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SUMMARY:A High-Precision Annual Parallax Measurement Program for PTA Pulsa
 rs with VLBI
DTSTART;VALUE=DATE-TIME:20260708T073000Z
DTEND;VALUE=DATE-TIME:20260708T075000Z
DTSTAMP;VALUE=DATE-TIME:20261027T043335Z
UID:indico-contribution-810@indico.narit.or.th
DESCRIPTION:Speakers: Hideyuki Kobayashi (NARIT)\nRecent international PTA
  observations have provided compelling evidence for a primordial backgroun
 d gravitational wave\, bringing its direct detection within reach. In ligh
 t of this progress\, we are planning precise measurements of the annual pa
 rallaxes of PTA pulsars in order to identify the astrophysical sources res
 ponsible for the background gravitational waves.\nWhile the detection of t
 he background gravitational waves is being pursued through correlations in
  pulsar timing residuals\, identifying their astrophysical origins require
 s precise distance measurements to individual pulsars. Accurate pulsar dis
 tances enable the determination of the arrival directions of the backgroun
 d gravitational waves. The required accuracy corresponds to the gravitatio
 nal-wave wavelength scale\, on the order of several parsecs.\nTo achieve t
 his goal\, we plan high-precision astrometric VLBI observations at 1.4 G
 Hz (L band) and 320 MHz (P band). In particular\, VLBI observations usin
 g the Square Kilometre Array (SKA)\, currently under construction\, are ex
 pected to provide a significant improvement in sensitivity as well as subs
 tantial gains in phase-referencing accuracy through multi-beam observing c
 apabilities.\nIn this presentation\, we report an overview of the proposed
  observing strategy and the current status of preparation for these VLBI a
 strometric observations.\n\nhttps://indico.narit.or.th/event/236/contribut
 ions/810/
LOCATION:National Astronomical Research Institute of Thailand (NARIT) Andr
 omeda Meeting Room
URL:https://indico.narit.or.th/event/236/contributions/810/
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