Measuring cosmology with Gamma-Ray Bursts

Dai, Z. G. and Xu, D. and Liang, E. W. (2005) Measuring cosmology with Gamma-Ray Bursts. Il nuovo cimento C, 28 (4\5). pp. 657-660. ISSN 1826-9885

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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 Eγ of a GRB jet and the peak energy Ep of the νFν 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+0.42−0.07 (1σ) for a flat ΛCDM universe with the median circumburst density n � 3.0 cm−3. Theoretical investigations of the Eγ ∝ Eap relation reach a ∼ 1.5. A larger sample in the Swift era is expected to provide further constraints on the GRB cosmography.

Item Type: Article
Additional Information: Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004.
Uncontrolled Keywords: γ-ray sources; γ-ray bursts ; Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)
Subjects: 500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse
Depositing User: Marina Spanti
Date Deposited: 16 Mar 2020 17:55
Last Modified: 16 Mar 2020 17:55

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