On the 2018 Outburst of the Accreting Millisecond X-Ray Pulsar Swift J1756.9–2508 As Seen with NICER
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.; Ray, Paul. S.; Saylor, Maxine R.; Strohmayer, Tod E.; Chakrabarty, Deepto; Ho, Wynn; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space Research
The Astrophysical Journal
American Astronomical Society/IOP Publishing
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.
Final published version