from an unknown SNR is preferred.

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“…Each telescope has a 10-mφ reflector. Each reflector consists of 114 segmented spherical mirrors (80 cm in diameter with a radius of curvature of 16.4 m) made of FRP (Kawachi et al 2001) mounted on a parabolic frame ( f /d = 0.77, i.e., a focal length of 8 m). The total light collection area is 57.3 m 2 .…”

Section: Observationmentioning

confidence: 99%

Evidence of TeV gamma-ray emission from the nearby starburst galaxy NGC 253

Itoh

Enomoto²,

Yanagita

et al. 2006

A&A

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Aims. The CANGAROO-II telescope observed sub-TeV gamma-ray emission from the nearby starburst galaxy NGC 253. The emission region was extended with a radial size of 0.3-0.6 degree. On the contrary, HESS could not confirm this emission and gave upper limits at the level of the CANGAROO-II flux. In order to resolve this discrepancy, we analyzed new observational results for NGC 253 by CANGAROO-III and also assessed the results by CANGAROO-II. Methods. Observation was made with three telescopes of the CANGAROO-III in October 2004. We analyzed three-fold coincidence data by the robust Fisher Discriminant method to discriminate gamma ray events from hadron events. Results. The result by the CANGAROO-III was negative. The upper limit of gamma ray flux was 5.8% Crab at 0.58 TeV for pointsource assumption. In addition, the significance of the excess flux of gamma-rays by the CANGAROO-II was lowered to less than 4 sigma after assessing treatment of malfunction of photomultiplier tubes.

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The optical reflector system for the CANGAROO-II imaging atmospheric Cherenkov telescope

Cited by 46 publications

References 12 publications

Evidence of TeV gamma-ray emission from the nearby starburst galaxy NGC 253

Evidence of TeV gamma-ray emission from the nearby starburst galaxy NGC 253

CANGAROO-III OBSERVATION OF TeV GAMMA RAYS FROM THE UNIDENTIFIED GAMMA-RAY SOURCE HESS J1614–518

Evidence of TeV gamma-ray emission from the nearby starburst galaxy NGC 253

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