Contents of: VI/111/./abstract/JDUNLOP_HZRGJSD.abs

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 Elliptical galaxies are thought to have formed most of their stars
 in a rapid burst at high redshift, but an unambiguous example of
 a primeval elliptical has yet to be discovered. High redshift radio
 galaxies provide the most promising candidates, but the presence
 of an active nucleus complicates the analysis of their evolutionary
 state from optical observations. We have therefore recently
 embarked on a programme to search for thermal emission from dust
 in radio galaxies at z > 2 using ground-based sub-millimetre
 photometry. We have already detected two sources (Dunlop et al.
 1994) and expect to detect many more with more sensitive sub-mm
 arrays. However, for an accurate determination of dust mass it
 is vital that these sub-mm observations be complemented by ISO
 photometry at shorter wavelengths to enable us to constrain the
 temperature distribution of the dust. We thus propose to make
 ISOPHOT observations of a sample of 10 high-redshift radio galaxies
 at 90, 160 and 200 microns (corresponding to rest-frame wavelengths
 of approximately 25, 40 and 50 microns respectively).
 Our sample has been selected to be representative of the range of
 properties (e.g. radio luminosity, radio spectral index, radio
 morphology, optical continuum shape, line luminosity etc) found
 in high-redshift radio galaxies to date. Most importantly it
 spans a factor of 1000 in radio power, a fact which will enable us
 to unambiguously separate the influence of AGN activity from the
 general underlying cosmological evolution. These observations
 will provide the first clear picture of the level of
 star-formation activity in elliptical galaxies at z = 3.

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