A. Kirichenko1, Yu. Shibanov1, P. Shternin1, S. Johnston2, M. A. Voronkov2, A. Danilenko1, D. Barsukov1, D. Lai,3 D. Zyuzin1
PSR J1357−6429 is a young and energetic radio pulsar detected in X-rays and gamma-rays. It powers a compact pulsar wind nebula with a jet visible in X-rays and a large scale plerion detected in the radio, X-ray and TeV ranges. Previous multiwavelength studies suggested that the pulsar has a significant proper motion of about 180 mas/yr implying an extremely high transverse velocity of about 2000 km/s. In order to verify that, we performed radio-interferometric observations of PSR J1357−6429 with the Australia Telescope Compact Array in the 2.1 GHz band. We detected the pulsar with a mean flux density of 212 ± 5 μJy and obtained the most accurate pulsar position, RA = 13:57:02.525(14) and Dec = −64:29:29.89(15). Using the new and archival ATCA data, we did not find any proper motion and estimated its 90 per cent upper limit |μ|<100 mas/yr. The pulsar shows a highly polarised single pulse, as it was earlier observed at 1.4 GHz. Spectral analysis revealed a shallow spectral index αν = 0.5 ± 0.1. Based on our new radio position of the pulsar, we disclaim its optical counterpart candidate reported before.
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