Measuring Omega(M) and Omega(Lambda) with long-duration gamma-ray bursts

作者：Balastegui A^*; C**** R; Ruiz Lapuente P

来源：Astronomische Nachrichten, 2010, 331(8): 837-842.

DOI：10.1002/asna.201011406

• cosmological parameters
• gamma-rays: bursts

Gamma-ray bursts (GRBs) are one of the most luminous events in the Universe. In addition, the Universe itself is almost transparent to gamma-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 Omega(M) and Omega(Lambda) 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 sigma confidence intervals obtained are Omega(M) = 0.22(-0.03)(+ 0.05) and Omega(Lambda) = 1.06(-0.10)(+ 0.05). Finally, a set of simulations show the ability of the method to measure Omega(M) and Omega(Lambda).

• 出版日期2010-9