The Radio Parallax of the Crab Pulsar: A First VLBI Measurement Calibrated with Giant Pulses
Journal article, 2023

We use four observations with the European very long baseline interferometry (VLBI) network to measure the first precise radio parallax of the Crab Pulsar. We found two in-beam extragalactic sources just outside the Crab Nebula, with one bright enough to use as a background reference source in our data. We use the Crab Pulsar’s giant pulses to determine fringe and bandpass calibration solutions, which greatly improved the sensitivity and reliability of our images and allowed us to determine precise positional offsets between the pulsar and the background source. From those offsets, we determine a parallax of π = 0.53 ± 0.06 mas and proper motion of (μ α , μ δ ) = (−11.34 ± 0.06, 2.65 ± 0.14) mas yr−1, yielding a distance of d = 1.90 − 0.18 + 0.22 kpc and transverse velocity of v ⊥ = 104 − 11 + 13 km s − 1 . These results are consistent with the Gaia 3 measurements, and open up the possibility of far more accurate astrometry with further VLBI observations.

Author

Rebecca Lin

University of Toronto

Marten H. van Kerkwijk

University of Toronto

Franz Kirsten

Chalmers, Space, Earth and Environment, Onsala Space Observatory

U. L. Pen

University of Toronto

Canadian Institute for Theoretical Astrophysics

Canadian Institute for Advanced Research

Perimeter Institute for Theoretical Physics

Academia Sinica

A. Deller

ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)

Swinburne University of Technology

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 952 2 161

Onsala space observatory infrastructure

Swedish Research Council (VR) (2017-00648), 2018-01-01 -- 2021-12-31.

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.3847/1538-4357/acdc98

Related datasets

Radio Parallax of the Crab Pulsar Data Release [dataset]

DOI: 10.5281/zenodo.7910777

More information

Latest update

9/22/2023