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Spectroscopic Confirmation Of An Extreme Starburst At Redshift 4.547

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arxiv 0806.0657 v1 pith:G7QB6WRJ submitted 2008-06-03 astro-ph

Spectroscopic Confirmation Of An Extreme Starburst At Redshift 4.547

Peter Capak , C. L. Carilli , N. Lee , T. Aldcroft , H. Aussel , E. Schinnerer , G.W. Wilson , M. S. Yun
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A . Blain M. Giavalisco O. Ilbert J. Kartaltepe K.-S. Lee H. McCracken B. Mobasher M. Salvato S. Sasaki K.S. Scott K. Sheth Y. Shioya D. Thompson M. Elvis D. B. Sanders N. Z. Scoville Y.Tanaguchi
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We report the spectroscopic confirmation of a sub-mm galaxy (SMG) at z=4.547 with an estimated L_IR=0.5-2.0x10^13 L_sun. The spectra, mid-IR, and X-ray properties indicate the bolometric luminosity is dominated by star formation at a rate of >1000M_sun per yr. Multiple, spatially separated components are visible in the Ly-Alpha line with an observed velocity difference of up to 380 km/sec and the object morphology indicates a merger. The best fit spectral energy distribution and spectral line indicators suggest the object is 2-8 Myr old and contains >10^10 M_sun of stellar mass. This object is a likely progenitor for the massive early type systems seen at z~2.

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