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, 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
TL;DR
This paper confirms a distant galaxy at redshift 4.547 undergoing an extreme starburst, characterized by intense star formation, a merger morphology, and a young stellar population, providing insights into early galaxy evolution.
Contribution
First spectroscopic confirmation of an extreme starburst galaxy at z=4.547, revealing its merger state, high star formation rate, and young stellar age.
Findings
Star formation rate >1000 solar masses per year
Multiple Ly-Alpha components indicating a merger
Galaxy age estimated at 2-8 million years
Abstract
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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