On the 2018 Outburst of the Accreting Millisecond X-Ray Pulsar Swift J1756.9–2508 As Seen with NICER
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Bult_2018_ApJ_864_14.pdf
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Author(s)
Bult, Peter
Altamirano, Diego
Arzoumanian, Zaven
Gendreau, Keith C.
Guillot, Sebastien
Jaisawal, Gaurava K.
Lentine, Steven
Markwardt, Craig B.
Ngo, Son N.
Pope, John S.
Date Issued
August 2018
Journal
The Astrophysical Journal
Publisher
American Astronomical Society/IOP Publishing
Citation
Bult, Peter, Diego Altamirano, Zaven Arzoumanian, Deepto Chakrabarty, Keith C. Gendreau, Sebastien Guillot, Wynn C. G. Ho, et al. “On the 2018 Outburst of the Accreting Millisecond X-Ray Pulsar Swift J1756.9–2508 As Seen with NICER.” The Astrophysical Journal 864, no. 1 (August 27, 2018): 14.
Version
Final published version
Abstract
We report on the coherent timing analysis of the 182 Hz accreting millisecond X-ray pulsar Swift J1756.9-2508 during its 2018 outburst as observed with the Neutron Star Interior Composition Explorer (NICER). Combining our NICER observations with Rossi X-ray Timing Explorer observations of the 2007 and 2009 outbursts, we also studied the long-Term spin and orbital evolution of this source. We find that the binary system is well described by a constant orbital period model, with an upper limit on the orbital period derivative of s s-1. Additionally, we improve upon the source coordinates through astrometric analysis of the pulse arrival times, finding R.A. = 17h56m57.18 ± 0.08 and decl. =-25°06′27.″8 ± 3.″5, while simultaneously measuring the long-Term spin frequency derivative as Hz s-1. We briefly discuss the implications of these measurements in the context of the wider population of accreting millisecond pulsars.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/1538-4357/aad5e5
