Measuring cosmology with Gamma-Ray Bursts

Details Measuring cosmology with Gamma-Ray Bursts Measuring cosmology with Gamma-Ray Bursts

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ncimc..28..657d&link_type=abstract

Il Nuovo Cimento C, vol. 28, Issue 4, p.657

Computer Science

Scientific paper

Gamma-Ray Bursts (GRBs) are becoming more and more standardizable candles. Different methods have been proposed to measure cosmology with the relation between the γ-ray energy E γ of a GRB jet and the peak energy Ep of the νF ν spectrum in the burst frame. We compare the procedures and results of these methods. Using the present sample of 17 GRBs, we obtain a constraint on the mass density ΩM = 0.22-0.07 +0.42 (1σ) for a flat ΛCDM universe with the median circumburst density n ≃ 3.0cm -3. Theoretical investigations of the E γ ∝ E a p relation reach a ˜ 1.5. A larger sample in the Swift era is expected to provide further constraints on the GRB cosmography.

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