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
DownloadBult_2018_ApJ_864_14.pdf (705.9Kb)
PUBLISHER_POLICY
Publisher Policy
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Terms of use
Metadata
Show full item recordAbstract
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.
Date issued
2018-08Department
Massachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space ResearchJournal
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
ISSN
1538-4357