Spitzer Space Telescope - Directors Discretionary Time Proposal #548


Spitzer Followup and of Key Discoveries in Herschel-ATLAS Science 
Demonstration Phase Field

Principal Investigator: Asantha Cooray
           Institution: UC Irvine

     Technical Contact: Asantha Cooray, UC Irvine

Co-Investigators: 
Alexandre  Amblard, UC Irvine
Steve Eales, Cardiff University
Loretta Dunne, U. of Nottingham
Elizabeth Barton, UC Irvine
David Clements, Imperial
Gianfranco De Zotti, Padova
Duncan Farrah, Sussex
David Frayer, NOAO
Dominic Benford, NASA Goddard
Jonathan Gardner, NASA Goddard
Rob Ivison, Edinburgh
Matt Jarvis, Herts
Lerothodi Leeuw, SETI Institute
Sam Kim, UC Irvine
Steve Maddox, Nottingham
Mattia Negrello, Open U
Pasquale Temi, NASA Ames
Stephen Serjeant, Open U
Paolo Serra, UC Irvine
Mark Thompson, Herts
Julie Wardlow, UC Irvine

Science Category: High-z galaxies
 Observing Modes: IRAC Post-Cryo Mapping
  Hours Approved: 8.7

Abstract:
We propose to obtain followup IRAC imaging data for four key targets 
from the 14 sq. deg. Science Demonstration Phase field of the Herschel-
ATLAS survey. This will provide a vital component  in validating and 
confirming the discoveries we have made with Herschel observations. 
H-ATLAS is the largest Open-Time Key Program of Herschel both in terms 
of time awarded (600 hours) and the total survey area (550 sq. degrees).
The targets of this proposed DDT program are (a) a proto-cluster of 
sub-mm galaxies at a redshift between 2 and 2.5 selected based on 
sub-mm colors; (b) 2 gravitationally lensed sources at redshift of 
3.04 and 2.06; and (c) an optically dark compact core, possibly a Bok 
globule with a unique origin given the location in the Galactic plane. 
Spitzer IRAC data will allow us to find counterparts to sub-mm sources 
in the high redshift proto-galaxy cluster and improve photometric redshift 
estimates of member galaxies. IRAC data of lensed sources will establish 
the spectral energy distribution of high-redshift sources and guide us 
for future followup of the 100 lensed sources expected in all of 
H-ATLAS 550 sq. degrees. IRAC data of the Galactic will allow us to 
look for the embedded Class 0 object in the sub-mm compact core.