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Showing papers by "Jim Napolitano published in 1989"

Book Chapter•DOI•
Ultra High Energy Radiation from Hercules X-l; New Physics Above 100 TEV ?

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G. B. Yodh1, Brenda Dingus2, J. A. Goodman2, D. A. Krakauer2, C. Y. Chang2, R. L. Talaga2, Todd Haines2, D. E. Alexandreas2, R. W. Ellsworth3, R. L. Burman4, K. B. Butterfield4, R. Cady4, R. C. Carlini4, J. Lloyd-Evans4, D. E. Nagle4, V. D. Sandberg4, C.A. Wilkinson4, M. Potter4, R. C. Allen1, S. J. Freedman5, Jim Napolitano5, B. K. Fujikawa6 •
University of California, Irvine1, University of Maryland, College Park2, George Mason University3, Los Alamos National Laboratory4, Argonne National Laboratory5, California Institute of Technology6
01 Jan 1989
TL;DR: In this article, an observation of episodic emissions from Her X-1 in 1986 is described, showing a periodicity of 1.2357±0.0003sec with a statistical significance of 2 ×10-5.
Abstract: Recent results on study of ultra high energy radiation from astrophysical compact objects using the CYGNUS* array at Los Alamos are presented. Observation of episodic emissions from Her X-1 in 1986 are described. Two bursts of radiation on UT July 24 1986 were detected showing a periodicity of 1.2357±0.0003sec with a statistical significance of ~ 2 ×10-5. The showers were found to have a muon content similar to that for hadronic showers and the energy of their progenitors were greater than 400 TeV. The characteristic muon poor feature of similar gamma ray initiated showers was not observed for the signal.

1 citations