Spectral and timing properties of IGR J00291+5934 during its 2015 outburst

Tiziana Di Salvo, Rosario Iaria, D'Aì, Riggio, Bozzo, Pintore, Egron, Sanna, Burderi, Papitto, Ferrigno, Di Salvo

Risultato della ricerca: Articlepeer review

20 Citazioni (Scopus)

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 < P˙ orb < 6.5 × 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).
Lingua originaleEnglish
pagine (da-a)2910-2917
Numero di pagine8
RivistaMonthly Notices of the Royal Astronomical Society
Volume466
Stato di pubblicazionePublished - 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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