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Article: The role of newly born magnetars in gamma-ray burst X-ray afterglow emission: Energy injection and internal emission

TitleThe role of newly born magnetars in gamma-ray burst X-ray afterglow emission: Energy injection and internal emission
Authors
KeywordsGamma-ray burst: general
Stars: neutron
Issue Date2010
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2010, v. 715 n. 1, p. 477-484 How to Cite?
AbstractSwift observations suggest that the central compact objects of some gamma-ray bursts (GRBs) could be newly born millisecond magnetars. Therefore, considering the spin evolution of the magnetars against r-mode instability, we investigate the role of magnetars in GRB X-ray afterglow emission. Besides modifying the conventional energy injection model, we pay particular attention to the internal X-ray afterglow emission, whose luminosity is assumed to track the magnetic dipole luminosity of the magnetars with a certain fraction. Following a comparison between the model and some selected observational samples, we suggest that some so-called canonical X-ray afterglows including the shallow decay, normal decay, and steeper-than-normal decay phases could be internally produced by the magnetars (possibly through some internal dissipations of the magnetar winds), while the (energized) external shocks are associated with another type of X-ray afterglows. If this is true, then from those internal X-ray afterglows we can further determine the magnetic field strengths and the initial spin periods of the corresponding magnetars. © 2010. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/65473
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
Funding AgencyGrant Number
Government of the Hong Kong SARHKU7011/09P
CCNUCCNU09A01020
Funding Information:

This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. We acknowledge useful comments by the referee. This work is supported by the GRF Grants of the Government of the Hong Kong SAR under HKU7011/09P. Y.W.Y. is also supported by the Self-Determined Research Funds of CCNU (CCNU09A01020) from the colleges' basic research and operation of MOE.

References

 

DC FieldValueLanguage
dc.contributor.authorYu, YWen_HK
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorCao, XFen_HK
dc.date.accessioned2010-08-10T02:48:49Z-
dc.date.available2010-08-10T02:48:49Z-
dc.date.issued2010en_HK
dc.identifier.citationAstrophysical Journal Letters, 2010, v. 715 n. 1, p. 477-484en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/65473-
dc.description.abstractSwift observations suggest that the central compact objects of some gamma-ray bursts (GRBs) could be newly born millisecond magnetars. Therefore, considering the spin evolution of the magnetars against r-mode instability, we investigate the role of magnetars in GRB X-ray afterglow emission. Besides modifying the conventional energy injection model, we pay particular attention to the internal X-ray afterglow emission, whose luminosity is assumed to track the magnetic dipole luminosity of the magnetars with a certain fraction. Following a comparison between the model and some selected observational samples, we suggest that some so-called canonical X-ray afterglows including the shallow decay, normal decay, and steeper-than-normal decay phases could be internally produced by the magnetars (possibly through some internal dissipations of the magnetar winds), while the (energized) external shocks are associated with another type of X-ray afterglows. If this is true, then from those internal X-ray afterglows we can further determine the magnetic field strengths and the initial spin periods of the corresponding magnetars. © 2010. The American Astronomical Society. All rights reserved.en_HK
dc.languageeng-
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsThe Astrophysical Journal. Copyright © American Astronomical Society.-
dc.subjectGamma-ray burst: generalen_HK
dc.subjectStars: neutronen_HK
dc.titleThe role of newly born magnetars in gamma-ray burst X-ray afterglow emission: Energy injection and internal emissionen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=715&issue=1&spage=477&epage=484&date=2010&atitle=The+role+of+newly+born+magnetars+in+gamma-ray+burst+X-ray+afterglow+emission:+energy+injection+and+internal+emission-
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1088/0004-637X/715/1/477en_HK
dc.identifier.scopuseid_2-s2.0-77951870927en_HK
dc.identifier.hkuros171003-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77951870927&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume715en_HK
dc.identifier.issue1en_HK
dc.identifier.spage477en_HK
dc.identifier.epage484en_HK
dc.identifier.isiWOS:000277216100039-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridYu, YW=10939495100en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridCao, XF=23484109800en_HK

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