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Title: The High Time Resolution Universe Pulsar Survey - IV. Discovery and polarimetry of millisecond pulsars: HTRU IV: discovery and polarization of MSPs

We present the discovery of six millisecond pulsars (MSPs) in the High Time Reso- lution Universe (HTRU) survey for pulsars and fast transients carried out with the Parkes radio telescope. All six are in binary systems with approximately circular or- bits and are likely to have white dwarf companions. PSR J1017–7156 has a high flux density and a narrow pulse width, making it ideal for precision timing experiments. PSRs J1446–4701 and J1125–5825 are coincident with gamma-ray sources, and fold- ing the high-energy photons with the radio timing ephemeris shows evidence of pulsed gamma-ray emission. PSR J1502–6752 has a spin period of 26.7 ms, and its low period derivative implies that it is a recycled pulsar. The orbital parameters indicate it has a very low mass function, and therefore a companion mass much lower than usually expected for such a mildly recycled pulsar. In addition we present polarisation profiles for all 12 MSPs discovered in the HTRU survey to date. Similar to previous observations of MSPs, we find that many have large widths and a wide range of linear and circular polarisation fractions. Their polarisation profiles can be highly complex, and although the observed position angles often do not obey themore » rotating vector model, we present several examples of those that do. We speculate that the emission heights of MSPs are a substantial fraction of the light cylinder radius in order to explain broad emission profiles, which then naturally leads to a large number of cases where emission from both poles is observed.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [5] ;  [3] ;  [4] ;  [10]
  1. Australia Telescope National Facility, Epping, NSW (Australia)
  2. Swinburne Univ. of Technology (Australia); Univ. of California, Berkeley, CA (United States); ARC centre of Excellence for All-Sky Astrophysics (Australia)
  3. Univ. of Manchester (United Kingdom)
  4. Swinburne Univ. of Technology (Australia); ARC centre of Excellence for All-Sky Astrophysics (Australia)
  5. Istituto Nazionale di Astrofisica (INAF), Capoterra (Italy). Osservatorio Astronomico di Cagliari
  6. Swinburne Univ. of Technology (Australia)
  7. Univ. of Manchester (United Kingdom); Max Planck Inst. for Radioastronomy, Bonn (Germany)
  8. Australia Telescope National Facility, Epping, NSW (Australia); Swinburne Univ. of Technology (Australia)
  9. Istituto Nazionale di Astrofisica (INAF), Capoterra (Italy). Osservatorio Astronomico di Cagliari; Cittadella Univ., Monserrato (Italy)
  10. George Mason Univ., Fairfax, VA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 419; Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1356771

Keith, M. J., Johnston, S., Bailes, M., Bates, S. D., Bhat, N. D. R., Burgay, M., Burke-Spolaor, S., D’Amico, N., Jameson, A., Kramer, M., Levin, L., Milia, S., Possenti, A., Stappers, B. W., van Straten, W., and Parent, D.. The High Time Resolution Universe Pulsar Survey - IV. Discovery and polarimetry of millisecond pulsars: HTRU IV: discovery and polarization of MSPs. United States: N. p., Web. doi:10.1111/j.1365-2966.2011.19842.x.
Keith, M. J., Johnston, S., Bailes, M., Bates, S. D., Bhat, N. D. R., Burgay, M., Burke-Spolaor, S., D’Amico, N., Jameson, A., Kramer, M., Levin, L., Milia, S., Possenti, A., Stappers, B. W., van Straten, W., & Parent, D.. The High Time Resolution Universe Pulsar Survey - IV. Discovery and polarimetry of millisecond pulsars: HTRU IV: discovery and polarization of MSPs. United States. doi:10.1111/j.1365-2966.2011.19842.x.
Keith, M. J., Johnston, S., Bailes, M., Bates, S. D., Bhat, N. D. R., Burgay, M., Burke-Spolaor, S., D’Amico, N., Jameson, A., Kramer, M., Levin, L., Milia, S., Possenti, A., Stappers, B. W., van Straten, W., and Parent, D.. 2011. "The High Time Resolution Universe Pulsar Survey - IV. Discovery and polarimetry of millisecond pulsars: HTRU IV: discovery and polarization of MSPs". United States. doi:10.1111/j.1365-2966.2011.19842.x. https://www.osti.gov/servlets/purl/1356771.
@article{osti_1356771,
title = {The High Time Resolution Universe Pulsar Survey - IV. Discovery and polarimetry of millisecond pulsars: HTRU IV: discovery and polarization of MSPs},
author = {Keith, M. J. and Johnston, S. and Bailes, M. and Bates, S. D. and Bhat, N. D. R. and Burgay, M. and Burke-Spolaor, S. and D’Amico, N. and Jameson, A. and Kramer, M. and Levin, L. and Milia, S. and Possenti, A. and Stappers, B. W. and van Straten, W. and Parent, D.},
abstractNote = {We present the discovery of six millisecond pulsars (MSPs) in the High Time Reso- lution Universe (HTRU) survey for pulsars and fast transients carried out with the Parkes radio telescope. All six are in binary systems with approximately circular or- bits and are likely to have white dwarf companions. PSR J1017–7156 has a high flux density and a narrow pulse width, making it ideal for precision timing experiments. PSRs J1446–4701 and J1125–5825 are coincident with gamma-ray sources, and fold- ing the high-energy photons with the radio timing ephemeris shows evidence of pulsed gamma-ray emission. PSR J1502–6752 has a spin period of 26.7 ms, and its low period derivative implies that it is a recycled pulsar. The orbital parameters indicate it has a very low mass function, and therefore a companion mass much lower than usually expected for such a mildly recycled pulsar. In addition we present polarisation profiles for all 12 MSPs discovered in the HTRU survey to date. Similar to previous observations of MSPs, we find that many have large widths and a wide range of linear and circular polarisation fractions. Their polarisation profiles can be highly complex, and although the observed position angles often do not obey the rotating vector model, we present several examples of those that do. We speculate that the emission heights of MSPs are a substantial fraction of the light cylinder radius in order to explain broad emission profiles, which then naturally leads to a large number of cases where emission from both poles is observed.},
doi = {10.1111/j.1365-2966.2011.19842.x},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 419,
place = {United States},
year = {2011},
month = {11}
}