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

Abstract

We present results of interferometric polarization observations of the recently discovered magnetar J1745-2900 in the vicinity of the Galactic center. The observations were made with the Karl G. Jansky Very Large Array (VLA) on 21 February 2014 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$\pm$0.31 mJy/beam and 1.5$\pm$0.2 mJy/beam, respectively. Analysis shows a rotation measure (RM) of (-67$\pm$3)x10${}^3$ rad/m${}^2$, which is in a good agreement with previous measurements at longer wavelengths. These high frequency observations are sensitive to RM values of up to ~2x10${}^7$ 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 center. The Faraday corrected intrinsic electric vector position angle is 16$\pm$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.

6 pages, 4 figures, accepted for publication in MNRAS; "Faraday synthesis" has been changed to "Faraday RM synthesis"/"RM synthesis"

References in corpus (10)

• Rotation Measures of Extragalactic Sources Behind the Southern Galactic Plane: New Insights into the Large-Scale Magnetic Field of the Inner Milky Way
• The Rotation Measure and 3.5mm Polarization of Sgr A*
• The Submillimeter Polarization of Sgr A*
• A strong magnetic field in the jet base of a supermassive black hole
• Simultaneous multifrequency radio observations of the Galactic Centre magnetar SGR J1745-2900
• Milky Way scattering properties and intrinsic sizes of active galactic nuclei cores probed by very long baseline interferometry surveys of compact extragalactic radio sources
• Probing the Parsec-scale Accretion Flow of 3C 84 with Millimeter Polarimetry
• Radio Continuum Emission from the Magnetar SGR J1745-2900: Interaction with Gas Orbiting Sgr A*
• PSR J1410-6132: A young, energetic pulsar associated with EGRET source 3EG J1410-6147
• Confronting the jet model of Sgr A* with the Faraday rotation measure observations

Cited by in corpus (4)

• Polarimetric properties of Event Horizon Telescope targets from ALMA
• The Scattering and Intrinsic Structure of Sagittarius A* at Radio Wavelengths
• Detection of the magnetar SGR J1745-2900 up to 291 GHz with evidence of polarized millimetre emission
• ALMA discovery of Punctum -- a highly polarized mm source in nuclear starburst galaxy NGC 4945