Phase coherence for TeV/PeV binary sources

Details Phase coherence for TeV/PeV binary sources Phase coherence for TeV/PeV binary sources

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369..479l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 10, 1991, p. 479-484. Research supported by DOE and NSF.

Astronomy and Astrophysics

Astrophysics

8

Binary Stars, Cerenkov Radiation, Gamma Ray Bursts, Phase Coherence, Pulsars, Digital Simulation, Monte Carlo Method, Neutron Stars, Rayleigh Distribution, X Ray Stars

Scientific paper

There are reported detections of energetic gamma-rays from binary X-ray pulsars using the atmospheric Cerenkov technique or arrays of particle detectors. Because the observations are ground-based, the data consist of time segments up to about 4 hr in length, separated by one or more days. For several sources, detection is based upon analysis in which the signal coherence time was assumed to be at least a few days to several months. It is shown here that a frequency search with gapped data forces phase alignment of marginal signals (or noise) in the segments, allowing weak, incoherent signals (or excess noise) to appear as relatively strong coherent effects in a standard analysis. It is argued that long-term phase coherence has not been established for binary TeV/PeV sources, and a simple method by which it could be established is proposed.

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