Measuring ΩM with the Ep,i-Eiso correlation of GRBs

Details Measuring ΩM with the Ep,i-Eiso correlation of GRBs Measuring ΩM with the Ep,i-Eiso correlation of GRBs

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1059...63d&link_type=abstract

RELATIVISTIC ASTROPHYSICS: 5th Sino-Italian Workshop on Relativistic Astrophysics. AIP Conference Proceedings, Volume 1059, pp.

Astronomy and Astrophysics

Astrophysics

1

Gamma-Ray Sources (Astronomical), Supernova Remnants, Cosmology, Astronomical Spectra, Astronomical Telescopes, Interstellar Matter

Scientific paper

Recent studies have pointed out that the Hubble diagramm for SNe-Ia may be affected by significant systematics. Therefore an independent measurement of ΩM based on a different experimental methodology is highly desirable. With this in mind, we have used the Ep,i-Eiso correlation of GRBs to measure the cosmological parameter ΩM. By adopting a maximum likelihood approach which allows us to correctly quantify the extrinsic (i.e. non-Poissonian) scatter of the correlation, we constrain (for a flat universe) ΩM to 0.02-0.68 (90% confidence level), with a best fit value of ΩM~0.15, and exclude ΩM = 1 at >99.9% confidence level. If we release the assumption of a flat universe, we still find evidence for a low value of ΩM (0.04-0.50 at 68% confidence level) and a weak dependence of the dispersion of the Ep,i-Eiso correlation on ΩΛ (with an upper limit of ΩΛ~1.15 at 90% confidence level). Our measurement makes no assumptions on the Ep,i-Eiso correlation and it does not use other calibrators to set the ``zero'' point of the relation, therefore our treatment of the data is not affected by circularity.

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