Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..691c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 2, p. 691-696.
Astronomy and Astrophysics
Astrophysics
11
Interstellar Matter, Pulsars, Refraction, Stellar Spectrophotometry, Discontinuity, Gravitational Lenses, Light Curve
Scientific paper
Sharp discontinuities, characterized by changes in the diffractive scintillation pattern over transition times of less than 2 minutes, are seen in the 1400 MHz dynamic spectrum of the pulsar 0823+26. The discontinuities occur while the pulsar's broad-band light curve is undergoing strong 15 min oscillations. These effects appear to be caused by coherent interference between multiple images created by strong refraction in the interstellar medium. The discontinuities in the dynamic spectrum are observed when the scintillation patterns of different images (each traveling different optical paths) alternately dominate the received intensity. Coherent interference between the various images over bandwidths greater than the observing bandwidth causes the light curve oscillations. The pulsar 0823+26, which appears to undergo extended periods of multiple imaging, may be a suitable candidate for interstellar interferometry.
Clegg Andrew W.
Cordes James M.
Fiedler Ralph L.
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