Upper limits on TeV gamma-ray emission from Centaurus A, Vela X-1, Centaurus X-3, and Circinus X-1

Allen, William H.; Bond, I. A.; Budding, E.; Conway, M. J.; Daniel, A.; Fenton, K. B.; Fujii, Hirofumi; Fujii, Z.; Hayashida, N.; Hibino, K.; Honda, Mitsuhiko; Humble, J. E.; Kabe, S.; Kasahara, K.; Kifune, T.; Lythe, Grant; Masaike, A.; Matsubara, Y.; Mitsui, K.; Miura, Yoshio; Mori, M.; Muraki, Y.; Nagano, M.; Nakamura, Takashi; Nakamura, Masaki; Norris, P. M.; Ogio, S.; Saito, T.; Sakata, M.; Sato, H.; Shimizu, Hideyuki; Spencer, M.; Storey, J. R.; Tanimori, T.; Teshima, M.; Torii, S.; Wadsworth, A.; Watase, Y.; Woodhams, Michael D.; Yamamoto, Y.; Yock, P. C. M.; Yuda, T.

doi:10.1086/172386

Cited by 14 publications

(14 citation statements)

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“…The systemic velocity of NGC 5128 is most frequently derived from measurements of components of the disk (Sect. 4). An overview of estimates up to 1984 can be found in Hesser et al (1984); Table 1 lists all estimates a. later than 1975; b. having a quoted accuracy of 10 km s −1 or better; and c. not based on HI or molecular line absorption (see Sect .…”

Section: Systemic Velocitymentioning

confidence: 99%

Centaurus A - NGC 5128

Israel

1998

Astronomy and Astrophysics Review

317

309

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This review summarizes the state of the knowledge of the nearby (D = 3.4 Mpc) radio source Centaurus A and its host galaxy NGC 5128. The massive elliptical host galaxy appears to be moderately triaxial. It contains a strongly warped thin disk, rich in gas, dust and young stars, and roughly aligned with the minor axis of the elliptical galaxy. This and other evidence suggests that NGC 5128 has experienced a major merger at least once in its past. The subparsec nucleus is variable at radio and X-ray wavelengths and is probably powered by accretion onto a black hole of moderate mass. HI and molecular line absorption against the nucleus suggest significal inflow of material. Linear radio/X-ray jets emanating from the nucleus become subrelativistic at a few parsec, expand into plumes at about 5 kpc, and then turn into huge radio lobes extending out to 250 kpc. A compact disk surrounds the nucleus. It is not aligned with any of the principal axes of the elliptical galaxy, but perpendicular to the inner jets. The jet-collimating mechanism, probably tied to this circumnuclear disk, appears to be precessing on timescales of a times 10**7 yerars.Comment: Reviw; 46 pages; Figures not include

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Section: Systemic Velocitymentioning

confidence: 99%

Centaurus A - NGC 5128

Israel

1998

Astronomy and Astrophysics Review

317

309

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“…The first results of high energy photon detection from Cen A were reported by Grindlay et al [3]. Later Buckland Park array [4] and the JANSOZ observatory [5,6] measured the gamma ray flux near 100 TeV from this source. CANGAROO-I [7], JANZOS [5,6] and Durham [8] observed the nuclear region of Cen A and set upper limits on the emission of very high energy photons from this region.…”

Section: Introductionmentioning

confidence: 91%

“…The JANSOZ array reported a search for gamma ray emission from Cen A over the period of October 1987 to January 1992 [5,6]. No evidence was found for a steady flux but a period of 48 days in 1990 showed a flux excess of 3.8σ.…”

Section: Correlating γ-Ray and Cosmic Ray Emissionmentioning

confidence: 99%

“…Later Buckland Park array [4] and the JANSOZ observatory [5,6] measured the gamma ray flux near 100 TeV from this source. CANGAROO-I [7], JANZOS [5,6] and Durham [8] observed the nuclear region of Cen A and set upper limits on the emission of very high energy photons from this region. The HESS group [9] observed Cen A for a few hours in 2004 and put an upper limit on the gamma ray flux above 190 GeV.…”

Section: Introductionmentioning

confidence: 99%

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Study of photoinduced absorption by the method of modified laser photothermal radiometry

Skvortsov¹,

Maksimov²,

Tuchkov³

2008

Quantum Electron.

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Centaurus A, the cosmic ray accelerator a few Mpc away from us, is possibly one of the nearest sources of extremely high energy cosmic rays. We investigate whether the gamma ray data currently available from Centaurus A in the GeV-TeV energy band can be explained with only proton-proton interactions. We show that for a single power law proton spectrum, mechanisms of γ-ray production other than proton-proton interactions are needed inside this radio-galaxy to explain the gamma ray flux observed by EGRET, upper limits from HESS/CANGAROO-III and the correlated extremely energetic cosmic ray events observed by the Pierre Auger experiment. In future, with better γ-ray data, and simultaneous observation with γ-ray and cosmic ray detectors, it will be possible to carry out such studies on different sources in more detail.

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“…The JANZOS group observed Cen A from New Zealand for 56.9 h between April 1988 and June 1989, reporting a 95% confidence level upper limit on the flux above 1 TeV of 2.2 Â 10 À11 cm À2 s À1 (Allen et al 1993a).…”

Section: Searches At Tev Energiesmentioning

confidence: 99%

Centaurus A at Ultra-High Energies

Clay

Whelan

Edwards

2010

Publ. – Astron. Soc. Aust

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Abstract:We review the importance of Centaurus A in high-energy astrophysics as a nearby object with many of the properties expected of a major source of very high-energy cosmic rays and gamma rays. We examine observational techniques and the results so far obtained in the energy range from 200 GeV to above 100 EeV and attempt to fit those data to expectations of Centaurus A as an astrophysical source from very high to ultra-high energies.

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Upper limits on TeV gamma-ray emission from Centaurus A, Vela X-1, Centaurus X-3, and Circinus X-1

Cited by 14 publications

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Centaurus A - NGC 5128

Centaurus A - NGC 5128

Study of photoinduced absorption by the method of modified laser photothermal radiometry

Centaurus A at Ultra-High Energies

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