Refraction in Pulsar Dynamic Spectra

Details Refraction in Pulsar Dynamic Spectra Refraction in Pulsar Dynamic Spectra

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5210s&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #52.10; Bulletin of the American Astronomical Society, Vol. 31, p.904

Astronomy and Astrophysics

Astronomy

Scientific paper

We have analyzed a uniform set of pulsar dynamic spectra obtained at the NRAO 43-m telescope. The observations were made at both 800 MHz and 1330 MHz at 5 epochs spaced over 2 years. We performed a power spectrum analysis on the dynamic spectra in order to identify and quantify the amount of refraction in the observation. We have developed a ``refraction measure'' that compares the power away from the origin in the power spectrum plane with the power in the diffractive feature at the origin. By quantifying the refractive power we can estimate the frequency of occurrence of episodes of mild to strong refractive effects in the data. The ultimate goal of this work is to connect the frequency of occurrence of these phenomena with the space density of refracting structures in the interstellar medium. This research was supported by the National Science Foundation through grant AST-9619493 and through its support of the National Radio Astronomy Observatory.

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