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  The Braking Index of a Radio-quiet Gamma-ray Pulsar

Clark, C. J., Pletsch, H. J., Wu, J., Guillemot, L., Camilo, F., Johnson, T. J., et al. (2016). The Braking Index of a Radio-quiet Gamma-ray Pulsar. The Astrophysical Journal Letters, 832(1): L15. doi:10.3847/2041-8205/832/1/L15.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-39FE-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-E975-4
Genre: Journal Article

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 Creators:
Clark, C. J.1, Author
Pletsch, H. J.2, Author              
Wu, J., Author
Guillemot, L., Author
Camilo, F., Author
Johnson, T. J., Author
Kerr, M., Author
Allen, B.3, Author              
Aulbert, C.3, Author              
Beer, C., Author
Bock, O.3, Author              
Cuéllar, A., Author
Eggenstein, H. B.1, Author
Fehrmann, H.3, Author              
Kramer, M., Author
Machenschalk, B.3, Author              
Nieder, L., Author
Affiliations:
1AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, Hannover, DE, ou_24009              
2Pulsar Observation and Data Analysis, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_2253649              
3Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 Abstract: We report the discovery and timing measurements of PSR J1208-6238, a young and highly magnetized gamma-ray pulsar, with a spin period of 440 ms. The pulsar was discovered in gamma-ray photon data from the Fermi Large Area Telescope (LAT) during a blind-search survey of unidentified LAT sources, running on the distributed volunteer computing system Einstein@Home. No radio pulsations were detected in dedicated follow-up searches with the Parkes radio telescope, with a flux density upper limit at 1369 MHz of 30 $\mu$Jy. By timing this pulsar's gamma-ray pulsations, we measure its braking index over five years of LAT observations to be $n = 2.598 \pm 0.001 \pm 0.1$, where the first uncertainty is statistical and the second estimates the bias due to timing noise. Assuming its braking index has been similar since birth, the pulsar has an estimated age of around 2,700 yr, making it the youngest pulsar to be found in a blind search of gamma-ray data and the youngest known radio-quiet gamma-ray pulsar. Despite its young age the pulsar is not associated with any known supernova remnant or pulsar wind nebula. The pulsar's inferred dipolar surface magnetic field strength is $3.8 \times 10^{13}$ G, almost 90% of the quantum-critical level. We investigate some potential physical causes of the braking index deviating from the simple dipole model but find that LAT data covering a longer time interval will be necessary to distinguish between these.

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 Dates: 2016-11-042016-11-072016
 Publication Status: Published in print
 Pages: 6 pages, 2 figures, accepted for publication in ApJL; fixed typo in title
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1611.01292
DOI: 10.3847/2041-8205/832/1/L15
URI: http://arxiv.org/abs/1611.01292
 Degree: -

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Title: The Astrophysical Journal Letters
Source Genre: Journal
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Pages: - Volume / Issue: 832 (1) Sequence Number: L15 Start / End Page: - Identifier: -