The MSPSRπ catalogue: VLBA astrometry of 18 millisecond pulsars
Abstract
With unparalleled rotational stability, millisecond pulsars (MSPs) serve as ideal laboratories for numerous astrophysical studies, many of which require precise knowledge of the distance and/or velocity of the MSP. Here, we present the astrometric results for 18 MSPs of the 'MSPSR$\pi$' project focusing exclusively on astrometry of MSPs, which includes the reanalysis of three previously published sources. On top of a standardized data reduction protocol, more complex strategies (i.e. normal and inversereferenced 1D interpolation) were employed where possible to further improve astrometric precision. We derived astrometric parameters using sterne, a new Bayesian astrometry inference package that allows the incorporation of prior information based on pulsar timing where applicable. We measured significant (${>}3\, \sigma$) parallaxbased distances for 15 MSPs, including 0.81 ± 0.02 kpc for PSR J1518+4904  the most significant modelindependent distance ever measured for a double neutron star system. For each MSP with a wellconstrained distance, we estimated its transverse space velocity and radial acceleration. Among the estimated radial accelerations, the updated ones of PSR J1012+5307 and PSR J1738+0333 impose new constraints on dipole gravitational radiation and the time derivative of Newton's gravitational constant. Additionally, significant angular broadening was detected for PSR J16431224, which offers an independent check of the postulated association between the HII region Sh 227 and the main scattering screen of PSR J16431224. Finally, the upper limit of the death line of γrayemitting pulsars is refined with the new radial acceleration of the hitherto least energetic γray pulsar PSR J17302304.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 March 2023
 DOI:
 10.1093/mnras/stac3725
 arXiv:
 arXiv:2212.06351
 Bibcode:
 2023MNRAS.519.4982D
 Keywords:

 gravitation;
 stars: kinematics and dynamics;
 pulsars: individual: PSR J0030+0451;
 PSR J06102100;
 PSR J0621+1002;
 PSR J10240719;
 PSR J1537+1155;
 PSR J1853+1303;
 PSR J1910+1256;
 PSR J19180642;
 PSR J1939+2134;
 gammarays: stars;
 radio continuum: stars;
 Astrophysics  High Energy Astrophysical Phenomena;
 General Relativity and Quantum Cosmology
 EPrint:
 23 pages, 6 figures, 10 tables, published in MNRAS