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Oxford University Press, Monthly Notices of the Royal Astronomical Society, 2(518), p. 1642-1655, 2022

DOI: 10.1093/mnras/stac3248

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A MeerKAT look at the polarization of 47 Tucanae pulsars: magnetic field implications

Journal article published in 2022 by F. Abbate ORCID, A. Possenti, A. Ridolfi ORCID, V. Venkatraman Krishnan, S. Buchner ORCID, E. D. Barr ORCID, M. Bailes, M. Kramer ORCID, A. Cameron ORCID, A. Parthasarathy, W. van Straten ORCID, W. Chen ORCID, F. Camilo, P. V. Padmanabh ORCID, S. A. Mao ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

ABSTRACT We present the polarization profiles of 22 pulsars in the globular cluster 47 Tucanae using observations from the MeerKAT radio telescope at UHF band (544–1088 MHz) and report precise values of dispersion measure (DM) and rotation measure (RM). We use these measurements to investigate the presence of turbulence in electron density and magnetic fields. The structure function of DM shows a break at ∼30 arcsec (∼0.6 pc at the distance of 47 Tucanae) that suggests the presence of turbulence in the gas in the cluster driven by the motion of wind-shedding stars. On the other hand, the structure function of RM does not show evidence of a break. This non-detection could be explained either by the limited number of pulsars or by the effects of the intervening gas in the Galaxy along the line of sight. Future pulsar discoveries in the cluster could help confirm the presence and localize the turbulence.