Spectroscopic Confirmation of an Extreme Starburst at Redshift 4.547
/ Authors
P. Capak, C. Carilli, N. Lee, T. Aldcroft, H. Aussel, E. Schinnerer, G. Wilson, Min S. Yun, A. Blain, M. Giavalisco
and 15 more authors
O. Ilbert, J. Kartaltepe, Kyoung-Soo Lee, H. McCracken, B. Mobasher, M. Salvato, S. Sasaki, K. S. Scott, K. Sheth, Y. Shioya, D. Thompson, M. Elvis, D. Sanders, N. Scoville, Y. Tanaguchi
/ Abstract
We report the spectroscopic confirmation of a submillimeter galaxy (SMG) at z = 4.547 with an estimated LIR = (0.5-2.0) × 1013 L☉. The spectra, mid-IR, and X-ray properties indicate the bolometric luminosity is dominated by star formation at a rate of >1000 M☉ yr−1. Multiple, spatially separated components are visible in the Lyα line with an observed velocity difference of up to 380 km s−1 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 >1010 M☉ of stellar mass. This object is a likely progenitor for the massive early-type systems seen at z ∼ 2.
Journal: The Astrophysical Journal Letters
DOI: 10.1086/590555