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

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

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aph.....3....1a&link_type=abstract

ASTROPARTICLE PHYSICS, Volume 3, Issue 1, p. 1-15.

Physics

19

Scientific paper

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 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 Phi(E>230 TeV)<2x10^-14 cm^-2 s^-1, Phi(E>90 TeV)<4.1x10^-14 cm^-2 s^-1 and Phi(E>25 TeV)<1.9x10^-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).

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