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A search for 100 TeV gamma-ray emission from the x-ray binary pulsar 4U 0115+63 using the CYGNUS extensive air-shower array

Technical Report ·
OSTI ID:7135259
A search has been performed for unpulsed and pulsed Ultra-High-Energy gamma-ray emission from the X-ray transient binary pulsar 4U 0115+63 over timescales ranging from one source-day to the entire data set. The motivation has been the detection at TeV energies of 4U 0115+63 by the Cerenkov telescope at Dugway, operated by the University Durham. The search has been performed in the database of the CYGNUS I extensive air-shower array that extends from April 1986 to March 1992, and contains 17,000 hours of data from the source direction. In the search for unpulsed emission, the background is estimated by creating random events from the actually detected data-set, and the Li Ma statistic is used to evaluate the statistical significance of a background fluctuation. The Rayleigh test and its power are employed in the search for pulsed emission. No statistically significant evidence for emission can be found. No correlation with its 24-day orbital period can be seen. A 90% confidence-level upper limit on the unpulsed continuous flux from 4U 0115+63 above 130 TeV is 7.0 [times] 10[sup [minus]15] cm[sup [minus]2] s[sup [minus]1]. This value agrees with that of the Whipple collaboration but is at least one order of magnitude lower than other upper limits or claimed detections.
Research Organization:
Los Alamos National Lab., NM (United States)
Sponsoring Organization:
DOE; USDOE, Washington, DC (United States)
DOE Contract Number:
W-7405-ENG-36
OSTI ID:
7135259
Report Number(s):
LA-12427-T; ON: DE93004129
Country of Publication:
United States
Language:
English

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Related Subjects

440104 -- Radiation Instrumentation-- High Energy Physics Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
661300* -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BINARY STARS
CHARGED PARTICLE DETECTION
COSMIC GAMMA BURSTS
COSMIC RADIATION
COSMIC RADIO SOURCES
DETECTION
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MUON DETECTION
PRIMARY COSMIC RADIATION
PULSARS
RADIATION DETECTION
RADIATION DETECTORS
RADIATIONS
SCINTILLATION COUNTERS
SHOWER COUNTERS
STARS