Repozytorium Uniwersytetu Jagiellońskiego

Determination of intrinsic slope of the luminosity-time correlation in x-ray afterglows of GRBs and its implications

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dc.contributor.author

Dainotti, Maria [SAP11020073]

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Vahe', Petrosian

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Ostrowski, Michał [SAP11009779]

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Jantzen, Robert T.

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Rosquist, Kjell

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Ruffini, Remo

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dc.date.accessioned

2015-07-18T07:24:26Z

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2015-07-18T07:24:26Z

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2015

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dc.identifier.isbn

978-981-4612-14-2 (set)

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978-981-4612-18-0 (v. 1)

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978-981-4612-19-7 (v. 2)

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978-981-4612-20-3 (v. 3)

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http://ruj.uj.edu.pl/xmlui/handle/item/13304

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eng

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dc.title

Determination of intrinsic slope of the luminosity-time correlation in x-ray afterglows of GRBs and its implications

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BookSection

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New Jersey

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London

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Singapore

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Beijing

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Shanghai

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Hong Kong

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Taipei

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Chennai : World Scientific

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dc.description.physical

2106-2109

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dc.abstract.en

Gamma-ray bursts (GRBs), which have been observed up to redshifts z \approx 9.5 can be good probes of the early universe and have the potential of testing cosmological models. The analysis by Dainotti of GRB Swift afterglow lightcurves with known redshifts and definite X-ray plateau shows an anti-correlation between the rest frame time when the plateau ends (the plateau end time) and the calculated luminosity at that time (or approximately an anti-correlation between plateau duration and luminosity). We present here an update of this correlation with a larger data sample of 101 GRBs with good lightcurves. Since some of this correlation could result from the redshift dependences of these intrinsic parameters, namely their cosmological evolution we use the Efron-Petrosian method to reveal the intrinsic nature of this correlation. We find that a substantial part of the correlation is intrinsic and describe how we recover it and how this can be used to constrain physical models of the plateau emission, whose origin is still unknown. The present result could help clarifing the debated issue about the nature of the plateau emission. This result is very important also for cosmological implications, because in literature so far GRB correlations are not corrected for redshift evolution and selection biases. Therefore we are not aware of their intrinsic slopes and consequently how far the use of the observed correlations can influence the derived ‘best’ cosmological settings. Therefore, we conclude that any approach that involves cosmology should take into consideration only intrinsic correlations not the observed ones.

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cosmological parameters

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gamma-rays bursts

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general

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models

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dc.description.publication

0,3

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dc.description.conftype

international

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dc.identifier.doi

10.1142/9789814623995_0369

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dc.identifier.eisbn

978-981-4630-00-9

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dc.title.container

The thirteenth Marcel Grossmann meeting : on recent developments in theoretical and experimental general relativity, astrophysics, and relativistic field theories : proceedings of the MG13 Meeting on General Relativity Stockholm University, Stockholm, Sweden, 1-7 July 2012

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eng

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dc.affiliation

Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne

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dc.subtype

ConferenceProceedings

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dc.conference

Thirteenth Marcel Grossmann Meeting on General Relativity; 2012-07-01; 2012-07-07; Sztokholm; Szwecja; ; ; ;

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dc.rights.original

bez licencji

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