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The multicomponent nature of the Vela pulsar nonthermal X-ray spectrum


Harding, AK and Strickman, MS and Gwinn, C and Dodson, R and Moffett, DA and McCulloch, PM, The multicomponent nature of the Vela pulsar nonthermal X-ray spectrum, The Astrophysical Journal, 576, (1) pp. 376-380. ISSN 0004-637X (2002) [Refereed Article]

DOI: doi:10.1086/341732


We report on our analysis of a 274 ks observation of the Vela pulsar with the Rossi X-Ray Timing Explorer (RXTE). The double-peaked, pulsed emission at 2-30 keV, which we had previously detected during a 93 ks observation, is confirmed with much-improved statistics. There is now clear evidence, in both the spectrum and the light curve, that the emission in the RXTE band is a blend of two separate nonthermal components. The spectrum of the harder component connects smoothly with the OSSE, COMPTEL, and EGRET spectra, and the peaks in the light curve are in phase coincidence with those of the high-energy light curve. The spectrum of the softer component is consistent with an extrapolation to the pulsed optical flux, and the second RXTE pulse is in phase coincidence with the second optical peak. In addition, we see a peak in the 2-8 keV RXTE pulse profile at the radio phase.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dodson, R (Mr Richard Dodson)
UTAS Author:Moffett, DA (Dr David Moffett)
UTAS Author:McCulloch, PM (Professor Peter McCulloch)
ID Code:25229
Year Published:2002
Web of Science® Times Cited:51
Deposited By:Physics
Deposited On:2002-08-01
Last Modified:2003-05-07

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