Observation of the early universe at z~15 using GRBs

Details Observation of the early universe at z~15 using GRBs Observation of the early universe at z~15 using GRBs

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004asthe..97..516m&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 97, No. 9, p. 516 - 522 (2004)

Astronomy and Astrophysics

Astronomy

2

Early Universe, Gamma-Ray Bursts

Scientific paper

Observations of the early universe beyond z~5 are very active. Recently two observations beyond z~7 were reported by the Keck-Hubble and also by the VLT telescopes independently. The VLT result has reached to z=10 for the first time. In this report, a GRB formation rate beyond z=10 is derived using the distances of the weak GRBs. These GRB distances were estimated based on the spectral Ep-Luminosity relation, which was discovered by us. Influences of our result to the re-ionization and the heavy-element abundances in the early universe are suggested.

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