Spitzer Imaging of Herschel Lensed Sub-mm Galaxies

Asantha Cooray, Julie Wardlow, Sam Kim, Ali Khostovan, Ketron Mitchell-Wynne, Elizabeth Barton, Yan Gong, Alexandre Amblard, Paolo Serra, Jeff Cooke, Dominik Riechers, Benford Dominic, David Frayer, Jonathan Gardner, Hai Fu, Shane Bussmann, Mark Gurwell, Lerothodi Leeuw, Temi Pasquale, Alex ConleyJamie Bock, Joaquin Vieira, Carrie Bridge, Jason Glenn, Michael Zemcov, Bernhard Schulz, David Shupe, Ros Hopwood, Mattia Negrello, Paola Andreani, David Clements, Helmut Dannerbauer, Gianfranco de Zotti, Loretta Dunne, James Dunlop, Steve Eales, Duncan Farrah, Rob Ivison, Matt Jarvis, Steve Maddox, Michal Michalowski, Alain Omont, Ismael Perez-Fournon, Dimitra Rigopoulou, Stephen Serjeant, Ian Smail, Mark Thompson, Mattia Vaccari, Aprajita Verma, Kirsten Coppin, Seb Oliver, Lingyu Wang

Research output: Contribution to journalArticlepeer-review

Abstract

Sub-millimeter surveys have, in the last decade, revealed an unexpected population of high-redshift dust-obscured sub-mm galaxies (SMGs) which are forming stars at a tremendous rate. Due to steep number counts and the negative k-correction at sub-mm wavelengths sub-mm surveys are effective at finding intrinsically faint, gravitationally lensed galaxies. We have now produced a reliable list of about 150 bright lensed SMGs in 200 sq. deg of the Herschel-ATLAS and HerMES (the GTO program of the SPIRE Instrument team) surveys with Herschel-SPIRE. We propose Spitzer IRAC 3.6 and 4.5 micron imaging of 122 of these gravitationally lensed SMGs. The target SMGs are selected to maximally overlap with existing and planned multi-wavelength followup programs, without duplicating existing deep IRAC data. Using the proposed Spitzer data we will: (a) Extend the SEDs of z~ 1 to 5 lensed SMGs into the near-IR regime, where derived stellar masses are more reliable than those estimated at other wavelengths alone; (b) Combine with lens models from existing and planned high-resolution sub-mm imaging (SMA, CARMA, PdBI) to map the evolution of stellar mass as a function of redshift and star-formation rate (SFR); (c) Combine with existing and planned CO and CII molecular line measurements to map the evolution of dust-to-gas and stellar-to-gas mass ratios as a function of redshift and SFR; (d) Obtain snapshot statistics on the sub-mm galaxy evolution from z of 1 to 5 as a function of stellar, dust, and gas mass to study the role of mergers and AGN contribution that may regulate the starburst phenomenon; (e) Compare our results to those from numerical simulations of high-redshift starburst galaxies to investigate the physical conditions in SMGs, and their evolutionary pathways.
Original languageEnglish
Pages (from-to)80156
JournalSpitzer Proposal ID #80156
Publication statusPublished - 1 May 2011

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