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NuSTAR Observations of X-Ray Bursts from the Magnetar 1E 1048.1–5937

An, Hongjun and Kaspi, Victoria M. and Beloborodov, Andrei M. and Kouveliotou, Chryssa and Archibald, Robert F. and Boggs, Steven E. and Christensen, Finn E. and Craig, William W. and Gotthelf, Eric V. and Grefenstette, Brian W. and Hailey, Charles J. and Harrison, Fiona A. and Madsen, Kristin K. and Mori, Kaya and Stern, Daniel and Zhang, William W. (2014) NuSTAR Observations of X-Ray Bursts from the Magnetar 1E 1048.1–5937. Astrophysical Journal, 790 (1). Art. No. 60. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20140815-092605389

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Abstract

We report the detection of eight bright X-ray bursts from the 6.5 s magnetar 1E 1048.1−5937, during a 2013 July observation campaign with the Nuclear Spectroscopic Telescope Array. We study the morphological and spectral properties of these bursts and their evolution with time. The bursts resulted in count rate increases by orders of magnitude, sometimes limited by the detector dead time, and showed blackbody spectra with kT ~ 6–8 keV in the T_(90) duration of 1–4 s, similar to earlier bursts detected from the source. We find that the spectra during the tail of the bursts can be modeled with an absorbed blackbody with temperature decreasing with flux. The burst flux decays followed a power law of index 0.8–0.9. In the burst tail spectra, we detect a ~13 keV emission feature, similar to those reported in previous bursts from this source as well as from other magnetars observed with the Rossi X-ray Timing Explorer. We explore possible origins of the spectral feature such as proton cyclotron emission, which implies a magnetic field strength of B ~ 2 × 10^(15) G in the emission region. However, the consistency of the energy of the feature in different objects requires further explanation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/790/1/60DOIArticle
http://iopscience.iop.org/0004-637X/790/1/60/articlePublisherArticle
http://arxiv.org/abs/1406.3377arXivDiscussion Paper
ORCID:
AuthorORCID
Boggs, Steven E.0000-0001-9567-4224
Harrison, Fiona A.0000-0003-2992-8024
Madsen, Kristin K.0000-0003-1252-4891
Mori, Kaya0000-0002-9709-5389
Stern, Daniel0000-0003-2686-9241
Additional Information:© 2014 The American Astronomical Society. Received 2014 March 6; accepted 2014 June 12; published 2014 July 3. This work was supported under NASA Contract No. 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 (USA). 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.
Group:NuSTAR, Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANNG08FD60C
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT)UNSPECIFIED
Canadian Institute for Advanced Research (CIFAR)UNSPECIFIED
Canada Research Chairs ProgramUNSPECIFIED
Lorne Trottier Chair in Astrophysics and CosmologyUNSPECIFIED
NASANNX10AI72G
NASANNX13AI34G
Subject Keywords:pulsars: individual (1E 1048.1–5937); stars: magnetars; stars: neutron; X-rays: bursts
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2014-46
Record Number:CaltechAUTHORS:20140815-092605389
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140815-092605389
Official Citation:NuSTAR Observations of X-Ray Bursts from the Magnetar 1E 1048.1–5937 Hongjun An et al. 2014 ApJ 790 60
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48597
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:22 Aug 2014 06:18
Last Modified:10 Oct 2017 21:05

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