Pulsars as Barycenter Coordinate Clocks

Details Pulsars as Barycenter Coordinate Clocks Pulsars as Barycenter Coordinate Clocks

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..22i&link_type=abstract

Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200

Astronomy and Astrophysics

Astronomy

Scientific paper

Pulsars can be considered as very precise clocks if they were referred to the barycenter of the Solar system. Pulsar Timing Array (PTA) can be used to establish a new astronomical reference frame which is defined both space and time properties. Among these arrays most remarkable are the Parks Pulsar Timing Array- PPTA and Kalyazin Pulsar Timing Array - KPTA. The pulsar motion in space has to be taken into account. The pulsar proper motion is determined by a pulsar timing technique and transversal velocity is observed and measured by VLBI, as well. Radial velocity is impossible to measure because of the fact that there are no known spectral lines in pulsar spectra. The radial component of velocity of pulsar can not be determined by timing technique, as well, because of both radial velocity and radial acceleration are renormalized in pulsar period and its derivatives due to Doppler shift. The Shapiro time delay generated by the average gravitational field of our Galaxy affects the pulsar clocks, too. Stability of the set of pulsar clocks can be satisfactory while the mutual motion of a pulsar and the observer (referred to the barycenter of the Solar system) can be considered as linear. It is evident, that pulsars having large acceleration can be excluded from PTA, for instance, pulsars belonging to Globular clusters. That is why we have to know the relative acceleration pulsar versus observer. An attempt is made to estimate an influence of the proper Solar system motion with respect to the Galaxy barycenter (the local standard of rest), as well as pulsars motion. The first approach is being made in the presentation.

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