NOAO >   Observing Info >   Approved Programs >   2005A-0235

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Proposal Information for 2005A-0235


PI: Jiasheng Huang, Harvard-Smithsonian CfA, jhuang@cfa.harvard.edu
Address: Optical and Infrared Astronomy, 60 Garden St MS-65, Cambridge, MA 01720, USA

CoI: Matthew Ashby, Harvard-Smithsonian CfA
CoI: Pauline Barmby, Harvard-Smithsonian CfA
CoI: Steve Willner, Harvard-Smithsonian CfA
CoI: Giovanni Fazio, Harvard-Smithsonian CfA
CoI: Dimitra Rigapoulou, Oxford University, England
CoI: Michael Pahre, Harvard-Smithsonian CfA

Title: An Unbiased Study of Galaxies at z=3: IR Photometry of Lyman-Break Galaxies with Spitzer

Abstract: Existing, reliable galaxy samples at high redshifts (z=2-4) have extreme properties because of selection effects. Lyman Break Galaxies (LBGs) are selected on the basis of their rest-frame UV emission, whereas SCUBA sources are detected in the rest-frame far-IR. No overlap is found between the two samples. With its unprecedented sensitivity, the Spitzer Space telescope has created whole new possibilities for the exploration of the mid-to-far-IR sky and in particular these high redshift, dusty sources. In our GTO IRAC deep survey field in the Extended Groth Strip area, we detect almost all LBGs in the fields in both the 3.6 and 4.5 (micron) bands, and a few in the 8 and 24(micron) bands as well. The IR-bright LBGs show dust emission in the 24(micron) band, indicating a possible connection between LBGs and SCUBA galaxies. The existing LBG sample in the EGS area is too small for us to constrain the IR properties for LBGs. We therefore propose to carry out a Lyman Break Galaxy (LBG) survey in the whole EGS area to obtain a larger sample.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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