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NuSTAR Observations of X-Ray Bursts from the Magnetar 1E 1048.1-5937We 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 is approx. 6-8 keV in the T90 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 is approx. 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 is approx. 2×10(exp15) G in the emission region. However, the consistency of the energy of the feature in different objects requires further explanation.
Document ID
20150010102
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1088/0004-637X/790/1/60
Authors
An, Hongjun (McGill Univ. Montreal, Quebec, Canada)
Kaspi, Victoria M. (McGill Univ. Montreal, Quebec, Canada)
Beloborodov, Andrei M. (Columbia Univ. New York, NY, United States)
Kouveliotou, Chryssa (NASA Marshall Space Flight Center Huntsville, AL, United States)
Archibald, Robert T. (McGill Univ. Montreal, Quebec, Canada)
Boggs, Steven E. (California Univ. Berkeley, CA, United States)
Christensen, Finn E. (Technical Univ. of Denmark Lyngby, Denmark)
Craig, William W. (California Univ. Berkeley, CA, United States)
Gotthelf, Eric V. (Columbia Univ. New York, NY, United States)
Stern, Daniel (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Zhang, William W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
June 8, 2015
Publication Date
July 3, 2014
Publication Information
Publication: The Astrophysical Journal
Publisher: The American Astronomical Society
Volume: 790
Issue: 1
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN23629
Funding Number(s)
CONTRACT_GRANT: NNX10AI72G
CONTRACT_GRANT: NNX13AI34G
CONTRACT_GRANT: NNG08FD60C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
MAGNETAR 1E 1048.1-5937
X-RAY BURSTS
NuSTAR

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