Results on candidate UHE gamma-ray sources by the EAS-TOP array (1989-1993)

M. Aglietta, B. Alessandro, P. Antonioli, Francesco Arneodo, L. Bergamasco, A. Campos Fauth, C. Castagnoli, A. Castellina, A. Chiavassa, G. Cini, B. D'Ettorre Piazzoli, G. Di Sciascio, W. Fulgione, P. Galeotti, P. L. Ghia, M. Iacovacci, G. Mannocchi, C. Morello, G. Navarra, L. RiccatiO. Saavedra, G. C. Trinchero, P. Vallania, S. Vernetto

Research output: Contribution to journalArticle

Abstract

A search for UHE gamma-rays from 13 candidate point sources observable in the northern hemisphere (the Crab Nebula and Pulsar, Cygnus X-3, Hercules X-1, Geminga and others) has been performed by the EAS-TOP array during four years of operation since January 1989 to December 1993, at different energy thresholds (E0 = 30-300 TeV). DC, periodic and sporadic emissions have been studied, and no evidence for significant excesses has been found from any of these searches. The derived 90% c.l. upper limits to the d.c. flux, for a source culminating at the zenith such as Cygnus X-3, are Φ(E > 230 TeV) < 2 × 10-14 cm-2 s-1, Φ(E > 90 TeV) < 4.1 × 10-14 cm-2 s-1 and Φ(E > 25 TeV) < 1.9 × 10-13 cm-2 s-1. The excess from the Crab Nebula of February 23, 1989, as reported by the EAS-TOP, Baksan and KGF arrays, remains the only sporadic excess detected with statistically significant confidence level (probability of background imitation ≈ 10-5).

Original languageEnglish (US)
Pages (from-to)1-15
Number of pages15
JournalAstroparticle Physics
Volume3
Issue number1
DOIs
StatePublished - Jan 1 1995

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Crab nebula
zenith
Northern Hemisphere
pulsars
point sources
confidence
direct current
gamma rays
thresholds
energy

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Aglietta, M., Alessandro, B., Antonioli, P., Arneodo, F., Bergamasco, L., Campos Fauth, A., ... Vernetto, S. (1995). Results on candidate UHE gamma-ray sources by the EAS-TOP array (1989-1993). Astroparticle Physics, 3(1), 1-15. https://doi.org/10.1016/0927-6505(94)00026-Y

Results on candidate UHE gamma-ray sources by the EAS-TOP array (1989-1993). / Aglietta, M.; Alessandro, B.; Antonioli, P.; Arneodo, Francesco; Bergamasco, L.; Campos Fauth, A.; Castagnoli, C.; Castellina, A.; Chiavassa, A.; Cini, G.; D'Ettorre Piazzoli, B.; Di Sciascio, G.; Fulgione, W.; Galeotti, P.; Ghia, P. L.; Iacovacci, M.; Mannocchi, G.; Morello, C.; Navarra, G.; Riccati, L.; Saavedra, O.; Trinchero, G. C.; Vallania, P.; Vernetto, S.

In: Astroparticle Physics, Vol. 3, No. 1, 01.01.1995, p. 1-15.

Research output: Contribution to journalArticle

Aglietta, M, Alessandro, B, Antonioli, P, Arneodo, F, Bergamasco, L, Campos Fauth, A, Castagnoli, C, Castellina, A, Chiavassa, A, Cini, G, D'Ettorre Piazzoli, B, Di Sciascio, G, Fulgione, W, Galeotti, P, Ghia, PL, Iacovacci, M, Mannocchi, G, Morello, C, Navarra, G, Riccati, L, Saavedra, O, Trinchero, GC, Vallania, P & Vernetto, S 1995, 'Results on candidate UHE gamma-ray sources by the EAS-TOP array (1989-1993)', Astroparticle Physics, vol. 3, no. 1, pp. 1-15. https://doi.org/10.1016/0927-6505(94)00026-Y
Aglietta M, Alessandro B, Antonioli P, Arneodo F, Bergamasco L, Campos Fauth A et al. Results on candidate UHE gamma-ray sources by the EAS-TOP array (1989-1993). Astroparticle Physics. 1995 Jan 1;3(1):1-15. https://doi.org/10.1016/0927-6505(94)00026-Y
Aglietta, M. ; Alessandro, B. ; Antonioli, P. ; Arneodo, Francesco ; Bergamasco, L. ; Campos Fauth, A. ; Castagnoli, C. ; Castellina, A. ; Chiavassa, A. ; Cini, G. ; D'Ettorre Piazzoli, B. ; Di Sciascio, G. ; Fulgione, W. ; Galeotti, P. ; Ghia, P. L. ; Iacovacci, M. ; Mannocchi, G. ; Morello, C. ; Navarra, G. ; Riccati, L. ; Saavedra, O. ; Trinchero, G. C. ; Vallania, P. ; Vernetto, S. / Results on candidate UHE gamma-ray sources by the EAS-TOP array (1989-1993). In: Astroparticle Physics. 1995 ; Vol. 3, No. 1. pp. 1-15.
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AU - Arneodo, Francesco

AU - Bergamasco, L.

AU - Campos Fauth, A.

AU - Castagnoli, C.

AU - Castellina, A.

AU - Chiavassa, A.

AU - Cini, G.

AU - D'Ettorre Piazzoli, B.

AU - Di Sciascio, G.

AU - Fulgione, W.

AU - Galeotti, P.

AU - Ghia, P. L.

AU - Iacovacci, M.

AU - Mannocchi, G.

AU - Morello, C.

AU - Navarra, G.

AU - Riccati, L.

AU - Saavedra, O.

AU - Trinchero, G. C.

AU - Vallania, P.

AU - Vernetto, S.

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