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Article: Chandra and rxte observations of 1E 1547.0-5408: Comparing the 2008 and 2009 outbursts
Title | Chandra and rxte observations of 1E 1547.0-5408: Comparing the 2008 and 2009 outbursts |
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Authors | |
Keywords | Pulsars: Individual (1E 1547.0?5408, Psr J1550?5418, Sgr J1550?5418) Stars: Neutron X-Rays: Bursts |
Issue Date | 2011 |
Publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X |
Citation | Astrophysical Journal, 2011, v. 729 n. 2, article no. 131 How to Cite? |
Abstract | We present results from Chandra X-ray Observatory and Rossi X-ray Timing Explorer (RXTE) observations of the magnetar 1E 1547.0-5408 (SGR J1550-5418) 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 remained stable in the Chandra band, while the pulsar's spin-down 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. © 2011. The American Astronomical Society. All rights reserved. |
Persistent Identifier | http://hdl.handle.net/10722/180496 |
ISSN | 2023 Impact Factor: 4.8 2023 SCImago Journal Rankings: 1.905 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ng, CY | en_US |
dc.contributor.author | Kaspi, VM | en_US |
dc.contributor.author | Dib, R | en_US |
dc.contributor.author | Olausen, SA | en_US |
dc.contributor.author | Scholz, P | en_US |
dc.contributor.author | Güver, T | en_US |
dc.contributor.author | Zel, F | en_US |
dc.contributor.author | Gavriil, FP | en_US |
dc.contributor.author | Woods, PM | en_US |
dc.date.accessioned | 2013-01-28T01:38:50Z | - |
dc.date.available | 2013-01-28T01:38:50Z | - |
dc.date.issued | 2011 | en_US |
dc.identifier.citation | Astrophysical Journal, 2011, v. 729 n. 2, article no. 131 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/180496 | - |
dc.description.abstract | We present results from Chandra X-ray Observatory and Rossi X-ray Timing Explorer (RXTE) observations of the magnetar 1E 1547.0-5408 (SGR J1550-5418) 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 remained stable in the Chandra band, while the pulsar's spin-down 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. © 2011. The American Astronomical Society. All rights reserved. | en_US |
dc.language | eng | en_US |
dc.publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X | en_US |
dc.relation.ispartof | Astrophysical Journal | en_US |
dc.subject | Pulsars: Individual (1E 1547.0?5408, Psr J1550?5418, Sgr J1550?5418) | en_US |
dc.subject | Stars: Neutron | en_US |
dc.subject | X-Rays: Bursts | en_US |
dc.title | Chandra and rxte observations of 1E 1547.0-5408: Comparing the 2008 and 2009 outbursts | en_US |
dc.type | Article | en_US |
dc.identifier.email | Ng, CY: stephen_ng@hku.hk | en_US |
dc.identifier.authority | Ng, CY=rp01706 | en_US |
dc.description.nature | link_to_OA_fulltext | en_US |
dc.identifier.doi | 10.1088/0004-637X/729/2/131 | en_US |
dc.identifier.scopus | eid_2-s2.0-79952136132 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-79952136132&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 729 | en_US |
dc.identifier.issue | 2 | en_US |
dc.identifier.isi | WOS:000288608700054 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Ng, CY=24830903500 | en_US |
dc.identifier.scopusauthorid | Kaspi, VM=7006755510 | en_US |
dc.identifier.scopusauthorid | Dib, R=8609966700 | en_US |
dc.identifier.scopusauthorid | Olausen, SA=36669077400 | en_US |
dc.identifier.scopusauthorid | Scholz, P=44561412500 | en_US |
dc.identifier.scopusauthorid | Güver, T=9247225700 | en_US |
dc.identifier.scopusauthorid | Zel, F=35178895800 | en_US |
dc.identifier.scopusauthorid | Gavriil, FP=6602456240 | en_US |
dc.identifier.scopusauthorid | Woods, PM=35560112800 | en_US |
dc.customcontrol.immutable | jt 130808 | - |
dc.identifier.issnl | 0004-637X | - |