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Article: Post-outburst X-ray flux and timing evolution of Swift J1822.3-1606

TitlePost-outburst X-ray flux and timing evolution of Swift J1822.3-1606
Authors
KeywordsPulsars: Individual (Swift J1822.3-1606)
Stars: Neutron
X-Rays: Bursts
X-Rays: General
Issue Date2012
PublisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
Astrophysical Journal, 2012, v. 761 n. 1, article no. 66 How to Cite?
AbstractSwift J1822.3-1606 was discovered on 2011 July 14 by the Swift Burst Alert Telescope following the detection of several bursts. The source was found to have a period of 8.4377 s and was identified as a magnetar. Here we present a phase-connected timing analysis and the evolution of the flux and spectral properties using Rossi X-ray Timing Explorer, Swift, and Chandra observations. We measure a spin frequency of 0.1185154343(8) s -1 and a frequency derivative of -4.3 ± 0.3 × 10 -15 at MJD 55761.0, in a timing analysis that includes significant non-zero second and third frequency derivatives that we attribute to timing noise. This corresponds to an estimated spin-down inferred dipole magnetic field of B 5 × 10 13 G, consistent with previous estimates though still possibly affected by unmodeled noise. We find that the post-outburst 1-10 keV flux evolution can be characterized by a double-exponential decay with decay timescales of 15.5 ± 0.5 and 177 ± 14 days. We also fit the light curve with a crustal cooling model, which suggests that the cooling results from heat injection into the outer crust. We find that the hardness-flux correlation observed in magnetar outbursts also characterizes the outburst of Swift J1822.3-1606. We compare the properties of Swift J1822.3-1606 with those of other magnetars and their outbursts. © 2012. The American Astronomical Society. All rights reserved..
Persistent Identifierhttp://hdl.handle.net/10722/180506
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorScholz, Pen_US
dc.contributor.authorNg, CYen_US
dc.contributor.authorLivingstone, MAen_US
dc.contributor.authorKaspi, VMen_US
dc.contributor.authorCumming, Aen_US
dc.contributor.authorArchibald, RFen_US
dc.date.accessioned2013-01-28T01:38:55Z-
dc.date.available2013-01-28T01:38:55Z-
dc.date.issued2012en_US
dc.identifier.citationAstrophysical Journal, 2012, v. 761 n. 1, article no. 66en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/180506-
dc.description.abstractSwift J1822.3-1606 was discovered on 2011 July 14 by the Swift Burst Alert Telescope following the detection of several bursts. The source was found to have a period of 8.4377 s and was identified as a magnetar. Here we present a phase-connected timing analysis and the evolution of the flux and spectral properties using Rossi X-ray Timing Explorer, Swift, and Chandra observations. We measure a spin frequency of 0.1185154343(8) s -1 and a frequency derivative of -4.3 ± 0.3 × 10 -15 at MJD 55761.0, in a timing analysis that includes significant non-zero second and third frequency derivatives that we attribute to timing noise. This corresponds to an estimated spin-down inferred dipole magnetic field of B 5 × 10 13 G, consistent with previous estimates though still possibly affected by unmodeled noise. We find that the post-outburst 1-10 keV flux evolution can be characterized by a double-exponential decay with decay timescales of 15.5 ± 0.5 and 177 ± 14 days. We also fit the light curve with a crustal cooling model, which suggests that the cooling results from heat injection into the outer crust. We find that the hardness-flux correlation observed in magnetar outbursts also characterizes the outburst of Swift J1822.3-1606. We compare the properties of Swift J1822.3-1606 with those of other magnetars and their outbursts. © 2012. The American Astronomical Society. All rights reserved..en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/en_US
dc.relation.ispartofAstrophysical Journalen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPulsars: Individual (Swift J1822.3-1606)en_US
dc.subjectStars: Neutronen_US
dc.subjectX-Rays: Burstsen_US
dc.subjectX-Rays: Generalen_US
dc.titlePost-outburst X-ray flux and timing evolution of Swift J1822.3-1606en_US
dc.typeArticleen_US
dc.identifier.emailNg, CY: stephen_ng@hku.hken_US
dc.identifier.authorityNg, CY=rp01706en_US
dc.description.naturepostprinten_US
dc.identifier.doi10.1088/0004-637X/761/1/66en_US
dc.identifier.scopuseid_2-s2.0-84870348102en_US
dc.identifier.hkuros216903-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84870348102&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume761en_US
dc.identifier.issue1en_US
dc.identifier.spagearticle no. 66-
dc.identifier.epagearticle no. 66-
dc.identifier.isiWOS:000311748800066-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridScholz, P=44561412500en_US
dc.identifier.scopusauthoridNg, CY=24830903500en_US
dc.identifier.scopusauthoridLivingstone, MA=9434675600en_US
dc.identifier.scopusauthoridKaspi, VM=7006755510en_US
dc.identifier.scopusauthoridCumming, A=55124131700en_US
dc.identifier.scopusauthoridArchibald, RF=55507073900en_US

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