PI: Scott Chapman, University of Cambridge, firstname.lastname@example.org
Address: Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, United Kingdom
CoI: Ian Smail, Durham University
CoI: Rob Ivison, ATC, Edinburgh
CoI: Andrew Blain, University of Leicester
CoI: Joaquin Vieira, Caltech
Title: GNIRS spectroscopy of HDF259, a candidate z=6.3 sub-millimetre galaxy.
Abstract: Recently we found a candidate z=6.3 sub-millimetre galaxy (SMG) from a cross-match of Herschel-SPIRE sources with radio/submm catalogs in GOODS-N, FLS, and Lockman-East (>0.5 sq deg total survey region), searching for 500micron peakers. HDF259 is one of the brightest SMGs detected in these fields with S(850um)=14mJy. It has a LyAlpha, 4sigma line detection (Keck/DEIMOS), with corroborating photo-z estimates from both optical-midIR, and from submillimetre/farIR wavelengths, and is the target of accepted Herschel-PACS and VLBA radio followup proposals. It is a very luminous radio source (350mJy at 1.4GHz), and likely has a strong AGN present. Finding one z 6 source from our survey of these fields is not out of line with model predictions, but robust confirmation would clearly mark the most extreme redshift of the population (previously z=5.3). We propose to observe this SMG with GNIRS to detect the expected strong restframe UV emission lines and charcaterize the astrophysical nature (line excitation, outflow, dynamics), constraining the AGN fraction, and uncovering the ISM properties of this extreme, high-z SMG to place it in context with more nearby and common (z 2.5) ULIRGs.
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