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NuSTAR observations of the supergiant X-ray pulsar IGR J18027-2016: accretion from the stellar wind and possible cyclotron absorption line

Lutovinov, Alexander A. and Tsygankov, Sergey S. and Postnov, Konstantin A. and Krivonos, Roman A. and Molkov, Sergey V. and Tomsick, John A. (2017) NuSTAR observations of the supergiant X-ray pulsar IGR J18027-2016: accretion from the stellar wind and possible cyclotron absorption line. Monthly Notices of the Royal Astronomical Society, 466 (1). pp. 593-599. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20160914-124807381

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Abstract

We report on the first focused hard X-ray view of the absorbed supergiant system IGR J18027−2016 performed with the Nuclear Spectroscopic Telescope Array observatory. The pulsations are clearly detected with a period of P_(spin)=139.866(1) s and a pulse fraction of about 50–60 per cent at energies from 3 to 80 keV. The source demonstrates an approximately constant X-ray luminosity on a time-scale of more than dozen years with an average spin-down rate of P ≃ 6x10^(-10) s s^(-1). This behaviour of the pulsar can be explained in terms of the wind accretion model in the settling regime. The detailed spectral analysis at energies above 10 keV was performed for the first time and revealed a possible cyclotron absorption feature at energy ∼23 keV. This energy corresponds to the magnetic field B ≃ 3x10^(12) G at the surface of the neutron star, which is typical for X-ray pulsars.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stw3058DOIArticle
https://academic.oup.com/mnras/article/466/1/593/2613757PublisherArticle
http://arxiv.org/abs/1609.02942arXivDiscussion Paper
ORCID:
AuthorORCID
Tsygankov, Sergey S.0000-0002-9679-0793
Krivonos, Roman A.0000-0003-2737-5673
Tomsick, John A.0000-0001-5506-9855
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 November 21. Received 2016 November 21; in original form 2016 September 8. Published: 29 November 2016. This work was supported by the Russian Science Foundation (grant 14-22-00271). Work of PK is partially supported by RSF grant 14-12-00657. We thank the anonymous referee for useful comments. The research has made use of data obtained with NuSTAR, a project led by Caltech, funded by NASA and managed by NASA/JPL, and has utilized the NUSTARDAS software package, jointly developed by the ASDC (Italy) and Caltech (USA).
Group:NuSTAR
Subject Keywords:accretion, accretion discs – magnetic fields – stars: individual: IGR J18027−2016 –X-rays: binaries
Issue or Number:1
Record Number:CaltechAUTHORS:20160914-124807381
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160914-124807381
Official Citation:Alexander A. Lutovinov, Sergey S. Tsygankov, Konstantin A. Postnov, Roman A. Krivonos, Sergey V. Molkov, John A. Tomsick; NuSTAR observations of the supergiant X-ray pulsar IGR J18027−2016: accretion from the stellar wind and possible cyclotron absorption line, Monthly Notices of the Royal Astronomical Society, Volume 466, Issue 1, 1 April 2017, Pages 593–599, https://doi.org/10.1093/mnras/stw3058
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70350
Collection:CaltechAUTHORS
Deposited By: Joy Painter
Deposited On:14 Sep 2016 22:55
Last Modified:09 Mar 2020 13:19

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