Reduction of Interstellar Medium Scattering Effects in Millisecond Pulsar Timing

Details Reduction of Interstellar Medium Scattering Effects in Millisecond Pulsar Timing Reduction of Interstellar Medium Scattering Effects in Millisecond Pulsar Timing

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545324l&link_type=abstract

American Astronomical Society, AAS Meeting #215, #453.24; Bulletin of the American Astronomical Society, Vol. 42, p.466

Astronomy and Astrophysics

Astronomy

Scientific paper

While millisecond pulsar (MSP) timing has improved over time, the precision of timing measurements will become limited by the interstellar medium (ISM) in a way analogous to diffraction-limited seeing due to the atmosphere. MSPs are used as astronomical clocks to perform physical tests, such as in testing the Theory of General Relativity. We can directly detect gravitational wave radiation as predicted by Einstein and indirectly detected by Hulse and Taylor in 1974 as it passes through pulses traveling through the ISM and delays their times of arrival. In order to observe these delays, we must lower present noise levels of timing measurements 1-2 orders of magnitude. Using data taken simultaneously at Arecibo Observatory and the Robert C. Byrd Green Bank Telescope, we looked at methods for reducing the timing residuals in measurements taken of the pulsars 1937+21 and 1713+07 in L and S bands. We analyzed flux density with respect to observation time and frequency and used several techniques to obtain scattering time delays. We then looked for correlations between data sets to account for the noise contributions due to the interstellar medium. We report our results and demonstrate how these methods can be used in future measurements of MSP timing. We thankfully acknowledge Colgate University and the National Radio Astronomy Observatory for funding this poster.

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