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AuthorsM. Linares, R. Wijnands, M. van der Klis, H. Krimm, C.B. Markwardt, D. Chakrabarty
TitleTiming and spectral properties of the accreting millisecond pulsar SWIFT J1756.9-2508
JournalAstrophysical Journal
Volume677
Year2008
Issue1
Pages515-519
ISSN0004637X
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
AbstractSWIFT J1756.9–2508 is one of the few accreting millisecond pulsars (AMPs) discovered to date. We report here the results of our analysis of its aperiodic X-ray variability, as measured with the Rossi X-Ray Timing Explorer during the 2007 outburst of the source. We detect strong (~35%) flat-topped broadband noise throughout the outburst with low characteristic frequencies (~0.1 Hz). This makes SWIFT J1756.9–2508 similar to the rest of AMPs and to other low-luminosity accreting neutron stars when they are in their hard states, and enables us to classify this AMP as an atoll source in the extreme island state. We also find a hard tail in its energy spectrum extending up to 100 keV, fully consistent with such source and state classification.
Document typeArticle
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