The MSPSR$π$ catalogue: VLBA astrometry of 18 millisecond pulsars
| Autor: | Ding, H., Deller, A. T., Stappers, B. W., Lazio, T. J. W., Kaplan, D., Chatterjee, S., Brisken, W., Cordes, J., Freire, P. C. C., Fonseca, E., Stairs, I., Guillemot, L., Lyne, A., Cognard, I., Reardon, D. J., Theureau, G. |
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| Rok vydání: | 2022 |
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| DOI: | 10.48550/arxiv.2212.06351 |
| Popis: | 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$π$" project focusing exclusively on astrometry of MSPs, which includes the re-analysis of 3 previously published sources. On top of a standardized data reduction protocol, more complex strategies (i.e., normal and inverse-referenced 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 ($>3\,σ$) parallax-based distances for 15 MSPs, including $0.81\pm0.02\,$kpc for PSR J1518+4904 -- the most significant model-independent distance ever measured for a double neutron star system. For each MSP with a well-constrained 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 J1643-1224, which offers an independent check of the postulated association between the HII region Sh 2-27 and the main scattering screen of PSR J1643-1224. Finally, the upper limit of the death line of $γ$-ray-emitting pulsars is refined with the new radial acceleration of the hitherto least energetic $γ$-ray pulsar PSR J1730-2304. 23 pages, 6 figures, 10 tables, published in MNRAS |
| Databáze: | OpenAIRE |
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