CaltechAUTHORS
  A Caltech Library Service

NuSTAR Observations and broadband spectral energy distribution modeling of the millisecond pulsar binary PSR J1023+0038

Li, K. L. and Kong, A. K. H. and Takata, J. and Cheng, K. S. and Tam, P. H. T. and Hui, C. Y. and Jin, Ruolan (2014) NuSTAR Observations and broadband spectral energy distribution modeling of the millisecond pulsar binary PSR J1023+0038. Astrophysical Journal, 797 (2). Art. No. 111. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20150401-112116690

[img] PDF - Published Version
See Usage Policy.

944Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20150401-112116690

Abstract

We report the first hard X-ray (3-79 keV) observations of the millisecond pulsar (MSP) binary PSR J1023+0038 using NuSTAR. This system has been shown transiting between a low-mass X-ray binary (LMXB) state and a rotation-powered MSP state. The NuSTAR observations were taken in both LMXB state and rotation-powered state. The source is clearly seen in both states up to similar to 79 keV. During the LMXB state, the 3-79 keV flux is about a factor of 10 higher than in the rotation-powered state. The hard X-rays show clear orbital modulation during the X-ray faint rotation-powered state but the X-ray orbital period is not detected in the X-ray bright LMXB state. In addition, the X-ray spectrum changes from a flat power-law spectrum during the rotation-powered state to a steeper power-law spectrum in the LMXB state. We suggest that the hard X-rays are due to the intrabinary shock from the interaction between the pulsar wind and the injected material from the low-mass companion star. During the rotation-powered MSP state, the X-ray orbital modulation is due to Doppler boosting of the shocked pulsar wind. At the LMXB state, the evaporating matter of the accretion disk due to the gamma-ray irradiation from the pulsar stops almost all the pulsar wind, resulting in the disappearance of the X-ray orbital modulation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/797/2/111DOIArticle
http://iopscience.iop.org/0004-637X/797/2/111/PublisherArticle
ORCID:
AuthorORCID
Li, K. L.0000-0001-8229-2024
Kong, A. K. H.0000-0002-5105-344X
Takata, J.0000-0002-8731-0129
Cheng, K. S.0000-0002-8043-9851
Tam, P. H. T.0000-0002-1262-7375
Hui, C. Y.0000-0003-1753-1660
Jin, Ruolan0000-0002-9652-0056
Additional Information:© 2014 American Astronomical Society. Received 2014 May 19, accepted for publication 2014 October 16. Published 2014 December 5. K.L.L., A.K.H.K., and R.J. are supported by the Ministry of Science and Technology of the Republic of China (Taiwan) through grants 100-2628-M-007-002-MY3, 100-2923-M-007-001-MY3, and 101-2119-M-008-007-MY3. J.T. and K.S.C. are supported by a GRF grant of the HK Government under HKU 17300814P. P.H.T. is supported by the Ministry of Science and Technology of the Republic of China (Taiwan) through grant 101-2112-M-007-022-MY3. C.Y.H. is supported by the National Research Foundation of Korea through grant 2011-0023383. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and Caltech (USA). Facilities: NuSTAR, Swift
Group:NuSTAR
Funders:
Funding AgencyGrant Number
Ministry of Science and Technology (Taipei)100-2628-M-007-002-MY3
Ministry of Science and Technology (Taipei)100-2923-M-007- 001-MY3
Ministry of Science and Technology (Taipei)101-2119-M-008-007-MY3
General Research Fund (Hong Kong)17300814P
Ministry of Science and Technology (Taipei)101-2112-M-007-022-MY3
National Research Foundation of Korea2011-0023383
Record Number:CaltechAUTHORS:20150401-112116690
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150401-112116690
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56285
Collection:CaltechAUTHORS
Deposited By: Joy Painter
Deposited On:01 Apr 2015 19:02
Last Modified:22 Mar 2019 16:56

Repository Staff Only: item control page