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Measuring Ω M and Ω Λ with long‐duration gamma‐ray bursts
Author(s) -
Balastegui A.,
Canal R.,
RuizLapuente P.
Publication year - 2010
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201011406
Subject(s) - physics , duration (music) , gamma ray , astrophysics , astronomy , acoustics
Gamma‐ray bursts (GRBs) are one of the most luminous events in the Universe. In addition, the Universe itself is almost transparent to γ ‐rays, making GRBs detectable up to very high redshifts. As a result, GRBs are very suitable to probe the cosmological parameters. This work shows the potential of long‐duration GRBs for measuring the cosmological parameters Ω M and Ω Λ by comparing the observed log N ‐log P distribution with the theoretical one. Provided that the GRBs rate and luminosity function are well determined, the best values and 1 σ confidence intervals obtained are Ω M = 0.22 +0.05 –0.03 and Ω Λ = 1.06 +0.05 –0.10 . Finally, a set of simulations show the ability of the method to measure Ω M and Ω Λ (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)