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Titolo:
RESULTS ON CANDIDATE UHE GAMMA-RAY SOURCES BY THE EAS-TOP ARRAY (1989-1993)
Autore:
AGLIETTA M; ALESSANDRO B; ANTONIOLI P; ARNEODO F; BERGAMASCO L; FAUTH AC; CASTAGNOLI C; CASTELLINA A; CHIAVASSA A; CINI G; PIAZZOLI BD; DISCIASCIO 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;
Indirizzi:
IST NAZL FIS NUCL,SEZ TORINO,VIA PIETRO GIURIA 1 I-10125 TURIN ITALY IST NAZL FIS NUCL,SEZ TORINO I-10125 TURIN ITALY UNIV TURIN,IST FIS I-10125 TURIN ITALY CNR,IST COSMOGEOFIS I-10133 TURIN ITALY UNIV AQUILA,DIPARTIMENTO FIS I-67010 COPPITO ITALY UNIV ESTADUAL CAMPINAS,INST FIS BR-13081 CAMPINAS BRAZIL UNIV NAPLES,DIPARTIMENTO SCI FISICHE I-80125 NAPLES ITALY IST NAZL FIS NUCL I-80125 NAPLES ITALY
Titolo Testata:
Astroparticle physics
fascicolo: 1, volume: 3, anno: 1995,
pagine: 1 - 15
SICI:
0927-6505(1995)3:1<1:ROCUGS>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRAB-NEBULA; TEV; CYGNUS-X-3; GEMINGA; SEARCH; EMISSION; BURST; HERCULES-X-1; RADIATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
M. Aglietta et al., "RESULTS ON CANDIDATE UHE GAMMA-RAY SOURCES BY THE EAS-TOP ARRAY (1989-1993)", Astroparticle physics, 3(1), 1995, pp. 1-15

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 (E(0) = 30-300 TeV). DC, periodic andsporadic emissions have been studied, and no evidence for significantexcesses 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 Phi(E > 230 TeV) < 2 x 10(-14) cm(-2) s(-1), Phi(E > 90 TeV) < 4.1 x 10(-14) cm(-2) s(-1) and Phi(E > 25 TeV) < 1.9 x 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, remainsthe only sporadic excess detected with statistically significant confidence level (probability of background imitation approximate to 10(-5)).

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Documento generato il 30/11/20 alle ore 19:41:39