Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published May 21, 2015 | Published + Submitted
Journal Article Open

A study of multifrequency polarization pulse profiles of millisecond pulsars

Abstract

We present high signal-to-noise ratio, multifrequency polarization pulse profiles for 24 millisecond pulsars that are being observed as part of the Parkes Pulsar Timing Array project. The pulsars are observed in three bands, centred close to 730, 1400 and 3100 MHz, using a dual-band 10 cm/50 cm receiver and the central beam of the 20-cm multibeam receiver. Observations spanning approximately six years have been carefully calibrated and summed to produce high S/N profiles. This allows us to study the individual profile components and in particular how they evolve with frequency. We also identify previously undetected profile features. For many pulsars we show that pulsed emission extends across almost the entire pulse profile. The pulse component widths and component separations follow a complex evolution with frequency; in some cases these parameters increase and in other cases they decrease with increasing frequency. The evolution with frequency of the polarization properties of the profile is also non-trivial. We provide evidence that the pre- and post-cursors generally have higher fractional linear polarization than the main pulse. We have obtained the spectral index and rotation measure for each pulsar by fitting across all three observing bands. For the majority of pulsars, the spectra follow a single power-law and the position angles follow a λ^2 relation, as expected. However, clear deviations are seen for some pulsars. We also present phase-resolved measurements of the spectral index, fractional linear polarization and rotation measure. All these properties are shown to vary systematically over the pulse profile.

Additional Information

© 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 March 5. Received 2015 February 25; in original form 2014 December 16. First published online April 9, 2015. The Parkes radio telescope is part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. This work was supported by the Australian Research Council through grant DP140102578. SD is supported by China Scholarship Council (CSC). GH is a recipient of a Future Fellowship from the Australian Research Council. VR is a recipient of a John Stocker postgraduate scholarship from the Science and Industry Endowment Fund of Australia. LW acknowledges support from the Australian Research Council. RXX is supported by the National Basic Research Program of China (973 program, 2012CB821800), the National Natural Science Foundation of China (grant no. 11225314) and XTP XDA04060604. We acknowledge the help and support of F. Jenet who supervised AM's contribution to this work. This work made use of NASA's ADS system.

Attached Files

Published - MNRAS-2015-Dai-3223-62.pdf

Submitted - 1503.01841v1.pdf

Files

1503.01841v1.pdf
Files (10.1 MB)
Name Size Download all
md5:d242eaf921a66ab04d803c89b572f34a
5.3 MB Preview Download
md5:d6d9f854a0f559e7959e702aef5bc8d3
4.7 MB Preview Download

Additional details

Created:
August 20, 2023
Modified:
October 23, 2023