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For refcode 1993MNRAS.263..628S:
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Copyright by Royal Astronomical Society. 1993MNRAS.263..628S The nature of star formation in lensed galaxies at high redshift Ian Smail, Richard S. Ellis, Alfonso Aragon-Salamanca, Genevieve Soucail, Yannick Mellier and Edmond Giraud Physics Department, University of Durham, South Road, Durham DH1 3LE Observatoire de Toulouse, avenue Edouard Belin, F-31400 Toulouse, France Centre de Physique Theorique, CNRS Luminy, F-13288 Marseille Cedex 9, France Accepted 1993 January 27. Received 1992 December 3; in original form 1992 May 5 ABSTRACT We present near-infrared photometry of all available gravitationally lensed `arcs' with spectroscopic redshifts. By combining this photometry with optical data, we find that the bulk of the systems with z ~ 1 are intrinsically blue across the rest-frame spectral region 2000 A to 1 micron. Using a combination of optical and optical-infrared colours, we demonstrate that these systems cannot be blue by virtue of a secondary burst of star formation superimposed on an evolved population, but we are unable to distinguish directly between major star formation events in a generic young galaxy and an extended era of constant star formation typical of late-type spirals. Using various arguments, we conclude that our arcs represent modest gravitational magnification of typical field galaxies. Consequently, if the star formation seen is representative of that in field galaxies at Z >= 1, the absence of high-redshift galaxies in current deep spectroscopic surveys to b_J_ ~ 24 supports the hypothesis that the bulk of the star formation in normal galaxies occurred over an extended era up to the epoch corresponding to z ~ 1. Key words: galaxies: evolution - galaxies: formation - galaxies: photometry - cosmology: observations - gravitational lensing - infrared: galaxies.
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