A Deep Submillimeter Survey of Lensing Clusters: A New Window on Galaxy Formation and Evolution

摘要: We present the first results of a submillimeter survey distant clusters using new Submillimeter Common-User Bolometer Array (SCUBA) on James Clerk Maxwell Telescope. have mapped fields in two massive, concentrated clusters, A370 at z=0.37 and Cl 2244-02 z=0.33, wavelengths 450 850 μm. The resulting continuum maps cover total area about 10 arcmin2 to 1 σ noise levels less than 14 2 mJy beam-1 wavelengths, 2-3 orders magnitude deeper was previously possible. lensing exploit amplification all background sources by cluster, improving sensitivity factor 1.3-2 as compared with blank-field survey. A cumulative source surface density (2.4±1.0)×103 deg-2 is found 50% completeness limit ~4 spectral properties these indicate that majority lie high redshift, z>1. Without correcting for lens amplification, our observations counts this depth. 3 greater expectation nonevolving model local IRAS 60 μm luminosity function. observed thus require substantial increase number strongly star-forming galaxies high-redshift universe suggest optical surveys may substantially underestimated star formation universe. Deeper SCUBA should detect large numbers redshift so provide strong constraints normal galaxies.