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Chandra and RXTE Observations of 1E 1547.0-5408: Comparing the 2008 and 2009 OutburstsWe present results from observations of the magnetar 1E 1547.0-5408 (SGR J1550-5418) taken with the Chandra X-ray Observatory and the Rossi X-ray Timing Explorer (RXTE) following the source s outbursts in 2008 October and 2009 January. During the time span of the Chandra observations, which covers days 4 through 23 and days 2 through 16 after the 2008 and 2009 events, respectively, the source spectral shape over the Chandraband remained stable, while the pulsar s spindown rate in the same span in 2008 increased by a factor of 2.2 as measured by RXTE. This suggests decoupling between the source s spin-down and radiative changes, hence between the spin-down-inferred magnetic field strength and that inferred spectrally. The lack of spectral variation during flux decay is surprising for models of magnetar outbursts. We also found a strong anti-correlation between the phase-averaged flux and the pulsed fraction in the 2008 and 2009 Chandra data, but not in the pre-2008 measurements. We discuss these results in the context of the magnetar model.
Document ID
20110008141
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Ng, C.-Y. (McGill Univ. Montreal, Quebec, Canada)
Kaspi, V. M. (McGill Univ. Montreal, Quebec, Canada)
Dib, R. (McGill Univ. Montreal, Quebec, Canada)
Olausen, S. A. (McGill Univ. Montreal, Quebec, Canada)
Scholz, P. (McGill Univ. Montreal, Quebec, Canada)
Guever, T. (Arizona Univ. Tucson, AZ, United States)
Oezel, F. (Arizona Univ. Tucson, AZ, United States)
Gavril, F. P. (Maryland Univ. Baltimore County Baltimore, MD, United States)
Woods, P. M. (Corvid Technologies, Inc. United States)
Date Acquired
August 25, 2013
Publication Date
August 4, 2010
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Public Use Permitted.

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