Model-Independent Multi-Variable Gamma-Ray Burst Luminosity Indicator and Its Possible Cosmological Implications

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dc.creatorLiang, Enwei
dc.creatorZhang, Bing
dc.date2005-04-19
dc.date2005-07-23
dc.date.accessioned2026-07-07T11:29:42Z
dc.date.available2026-07-07T11:29:42Z
dc.descriptionWe present a multi-variable regression analysis to several observable quantities for a sample of 15 gamma-ray bursts (GRBs). The observables used in the analysis includes the isotropic gamma-ray energy (E_{gamma,iso}), the peak energy of the nu F_nu spectrum in the rest frame (E_p'), and the rest frame break time of the optical afterglow light curves(t_b'). A strong dependence of E_{gamma, iso on E_p' and t_b' is derived. We also extend the analysis to the isotropic afterglow energies in the X-ray and the optical bands, respectively, and find that they are essentially not correlated with E_p' and t_b'. Regarding the E_{gamma, iso(E_p', t_b') relationship as a luminosity indicator, we explore the possible constraints on the cosmological parameters using the GRB sample. Our results indicate 0.13<omega_M<0.49 and 0.50<Omega_Lambda<0.85 for a flat Universe. The decelerating factor and its cosmological evolution, and the transition redshift are also investigated. Through Monte Carlo simulations, we find that the GRB sample satisfying our relationship observationally tends to be a soft and bright one, and that the contraints on the cosmological parameters can be much improved either by the enlargement of the sample size or by the increase of the observational precision. Furthermore, the detections of a few high redshift GRBs satisfying the correlation could greatly tighten the constraints (abridged).
dc.description10 pages (emulateapj) plus 12 figures, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0504404
dc.identifierhttp://arxiv.org/abs/astro-ph/0504404
dc.identifierAstrophys.J.633:611-623,2005
dc.identifierdoi:10.1086/491594
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196798
dc.subjectAstrophysics
dc.titleModel-Independent Multi-Variable Gamma-Ray Burst Luminosity Indicator and Its Possible Cosmological Implications
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