Polarization studies of rotating radio transients

Author:

Caleb M123,van Straten W34ORCID,Keane E F35ORCID,Jameson A36,Bailes M36,Barr E D37,Flynn C3,Ilie C D1ORCID,Petroff E38ORCID,Rogers A4,Stappers B W1,Venkatraman Krishnan V37ORCID,Weltevrede P1

Affiliation:

1. University of Manchester, Jodrell Bank Centre of Astrophysics, Alan Turing Building, Manchester M13 9PL, UK

2. Research School of Astronomy and Astrophysics, Australian National University, ACT, 2611, Australia

3. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia

4. Institute for Radio Astronomy & Space Research, Auckland University of Technology, Private Bag 92006, Auckland 1142, New Zealand

5. SKA Organisation, Jodrell Bank Observatory, SK11 9DL, UK

6. OzGrav, Centre for Astrophysics and Supercomputing, Swinburne University of Technology, H11 PO Box 218 Hawthorn, Vic, 3122, Australia

7. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

8. Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, NL-1098 XH Amsterdam, the Netherlands

Abstract

ABSTRACT We study the polarization properties of 22 known rotating radio transients (RRATs) with the 64-m Parkes radio telescope and present the Faraday rotation measures (RMs) for the 17 with linearly polarized flux exceeding the off-pulse noise by 3σ. Each RM was estimated using a brute-force search over trial RMs that spanned the maximum measurable range $\pm 1.18 \times 10^5 \, \mathrm{rad \, m^2}$ (in steps of 1 $\mathrm{rad \, m^2}$), followed by an iterative refinement algorithm. The measured RRAT RMs are in the range |RM| 1–950 rad m−2 with an average linear polarization fraction of 40 per cent. Individual single pulses are observed to be up to 100 per cent linearly polarized. The RMs of the RRATs and the corresponding inferred average magnetic fields (parallel to the line of sight and weighted by the free electron density) are observed to be consistent with the Galactic plane pulsar population. Faraday rotation analyses are typically performed on accumulated pulsar data, for which hundreds to thousands of pulses have been integrated, rather than on individual pulses. Therefore, we verified the iterative refinement algorithm by performing Monte Carlo simulations of artificial single pulses over a wide range of S/N and RM. At and above an S/N of 17 in linearly polarized flux, the iterative refinement recovers the simulated RM value 100 per cent of the time with a typical mean uncertainty of 5 rad m−2. The method described and validated here has also been successfully used to determine reliable RMs of several fast radio bursts (FRBs) discovered at Parkes.

Funder

European Research Council

Horizon 2020

Australian Research Council

Swinburne University of Technology

Jet Propulsion Laboratory

California Institute of Technology

National Aeronautics and Space Administration

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 10 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. RRAT J1913+1330: An Extremely Variable and Puzzling Pulsar;The Astrophysical Journal;2024-08-26

2. Polarized radio emission of RRAT J1854+0306;Monthly Notices of the Royal Astronomical Society;2024-04-13

3. Deep Synoptic Array Science: Polarimetry of 25 New Fast Radio Bursts Provides Insights into Their Origins;The Astrophysical Journal;2024-03-26

4. Polarization and single-pulse micro-structure studies of Rotating Radio Transient J0139+3336 with FAST;Monthly Notices of the Royal Astronomical Society;2024-01-08

5. Studying the radiation characteristics of rotating radio transient J1913 + 1330 with FAST;Monthly Notices of the Royal Astronomical Society;2023-11-07

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