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- W2563732504 abstract "We report on the spectral and timing properties of the accreting millisecond X-ray pulsar IGR J00291+5934 observed by XMM–Newton and NuSTAR during its 2015 outburst. The source is in a hard state dominated at high energies by a Comptonization of soft photons (∼0.9 keV) by an electron population with kTe ∼ 30 keV, and at lower energies by a blackbody component with kT ∼ 0.5 keV. A moderately broad, neutral Fe emission line and four narrow absorption lines are also found. By investigating the pulse phase evolution, we derived the best-fitting orbital solution for the 2015 outburst. Comparing the updated ephemeris with those of the previous outbursts, we set a 3σ confidence level interval −6.6 × 10−13 s s−1|$< dot{P}_{{rm orb}} < 6.5 times 10^{-13}$| s s−1 on the orbital period derivative. Moreover, we investigated the pulse profile dependence on energy finding a peculiar behaviour of the pulse fractional amplitude and lags as a function of energy. We performed a phase-resolved spectroscopy showing that the blackbody component tracks remarkably well the pulse profile, indicating that this component resides at the neutron star surface (hotspot)." @default.
- W2563732504 created "2017-01-06" @default.
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- W2563732504 date "2016-12-22" @default.
- W2563732504 modified "2023-10-17" @default.
- W2563732504 title "Spectral and timing properties of IGR J00291+5934 during its 2015 outburst" @default.
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- W2563732504 doi "https://doi.org/10.1093/mnras/stw3332" @default.
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