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Title:
Radio polarization measurements from RRAT J1819-1458
Authors:
Karastergiou, A.; Hotan, A. W.; van Straten, W.; McLaughlin, M. A.; Ord, S. M.
Affiliation:
AA(Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH), AB(Curtin Institute of Radio Astronomy, Curtin University of Technology, GPO Box U1987 Perth, Western Australia, 6845, Australia), AC(Swinburne University of Technology, Centre for Astrophysics and Supercomputing, Mail 31, PO Box 218, VIC 3122, Australia), AD(Department of Physics, West Virginia University, Morgantown, WV 26506, USA; National Radio Astronomy Observatory, Green Bank, WV 24944, USA), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 396, Issue 1, pp. L95-L99. (MNRAS Homepage)
Publication Date:
06/2009
Origin:
MNRAS
MNRAS Keywords:
polarization, pulsars: individual: J1819-1458
DOI:
10.1111/j.1745-3933.2009.00671.x
Bibliographic Code:
2009MNRAS.396L..95K

Abstract

We present the first polarization measurements of the radio emission from RRAT J1819-1458. Our observations, conducted in parallel to regular timing sessions, have yielded a small number of bright and polarized pulses. The polarization characteristics and integrated profile resemble those of normal pulsars with average spin-down energy : moderate to low linear polarization in the integrated profile despite relatively high polarization in the individual pulses. On average, a small degree of circular polarization is also observed. The polarization position angle (PA) executes a remarkably smooth, steep S-shaped curve, interrupted by two orthogonal jumps. Based on the shape of the PA swing, we place some constraints on the emission geometry. We compare these polarization properties to those of other radio-emitting neutron star populations, including young pulsars, pulsars with a high surface magnetic field and radio-emitting magnetars. From the polarization measurements, the Faraday rotation measure of this rotating radio transient is derived.
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