Dainotti 2013 L_X-t_break关系

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Title:		Determination of the Intrinsic Luminosity Time Correlation in the X-Ray Afterglows of Gamma-Ray Bursts
Authors:		Dainotti, Maria Giovanna; Petrosian, Vahe'; Singal, Jack; Ostrowski, Michal
Affiliation:		AA(Department of Physics & Astronomy, Stanford University, Via Pueblo Mall 382, Stanford, CA 94305-4060, USA ; Obserwatorium Astronomiczne, Uniwersytet Jagielloński, ul. Orla 171, 31-501 Kraków, Poland; mdainott@stanford.edu), AB(Department of Physics & Astronomy, Stanford University, Via Pueblo Mall 382, Stanford, CA 94305-4060, USA vahep@stanford.edu), AC(Department of Physics & Astronomy, Stanford University, Via Pueblo Mall 382, Stanford, CA 94305-4060, USA; Physics Department, University of Richmond, 28 Westhampton Way, Richmond, VA 23173, USA; jacks@slac.stanford.edu), AD(Department of Physics & Astronomy, Stanford University, Via Pueblo Mall 382, Stanford, CA 94305-4060, USA dainotti@oa.uj.edu.pl)
Publication:		The Astrophysical Journal, Volume 774, Issue 2, article id. 157, 9 pp. (2013). (ApJ Homepage)
Publication Date:		09/2013
Origin:		IOP
Astronomy Keywords:		cosmological parameters, gamma-ray burst: general, radiation mechanisms: non-thermal
DOI:		10.1088/0004-637X/774/2/157
Bibliographic Code:		2013ApJ...774..157D

Abstract

Gamma-ray bursts (GRBs), which have been observed up to redshifts z ≈ 9.5, can be good probes of the early universe and have the potential to test cosmological models. Dainotti's analysis of GRB Swift afterglow light curves with known redshifts and a 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). Here, we present an update of this correlation with a larger data sample of 101 GRBs with good light curves. 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, the origin of which is still unknown. The present result could help to clarify the debated nature of the plateau emission.

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