155 articles – 1965 Notices  [english version]
HAL : in2p3-00369625, version 1

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4th International Meeting on High Energy Gamma-Ray Astronomy, Heidelberg : Allemagne (2008)
High-energy flux evolution of Pulsar Wind Nebulae
F. Mattana1, 2, M. Falanga3, D. Götz3, R. Terrier1, P. Esposito2, A. Pellizzoni, A. De Luca2, V. Marandon1, A. Goldwurm1, P. Caraveo2
(12/2008)

The very high energy γ-ray spectra of Pulsar Wind Nebulae are interpreted as due to inverse Compton scattering of ultrarelativistic electrons on the ambient photons, whereas their X-ray spectra are due to synchrotron emission. We investigate the relation between the γ- and X-ray emission and the pulsars' spin-down luminosity and characteristic age. We find that the γ-to X-ray flux ratio of the nebulae is inversely proportional to the spin-down luminosity (~Ė-1.9) and to the characteristic age (~τc2.2) of the parent pulsar. We interpret these results as due to the evolution of the electron energy distribution and the nebular dynamics, supporting the idea of so-called relic pulsar wind nebulae. These empirical relations provide a new tool to classify unidentified diffuse γ-ray sources and to estimate the spin-down luminosity and characteristic age for four rotation powered pulsars with no detected pulsation from the X- and γ-ray properties of the associated pulsar wind nebulae.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  Istituto di Astrofisica Spaziale e Fisica cosmica - INAF
3 :  SEDI - Service d'Electronique, des Détecteurs et d'Informatique
APC - AHE
Physique/Astrophysique/Phénomènes cosmiques de haute energie

Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
pulsars – nebulae – gamma-ray spectra – X-ray spectra