Constraining properties of GRB magnetar central engines using the observed plateau luminosity and duration correlation

2014
journal article
article
92
dc.abstract.enAn intrinsic correlation has been identified between the luminosity and duration of plateaus in the X-ray afterglows of gamma-ray bursts (GRBs; Dainotti et al. 2008), suggesting a central engine origin. The magnetar central engine model predicts an observable plateau phase, with plateau durations and luminosities being determined by the magnetic fields and spin periods of the newly formed magnetar. This paper analytically shows that the magnetar central engine model can explain, within the 1σ uncertainties, the correlation between plateau luminosity and duration. The observed scatter in the correlation most likely originates in the spread of initial spin periods of the newly formed magnetar and provides an estimate of the maximum spin period of ∼35 ms (assuming a constant mass, efficiency and beaming across the GRB sample). Additionally, by combining the observed data and simulations, we show that the magnetar emission is most likely narrowly beamed and has ≲20 per cent efficiency in conversion of rotational energy from the magnetar into the observed plateau luminosity. The beaming angles and efficiencies obtained by this method are fully consistent with both predicted and observed values. We find that short GRBs and short GRBs with extended emission lie on the same correlation but are statistically inconsistent with being drawn from the same distribution as long GRBs, this is consistent with them having a wider beaming angle than long GRBs.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomicznepl
dc.contributor.authorRowlinson, Antoniapl
dc.contributor.authorGompertz, Ben P.pl
dc.contributor.authorDainotti, Maria - 174440 pl
dc.contributor.authorO'Brien, Paul T.pl
dc.contributor.authorWijers, Ralph A. M. J.pl
dc.contributor.authorvan der Horst, Alexander J.pl
dc.date.accessioned2015-03-11T10:20:16Z
dc.date.available2015-03-11T10:20:16Z
dc.date.issued2014pl
dc.date.openaccess36
dc.description.accesstimepo opublikowaniu
dc.description.number2pl
dc.description.physical1779-1787pl
dc.description.versionostateczna wersja wydawcy
dc.description.volume443pl
dc.identifier.doi10.1093/mnras/stu1277pl
dc.identifier.eissn1365-2966pl
dc.identifier.issn0035-8711pl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/3697
dc.languageengpl
dc.language.containerengpl
dc.rights.licenceOTHER
dc.share.typeinne
dc.subject.engamma-ray bursts: generalpl
dc.subject.enstars: magnetarspl
dc.subtypeArticlepl
dc.titleConstraining properties of GRB magnetar central engines using the observed plateau luminosity and duration correlationpl
dc.title.journalMonthly Notices of the Royal Astronomical Societypl
dc.typeJournalArticlepl
dspace.entity.typePublication
dc.abstract.enpl
An intrinsic correlation has been identified between the luminosity and duration of plateaus in the X-ray afterglows of gamma-ray bursts (GRBs; Dainotti et al. 2008), suggesting a central engine origin. The magnetar central engine model predicts an observable plateau phase, with plateau durations and luminosities being determined by the magnetic fields and spin periods of the newly formed magnetar. This paper analytically shows that the magnetar central engine model can explain, within the 1σ uncertainties, the correlation between plateau luminosity and duration. The observed scatter in the correlation most likely originates in the spread of initial spin periods of the newly formed magnetar and provides an estimate of the maximum spin period of ∼35 ms (assuming a constant mass, efficiency and beaming across the GRB sample). Additionally, by combining the observed data and simulations, we show that the magnetar emission is most likely narrowly beamed and has ≲20 per cent efficiency in conversion of rotational energy from the magnetar into the observed plateau luminosity. The beaming angles and efficiencies obtained by this method are fully consistent with both predicted and observed values. We find that short GRBs and short GRBs with extended emission lie on the same correlation but are statistically inconsistent with being drawn from the same distribution as long GRBs, this is consistent with them having a wider beaming angle than long GRBs.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.authorpl
Rowlinson, Antonia
dc.contributor.authorpl
Gompertz, Ben P.
dc.contributor.authorpl
Dainotti, Maria - 174440
dc.contributor.authorpl
O'Brien, Paul T.
dc.contributor.authorpl
Wijers, Ralph A. M. J.
dc.contributor.authorpl
van der Horst, Alexander J.
dc.date.accessioned
2015-03-11T10:20:16Z
dc.date.available
2015-03-11T10:20:16Z
dc.date.issuedpl
2014
dc.date.openaccess
36
dc.description.accesstime
po opublikowaniu
dc.description.numberpl
2
dc.description.physicalpl
1779-1787
dc.description.version
ostateczna wersja wydawcy
dc.description.volumepl
443
dc.identifier.doipl
10.1093/mnras/stu1277
dc.identifier.eissnpl
1365-2966
dc.identifier.issnpl
0035-8711
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/3697
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights.licence
OTHER
dc.share.type
inne
dc.subject.enpl
gamma-ray bursts: general
dc.subject.enpl
stars: magnetars
dc.subtypepl
Article
dc.titlepl
Constraining properties of GRB magnetar central engines using the observed plateau luminosity and duration correlation
dc.title.journalpl
Monthly Notices of the Royal Astronomical Society
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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