Faint Infrared-Excess Field Galaxies: FROGs
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Deep near-infrared and optical imaging surveys in the field reveal a curious population of galaxies that are infrared-bright (I-K>4), yet with relatively blue optical colors (V-I<2). Their surface density, several per square arcminute at K>20, is high enough that if placed at z>1 as our models suggest, their space densities are about one-tenth of phi-*. The colors of these ``faint red outlier galaxies'' (fROGs) may derive from exceedingly old underlying stellar populations, a dust-embedded starburst or AGN, or a combination thereof. Determining the nature of these fROGs, and their relation with the I-K>6 ``extremely red objects,'' has implications for our understanding of the processes that give rise to infrared-excess galaxies in general. We report on an ongoing study of several targets with HST & Keck imaging and Keck/LRIS multislit spectroscopy.
4 pages, 2 postscript figures; uses paspconf & psfig. To appear in "The Young Universe: Galaxy Formation and Evolution at Intermediate and High Redshift," eds. S.D'Odorico, A.Fontana and E. Giallongo, A.S.P. Conf. Ser. Also available at ftp://coma.berkeley.edu/pub/lmoustakas/Rome_frogs/
4 pages, 2 postscript figures; uses paspconf & psfig. To appear in "The Young Universe: Galaxy Formation and Evolution at Intermediate and High Redshift," eds. S.D'Odorico, A.Fontana and E. Giallongo, A.S.P. Conf. Ser. Also available at ftp://coma.berkeley.edu/pub/lmoustakas/Rome_frogs/