Authors: R. Smits, S.J. Tingay, N. Wex, M. Kramer, B. Stappers
Date: 31 Jan 2011
Abstract: Parallax measurements of pulsars allow for accurate measurements of the interstellar electron density and contribute to accurate tests of general relativity using binary systems. The Square Kilometre Array (SKA) will be an ideal instrument for measuring the parallax of pulsars, having a very high sensitivity as well as baselines extending up to several thousands of kilometres. We have performed simulations to estimate the number of pulsars for which the parallax can be measured with the SKA and to what distance a parallax can be measured. We compare two different methods. The first method measures the parallax directly by utilising the long baselines of the SKA to form high angular resolution images. The second method uses the arrival times of the radio signals of pulsars to fit a transformation between time coordinates in the terrestrial frame and the comoving pulsar frame which directly yields the parallax. We find that with the first method a parallax with an accuracy of 20% or less can be measured up to a maximum distance of 13 kpc, which would include 9,000 pulsars. By timing pulsars with the most stable arrival times for the radio emission, parallaxes can be measured for about 3,600 millisecond pulsars up to a distance of 9 kpc with an accuracy of 20%.
© M. Vallisneri 2012 — last modified on 2010/01/29
Tantum in modicis, quantum in maximis