SMITH, D.A.; BRUEL, P.; COGNARD, I.; CAMERON, A.D.; CAMILO, F.; DAI, S.; GUILLEMOT, L.; JOHNSON, T.J.; JOHNSTON, S.; KEITH, M.J.; KERR, M.; KRAMER, M.; LYNE, A.G.; MANCHESTER, R.N.; SHANNON, R.; SOBEY, C.; STAPPERS, B.W.; WELTEVREDE, P.

doi:10.3847/1538-4357/aaf57d

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SMITH, D.A.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

BRUEL, P.
Laboratoire Leprince-Ringuet [LLR]

COGNARD, I.
Laboratoire de physique et chimie de l'environnement [LPCE]
Unité Scientifique de la Station de Nançay [USN]

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Astrophys.J.. 2019, vol. 871, n° 1, p. 78

Résumé en anglais

Identifying as many gamma-ray pulsars as possible in the Fermi Large Area Telescope (LAT) data helps test pulsar emission models by comparing predicted and observed properties for a large, varied sample with as little selection bias as possible. It also improves extrapolations from the observed population to estimate the contribution of unresolved pulsars to the diffuse gamma-ray emission. We use a recently developed method to determine the probability that a given gamma-ray photon comes from a known position in the sky, convolving the photon's energy with the LAT's energy-dependent point-spread function, without the need for an accurate spatial and spectral model of the gamma-ray sky around the pulsar. The method is simple and fast and, importantly, provides probabilities, or weights, for gamma-rays from pulsars too faint for phase-integrated detection. We applied the method to over a thousand pulsars for which we obtained rotation ephemerides from radio observations, and discovered gamma-ray pulsations from 16 pulsars, 12 young and 4 recycled. PSR J2208+4056 has spindown power erg s−1, about three times lower than the previous observed gamma-ray emission "deathline." PSRs J2208+4056 and J1816−0755 have radio interpulses, constraining their geometry and perhaps enhancing their gamma-ray luminosity. We discuss whether the deathline is an artifact of selection bias due to the pulsar distance.< Réduire

Mots clés en anglais

gamma rays: stars

pulsars: individual

(J0636+5129

J1731-4744

J1816-0755

J2208+4056)

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Searching a Thousand Radio Pulsars for Gamma-ray Emission

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