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Title: THE 2009 OUTBURST OF MAGNETAR 1E 1547--5408: PERSISTENT RADIATIVE AND BURST PROPERTIES

Abstract

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 withinmore » the magnetar model.« less

Authors:
;  [1]
  1. Department of Physics, Rutherford Physics Building, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8 (Canada)
Publication Date:
OSTI Identifier:
21587465
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 739; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/739/2/94; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CORRELATIONS; COSMIC X-RAY BURSTS; EMISSION; PULSES; COSMIC RADIATION; COSMIC RAY SOURCES; COSMIC X-RAY SOURCES; IONIZING RADIATIONS; PRIMARY COSMIC RADIATION; RADIATIONS

Citation Formats

Scholz, P., and Kaspi, V. M. THE 2009 OUTBURST OF MAGNETAR 1E 1547--5408: PERSISTENT RADIATIVE AND BURST PROPERTIES. United States: N. p., 2011. Web. doi:10.1088/0004-637X/739/2/94; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Scholz, P., & Kaspi, V. M. THE 2009 OUTBURST OF MAGNETAR 1E 1547--5408: PERSISTENT RADIATIVE AND BURST PROPERTIES. United States. doi:10.1088/0004-637X/739/2/94; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Scholz, P., and Kaspi, V. M. Sat . "THE 2009 OUTBURST OF MAGNETAR 1E 1547--5408: PERSISTENT RADIATIVE AND BURST PROPERTIES". United States. doi:10.1088/0004-637X/739/2/94; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21587465,
title = {THE 2009 OUTBURST OF MAGNETAR 1E 1547--5408: PERSISTENT RADIATIVE AND BURST PROPERTIES},
author = {Scholz, P. and Kaspi, V. M.},
abstractNote = {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.},
doi = {10.1088/0004-637X/739/2/94; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 739,
place = {United States},
year = {2011},
month = {10}
}