Rotation measure synthesis study and polarized properties of PSR J1745-2900 at 7 mm

E. V. Kravchenko*, W. D. Cotton, F. Yusef-Zadeh, Y. Y. Kovalev

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We present results of interferometric polarization observations of the recently discovered magnetar J1745-2900 in the vicinity of the Galactic Centre. The observations were made with the Karl G. Jansky Very Large Array (VLA) on 2014 February 21 in the range 40-48 GHz. The full polarization mode and A configuration of the array were used. The average total and linearly polarized flux density of the pulsar amounts to 2.3 ± 0.31 and 1.5 ± 0.2 mJy beam-1, respectively. Analysis shows a rotation measure (RM) of (-67 ± 3) × 103 rad m-2, which is in good agreement with previous measurements at longer wavelengths. These high-frequency observations are sensitive to RM values of up to ~2 × 107 rad m-2. However, application of the Faraday RM synthesis technique did not reveal other significant RM components in the pulsar emission. This supports an external nature of a single thin Faraday-rotating screen which should be located close to the Galactic Centre. The Faraday-corrected intrinsic electric vector position angle is 16 ± 9 deg east of north, and coincides with the position angle of the pulsar's transverse velocity. All measurements of the pulsar's RM value to date, including the one presented here, well agree within errors, which points towards a steady nature of the Faraday-rotating medium.

Original languageEnglish (US)
Pages (from-to)4456-4461
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Mar 17 2016


  • Galaxy: Centre
  • Polarization
  • Pulsars: Individual: PSR J1745-2900
  • Stars: Magnetars
  • Techniques: Interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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