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Likely detection of pulsed high-energy γ-rays from millisecond pulsar PSR J0218+4232

Published online by Cambridge University Press:  12 April 2016

L. Kuiper ,
W. Hermsen ,
F. Verbunt ,
A. Lyne ,
I. Stairs ,
D.J. Thompson  and
G. Cusumano
L. Kuiper
Affiliation:
SRON-Utrecht, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands
W. Hermsen
Affiliation:
SRON-Utrecht, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands
F. Verbunt
Affiliation:
Astronomical Institute Utrecht, 3508 TA, Utrecht, The Netherlands
A. Lyne
Affiliation:
University of Manchester, Jodrell Bank, Macclesfield SK11 9DL, UK
I. Stairs
Affiliation:
University of Manchester, Jodrell Bank, Macclesfield SK11 9DL, UK
D.J. Thompson
Affiliation:
Code 661, LHEA, NASA GSFC, Greenbelt, MD 20771, USA
G. Cusumano
Affiliation:
IFCAI CNR, Via U.La Malfa 153, I-90146, Palermo, Italy

Abstract

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We report on the likely detection of pulsed high-energy γ-rays from the binary millisecond pulsar PSR J0218+4232 in 100–1000 MeV data from CGRO EGRET. Imaging analysis demonstrates that the highly significant γ-ray source 2EG J0220+4228 (∼ 10σ) is for energies > 100 MeV positionally consistent with both PSR J0218+4232 and the BL Lac 3C66A. However, above 1 GeV 3C66A is the evident counterpart, whereas between 100 and 300 MeV PSR J0218+4232 is the most likely one. Timing analysis using one ephemeris valid for all EGRET observations yields in the 100-1000 MeV range a double-pulse profile at a ∼ 3.5σ significance level. The phase separation is similar to the component separation of ∼ 0.47 observed at X-rays. A comparison of the γ-ray profile with the 610 MHz radio profile in absolute phase shows that the two γ- ray pulses coincide with two of the three emission features in the complex radio profile.

Type
Part 5. High-Energy Observations
Information
International Astronomical Union Colloquium , Volume 177: Pulsar Astronomy - 2000 and Beyond , 2000 , pp. 355 - 358
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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