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dc.contributor.authorPosselt, B.
dc.contributor.authorArumugasamy, P.
dc.contributor.authorPavlov, G.
dc.contributor.authorManchester, R.
dc.contributor.authorShannon, Ryan
dc.contributor.authorKargaltsev, O.
dc.identifier.citationPosselt, B. and Arumugasamy, P. and Pavlov, G. and Manchester, R. and Shannon, R. and Kargaltsev, O. 2012. XMM-Newton observation of the very old pulsar J0108-1431. Astrophysical Journal. 761 (2): Article ID 117.

We report on an X-ray observation of the 166 Myr old radio pulsar J0108–1431 with XMM-Newton. The X-ray spectrum can be described by a power-law model with a relatively steep photon index Γ ≈ 3 or by a combination of thermal and non-thermal components, e.g., a power-law component with fixed photon index Γ = 2 plus a blackbody component with a temperature of kT = 0.11 keV. The two-component model appears more reasonable considering different estimates for the hydrogen column density N H. The non-thermal X-ray efficiency in the single power-law model is η PL1-10keV/E ~ 0.003, higher than in most other X-ray-detected pulsars. In the case of the combined model, the non-thermal and thermal X-ray efficiencies are even higher, η PL1-10keV ~ ηbbPC ~ 0.006. We detected X-ray pulsations at the radio period of P ≈ 0.808 s with significance of ≈7σ. The pulse shape in the folded X-ray light curve (0.15-2 keV) is asymmetric, with statistically significant contributions from up to five leading harmonics. Pulse profiles at two different energy ranges differ slightly: the profile is asymmetric at low energies, 0.15-1 keV, while at higher energies, 1-2 keV, it has a nearly sinusoidal shape. The radio pulse peak leads the 0.15-2 keV X-ray pulse peak by Δ ø = 0.06 ± 0.03.

dc.titleXMM-Newton observation of the very old pulsar J0108-1431
dc.typeJournal Article
dcterms.source.titleAstrophysical Journal
curtin.departmentCurtin Institute of Radio Astronomy (Physics)
curtin.accessStatusOpen access via publisher

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