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|a Krivonos, Roman A.
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|a Massachusetts Institute of Technology. Department of Physics
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Chakrabarty, Deepto
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|a Tsygankov, Sergey S.
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|a Lutovinov, Alexander A.
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|a Tomsick, John A.
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|a Chakrabarty, Deepto
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|a Bachetti, Matteo
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|a Boggs, Steven E.
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|a Chernyakova, Masha
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|a Christensen, Finn E.
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|a Craig, William W.
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|a Fürst, Felix
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|a Hailey, Charles J.
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|a Harrison, Fiona A.
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|a Lansbury, George B.
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|a Rahoui, Farid
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|a Stern, Daniel
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|a Zhang, William W.
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|a NuSTAR DISCOVERY OF AN UNUSUALLY STEADY LONG-TERM SPIN-UP OF THE Be BINARY 2RXP J130159.6-635806
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|b IOP Publishing,
|c 2015-11-13T15:05:59Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/99917
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|a We present spectral and timing analyses of Nuclear Spectroscopic Telescope Array (NuSTAR) observations of the accreting X-ray pulsar 2RXP J130159.6-635806. The source was serendipitously observed during a campaign focused on the gamma-ray binary PSR B1259-63 and was later targeted for a dedicated observation. The spectrum has a typical shape for accreting X-ray pulsars, consisting of a simple power law with an exponential cutoff starting at ~7 keV with a folding energy of E[subscript fold] ≃ 18 keV. There is also an indication of the presence of a 6.4 keV iron line in the spectrum at the ~3σ significance level. NuSTAR measurements of the pulsation period reveal that the pulsar has undergone a strong and steady spin-up for the last 20 years. The pulsed fraction is estimated to be ~80%, and is constant with energy up to 40 keV. The power density spectrum shows a break toward higher frequencies relative to the current spin period. This, together with steady persistent luminosity, points to a long-term mass accretion rate high enough to bring the pulsar out of spin equilibrium.
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|a en_US
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|a Article
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|t The Astrophysical Journal
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