THE 2009 OUTBURST OF MAGNETAR 1E 1547--5408: PERSISTENT RADIATIVE AND BURST PROPERTIES
Journal Article
·
· Astrophysical Journal
- Department of Physics, Rutherford Physics Building, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8 (Canada)
The magnetar 1E 1547-5408 recently exhibited two periods of outburst, beginning on 2008 October 3 and 2009 January 22. Here we present an analysis of the persistent radiative evolution and a statistical study of the burst properties during the 2009 outburst using the Swift X-Ray Telescope. We find that the 1-10 keV flux increased by a factor of {approx}500 and hardened significantly, peaking {approx}6 hr after the onset of the outburst. The observed pulsed fraction exhibited an anti-correlation with phase-averaged flux. Properties of the several hundred X-ray bursts during the 2009 outburst were determined and compared to those from other magnetar outburst events. We find that the peaks of the bursts occur randomly in phase but that the folded counts that compose the bursts exhibit a pulse which is misaligned with the persistent pulse phase. We also report a correlation between burst hardness and flux. We compare the hardness-flux evolution of the persistent emission of both outbursts to those from other magnetars and find that although an overall trend does exist, the degree of hardening for a given increase in flux is not uniform from source to source. These results are discussed in the context of previous results and within the magnetar model.
- OSTI ID:
- 21587465
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 739; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Tue Mar 20 00:00:00 EDT 2012
· Astrophysical Journal
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OSTI ID:22016199
TEMPORAL AND SPECTRAL EVOLUTION IN X- AND {gamma}-RAYS OF MAGNETAR 1E 1547.0-5408 SINCE ITS 2008 OCTOBER OUTBURST: THE DISCOVERY OF A TRANSIENT HARD PULSED COMPONENT AFTER ITS 2009 JANUARY OUTBURST
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Sun Apr 01 00:00:00 EDT 2012
· Astrophysical Journal
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OSTI ID:22016078
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Journal Article
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Tue May 01 00:00:00 EDT 2012
· Astrophysical Journal Letters
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OSTI ID:22047871