Aims of the PPTA project
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The PPTA data-sets allow (or will allow) us to study a wide variety of physical problems. Such problems range from looking for irregularities in terrestrial time standards to studying the early Universe. Our data-sets currently consist of approximately 2.5 years of timing observations of 20 millisecond pulsars. For each pulsar we record pulse times-of-arrival (TOAs) approximately once every two weeks at three observing frequencies (10, 20 and 50cm). A dual-band receiver allows us to observe at 10cm and 50cm simultaneously. We use standard pulsar timing techniques to obtain pulsar timing residuals from the TOAs using estimated astrometric, rotational, dispersion and binary parameters for each pulsar. The rms timing residuals for our pulsars currently lie between 100ns and 1us. The aim of the PPTA project is to obtain 5 year data-sets for 20 pulsars with the rms timing residuals for 10 pulsars close to 100ns and the remainder ~500ns.
We expect that the data-sets will allow us to: