A millisecond pulsar timing array

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Stellar, Galactic, Parkes

Scientific paper

The Parkes Pulsar Timing Array (PPTA) project has three primary goals: (a) detection of gravitational waves from astronomical sources, (b) establishment of a pulsar timescale, and (c) improvement of our understanding of Solar-system dynamics. There are many secondary goals, some astrophysical and some instrumental/technique oriented. Achievement of these ambitious primary goals requires frequent observations of at least 20 MSPs at two or preferably three widely spaced frequencies over several years. We wish to continue observing the PPTA sample at intervals of 2-3 weeks using both the 10/50cm and Multibeam receivers. The digital filterbanks (PDFB2, PDFB3) and the baseband systems (CPSR2; APSR soon) are used for data recording. With the new instruments and development of an efficient pipeline processing system, we are getting the world's best pulsar timing precision, with four pulsars having rms residuals of less than 200 ns and more than half less than 1 microsecond. We are collaborating with the European and North American pulsar timing array groups (EPTA and NANOGrav, respectively) to obtain more frequent observations and a larger pulsar sample. Because of the high sensitivity and wide bandwidths required, RFI mitigation is an important part of the project.

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