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http://hdl.handle.net/20.500.12386/26997
Title: | Spectral and timing properties of IGR J00291+5934 during its 2015 outburst | Authors: | Sanna, A. Pintore, Fabio Bozzo, E. Ferrigno, C. PAPITTO, ALESSANDRO Riggio, A. Di Salvo, T. Iaria, R. D'AI', ANTONINO EGRON, ELISE MARIE JEANNE Burderi, L. |
Issue Date: | 2017 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 466 | Issue: | 3 | First Page: | 2910 | 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 kT<SUB>e</SUB> ∼ 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<SUP>-13</SUP> s s<SUP>-1</SUP> < dot{P}_{orb} < 6.5 × 10^{-13} s s<SUP>-1</SUP> 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). | URI: | http://hdl.handle.net/20.500.12386/26997 | URL: | https://academic.oup.com/mnras/article/466/3/2910/2733861 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw3332 | Bibcode ADS: | 2017MNRAS.466.2910S | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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stw3332.pdf | PDF editoriale | 1 MB | Adobe PDF | View/Open |
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