| タイトル | Chandra and RXTE Observations of 1E 1547.0-5408: Comparing the 2008 and 2009 Outbursts |
| 本文（外部サイト） | http://hdl.handle.net/2060/20110008141 |
| 著者（英） | Ng, C.-Y.; Scholz, P.; Gavril, F. P.; Guever, T.; Oezel, F.; Dib, R.; Olausen, S. A.; Woods, P. M.; Kaspi, V. M. |
| 著者所属（英） | McGill Univ. |
| 発行日 | 2010-08-04 |
| 言語 | eng |
| 内容記述 | We 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. |
| NASA分類 | Astrophysics |
| 権利 | Copyright, Distribution under U.S. Government purpose rights |
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