Cosmological implications of the very high redshift GRB 050904

P. A. Price*, L. L. Cowie, T. Minezaki, B. P. Schmidt, A. Songaila, Y. Yoshii

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    23 Citations (Scopus)

    Abstract

    We report near-simultaneous multicolor (RIYJHK) observations made with the MAGNUM 2 m telescope of the gamma-ray burst GRB 050904 detected by the Swift satellite. The spectral energy distribution shows a very large break between the I and J bands. Using intergalactic transmissions measured from high-redshift quasars, we show that the observations place a 95% confidence lower limit of z = 6.18 on the object, consistent with a later measured spectroscopic redshift of 6.29 obtained by Kawai et al. with the Subaru telescope. We show that the break strength in the R and I bands is consistent with that measured in the quasars. Finally, we consider the implications for the star formation history at high redshift.

    Original languageEnglish
    Pages (from-to)851-855
    Number of pages5
    JournalAstrophysical Journal
    Volume645
    Issue number2 I
    DOIs
    Publication statusPublished - 10 Jul 2006

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