VLBI astrometry of two millisecond pulsars

Abstract

We present astrometric results on two millisecond pulsars, PSR B1257+12 and PSR J1022+1001, as carried out through VLBI. For PSR B1257+12, a model-independent distance of $710_{-38}^{+43}$ pc and proper motion of (${\mu }_{\alpha }=46.44\pm 0.08$ mas/yr, ${\mu }_{\delta }=-84.87\pm 0.32$ mas/yr) were obtained from 5 epochs of VLBA and 4 epochs of EVN observations, spanning about 2 years. The two dimensional proper motion of PSR J1022+1001 (${\mu }_{\alpha }\sim -10.13$ mas/yr, ${\mu }_{\delta }\sim 16.89$ mas/yr) was also estimated, using 3 epochs of EVN observations. Based on our results, the X-ray efficiency of PSR B1257+12 should be in the same range as other millisecond pulsars, and not as low as previously thought.

arXiv commentProceedings of IAUS 291 "Neutron Stars and Pulsars: Challenges and Opportunities after 80 years", J. van Leeuwen (ed.); 3 pages

References in corpus (9)

• DiFX: A software correlator for very long baseline interferometry using multi-processor computing environments
• VLBA Measurement of Nine Pulsar Parallaxes
• Precision Astrometry with the Very Long Baseline Array: Parallaxes and Proper Motions for 14 Pulsars
• Masses and orbital inclinations of planets in the PSR B1257+12 system
• Profile instabilities of the millisecond pulsar PSR J1022+1001
• Sub-Milliarcsecond Precision of Pulsar Motions: Using In-Beam Calibrators with the VLBA
• PSR J1022+1001: Profile Stability & Precision Timing
• X-ray emission from the planet pulsar B1257+12
• Precision Southern Hemisphere pulsar VLBI astrometry: techniques and results for PSR J1559-4438