Six millisecond pulsars detected by the Fermi Large Area Telescope and the radio/gamma-ray connection of millisecond pulsars
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Open access via publisher
Authors
Espinoza, C.
Guillemot, L.
Celik, O.
Weltevrede, P.
Stappers, B.
Smith, D.
Kerr, M.
Zavlin, V.
Cognard, I.
Eatough, R.
Freire, P.
Janssen, G.
Camilo, F.
Desvignes, G.
Hewitt, J.
Hou, X.
Johnston, S.
Keith, M.
Kramer, M.
Lyne, A.
Manchester, R.
Ransom, S.
Ray, P.
Shannon, Ryan
Theureau, G.
Webb, N.
Date
2013Type
Journal Article
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Espinoza, C. and Guillemot, L. and Celik, O. and Weltevrede, P. and Stappers, B. and Smith, D. and Kerr, M. et al. 2013. Six millisecond pulsars detected by the Fermi Large Area Telescope and the radio/gamma-ray connection of millisecond pulsars. Monthly Notices of the Royal Astronomical Society. 430 (1): pp. 571-587.
Source Title
Monthly Notices of the Royal Astronomical Society
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School
Curtin Institute of Radio Astronomy (Physics)
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Abstract
We report on the discovery of gamma-ray pulsations from five millisecond pulsars (MSPs) using the Fermi Large Area Telescope (LAT) and timing ephemerides provided by various radio observatories. We also present confirmation of the gamma-ray pulsations from a sixth source, PSR J2051-0827. Five of these six MSPs are in binary systems: PSRs J1713+0747, J1741+1351, J1600-3053 and the two black widow binary pulsars PSRs J0610-2100 and J2051-0827. The only isolated MSP is the nearby PSR J1024-0719, which is also known to emit X-rays. We present X-ray observations in the direction of PSRs J1600-3053 and J2051-0827. While PSR J2051-0827 is firmly detected, we can only give upper limits for the X-ray flux of PSR J1600-3053. There are no dedicated X-ray observations available for the other three objects.The MSPs mentioned above, together with most of the MSPs detected by Fermi, are used to put together a sample of 30 gamma-ray MSPs. This sample is used to study the morphology and phase connection of radio and gamma-ray pulse profiles. We show that MSPs with pulsed gamma-ray emission which is phase-aligned with the radio emission present the steepest radio spectra and the largest magnetic fields at the light cylinder among all MSPs. Also, we observe a trend towards very low, or undetectable, radio linear polarization levels. These properties could be attributed to caustic radio emission produced at a range of different altitudes in the magnetosphere. We note that most of these characteristics are also observed in the Crab pulsar, the only other radio pulsar known to exhibit phase-aligned radio and gamma-ray emission. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
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