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Radio emission evolution, polarimetry and multifrequency single pulse analysis of the radio magnetar PSR J1622−4950

Levin, L. and Bailes, M. and Bates, S. D. and Bhat, N. D. R. and Burgay, M. and Burke-Spolaor, S. and D'Amico, N. and Johnston, S. and Keith, M. J. and Kramer, M. and Milia, S. and Possenti, A. and Stappers, B. and van Straten, W. (2012) Radio emission evolution, polarimetry and multifrequency single pulse analysis of the radio magnetar PSR J1622−4950. Monthly Notices of the Royal Astronomical Society, 422 (3). pp. 2489-2500. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20130214-090248214

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Abstract

Here we report on observations of the radio magnetar PSR J1622−4950 at frequencies from 1.4 to 17 GHz. We show that although its flux density is varying up to a factor of ∼10 within a few days, it has on average decreased by a factor of 2 over the last 700 days. At the same time, timing analysis indicates a trend of decreasing spin-down rate over our entire data set, again of about a factor of 2 over 700 days, but also an erratic variability in the spin-down rate within this time span. Integrated pulse profiles are often close to 100 per cent linearly polarized, but large variations in both the profile shape and fractional polarization are regularly observed. Furthermore, the behaviour of the position angle of the linear polarization is very complex – offsets in both the absolute position angle and the phase of the position angle sweep are often seen and the occasional presence of orthogonal mode jumps further complicates the picture. However, model fitting indicates that the magnetic and rotation axes are close to aligned. Finally, a single pulse analysis has been carried out at four observing frequencies, demonstrating that the wide pulse profile is built up of narrow spikes of emission, with widths that scale inversely with observing frequency. All three of the known radio magnetars seem to have similar characteristics, with highly polarized emission, time-variable flux density and pulse profiles, and with spectral indices close to zero.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1111/j.1365-2966.2012.20807.xDOIArticle
https://arxiv.org/abs/1204.2045arXivDiscussion Paper
Additional Information:© 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS. Accepted 2012 February 22. Received 2012 February 15; in original form 2011 December 21. Published: 10 May 2012. We wish to thank M. Livingstone for suggesting the glitch hypothesis in the timing section of this paper. The Parkes Observatory is part of the Australia Telescope, which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.
Group:TAPIR
Funders:
Funding AgencyGrant Number
Commonwealth of AustraliaUNSPECIFIED
Subject Keywords:stars: magnetars – pulsars: individual: PSR J1622−4950
Record Number:10.1111/j.1365-2966.2012.20807.x
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130214-090248214
Official Citation:L. Levin, M. Bailes, S. D. Bates, N. D. R. Bhat, M. Burgay, S. Burke-Spolaor, N. D’Amico, S. Johnston, M. J. Keith, M. Kramer, S. Milia, A. Possenti, B. Stappers, W. van Straten; Radio emission evolution, polarimetry and multifrequency single pulse analysis of the radio magnetar PSR J1622−4950, Monthly Notices of the Royal Astronomical Society, Volume 422, Issue 3, 21 May 2012, Pages 2489–2500, https://doi.org/10.1111/j.1365-2966.2012.20807.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36916
Collection:CaltechAUTHORS
Deposited By: JoAnn Boyd
Deposited On:05 Mar 2013 18:57
Last Modified:11 Dec 2018 00:11

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