Artigo Acesso aberto Revisado por pares

Time Evolution of the X-Ray and γ-Ray Fluxes of the Crab Pulsar

2018; IOP Publishing; Volume: 865; Issue: 1 Linguagem: Inglês

10.3847/1538-4357/aad911

ISSN

1538-4357

Autores

L. L. Yan, Mingyu Ge, F. J. Lu, S. J. Zheng, Y. L. Tuo, Zijian Li, L. M. Song, J. L. Qu,

Tópico(s)

Astrophysical Phenomena and Observations

Resumo

Abstract We studied the evolution of the X-ray and γ -ray spectra of the Crab pulsar utilizing the 11-year observations from the Rossi X-ray Timing Explorer ( RXTE ) and 9-year observations from the Fermi Gamma-ray Space Telescope ( FGST ). By fitting the spectrum of each observation, we obtained the corresponding flux and then analyzed the long-term evolution of the X-ray (or γ -ray) luminosities as well as their correlations with the spin-down power of the pulsar. The X-ray flux in 5–60 keV obtained by the Proportional Counter Array of RXTE decreases with a rate of (−2.4 ± 0.4) × 10 −14 erg cm −2 s −1 per day. The X-ray flux in 15–250 keV obtained by the High Energy X-ray Timing Experiment of RXTE and the γ -ray flux in 0.1–300 GeV by the Large Area Telescope onboard FGST show similar decreasing trends but are insignificant statistically. The 5–60 keV X-ray luminosity L X is correlated with the spin-down power L sd by <?CDATA ${L}_{{\rm{X}}}\propto {L}_{\mathrm{sd}}^{1.6\pm 0.3}$?> , which is similar to the statistical results for young pulsars.

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