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NuSTAR Observations of Magnetar 1E 1841–045

An, Hongjun and Hascoët, Romain and Kaspi, Victoria M. and Beloborodov, Andrei M. and Dufour, François and Gotthelf, Eric V. and Archibald, Robert and Bachetti, Matteo and Boggs, Steven E. and Christensen, Finn E. and Craig, William W. and Greffenstette, Brian W. and Hailey, Charles J. and Harrison, Fiona A. and Kitaguchi, Takao and Kouveliotou, Chryssa and Madsen, Kristin K. and Markwardt, Craig B. and Stern, Daniel and Vogel, Julia K. and Zhang, William W. (2013) NuSTAR Observations of Magnetar 1E 1841–045. Astrophysical Journal, 779 (2). Art. No. 163. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20140121-141233775

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Abstract

We report new spectral and temporal observations of the magnetar 1E 1841–045 in the Kes 73 supernova remnant obtained with the Nuclear Spectroscopic Telescope Array. Combined with new Swift and archival XMM-Newton and Chandra observations, the phase-averaged spectrum is well characterized by a blackbody plus double power law, in agreement with previous multimission X-ray results. However, we are unable to reproduce the spectral results reported based on Suzaku observations. The pulsed fraction of the source is found to increase with photon energy. The measured rms pulsed fractions are ~12% and ~17% at ~20 and ~50 keV, respectively. We detect a new feature in the 24-35 keV band pulse profile that is uniquely double peaked. This feature may be associated with a possible absorption or emission feature in the phase-resolved spectrum. We fit the X-ray data using the recently developed electron-positron outflow model by Beloborodov for the hard X-ray emission from magnetars. This produces a satisfactory fit, allowing a constraint on the angle between the rotation and magnetic axes of the neutron star of ~20° and on the angle between the rotation axis and line of sight of ~50°. In this model, the soft X-ray component is inconsistent with a single blackbody; adding a second blackbody or a power-law component fits the data. The two-blackbody interpretation suggests a hot spot of temperature kT ≈ 0.9 keV occupying ~1% of the stellar surface.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/779/2/163DOIArticle
http://iopscience.iop.org/0004-637X/779/2/163PublisherArticle
http://arxiv.org/abs/1310.6221arXivDiscussion Paper
ORCID:
AuthorORCID
Bachetti, Matteo0000-0002-4576-9337
Boggs, Steven E.0000-0001-9567-4224
Harrison, Fiona A.0000-0003-2992-8024
Madsen, Kristin K.0000-0003-1252-4891
Stern, Daniel0000-0003-2686-9241
Additional Information:© 2013 American Astronomical Society. Received 2013 August 12; accepted 2013 October 22; published 2013 December 3. This work was supported under NASA contract NNG08FD60C, and made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software, and Calibration Teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS), jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (US). V.M.K. acknowledges support from an NSERC Discovery Grant, the FQRNT Centre de Recherche Astrophysique du Québec, an R. Howard Webster Foundation Fellowship from the Canadian Institute for Advanced Research (CIFAR), the Canada Research Chairs Program, and the Lorne Trottier Chair in Astrophysics and Cosmology. A.M.B. acknowledges the support by NASA grants NNX10AI72G and NNX13AI34G. Part of this work was performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.
Group:NuSTAR, Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANNG08FD60C
NASA/JPL/CaltechUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT)UNSPECIFIED
R. Howard Webster Foundation FellowshipUNSPECIFIED
Canadian Institute for Advanced Research (CIFAR)UNSPECIFIED
Canada Research Chairs ProgramUNSPECIFIED
Lorne Trottier Chair in Astrophysics and CosmologyUNSPECIFIED
NASANNX10AI72G
NASANNX13AI34G
Department of Energy (DOE)DE-AC52-07NA27344
Subject Keywords:pulsars: individual (1E 1841–045); stars: magnetars; stars: neutron
Record Number:CaltechAUTHORS:20140121-141233775
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140121-141233775
Official Citation:NuSTAR Observations of Magnetar 1E 1841–045 Hongjun An et al. 2013 ApJ 779 163
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43456
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:22 Jan 2014 16:45
Last Modified:11 Oct 2017 14:50

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