Trojan Search at ESO E
Lf) provide an effective method (a) to dis Kron and A Renzini, (Dordrecht: Reidel), o criminate galaxy morphology, (b) to p.61. evaluate their intrinsic evolution and (c) Buzzoni, A: 1988, in preparation. Butcher, H. and Oemler, A.: 1984, Ap. J., 285, to estimate redshift with an accuracy of 426. 0.05. We emphasize that two main ± Coleman, G.D., Wu, C. C. and Weedman, ...--...0 requirements have to be fulfilled in order Q() D. W.: 1980, Ap. J. Supp., 43, 393. <\l to reach such a fair resolution in explor Couch, W.J. and Newell, E. B.: 1984, Ap. J., E ing the universe at large distances: 56,143. '-' <J Lf) (i) we need to observe clusters instead Couch, W.J., Ellis, R.S., Godwin, J. and Car o o of field galaxies to be able to recognize ter, 0.: 1983, MN.R.A.S., 205,1287. them with high statistical confidence; Ellis, R. S., Couch, W. J., Maclaren, I. and (ii) we need a combined comparison Koo, D.C.: 1985, MN.R.A.S., 217, 239. 2158+0351 Gunn, J. E., Hoessel, I. G. and Oke, J. B.: with evolutionary models, in order to 1986, Ap. J., 306, 30. properly account for the intrinsic photo Koo, D. C.: 1981, Ap. J. (Lett), 251, L 75. 0.4 0.5 metric properties as we use galaxies as Loh, E.D. and Spillar, E.J.: 1986, Ap. J., 303, REDSHI8 T standard candles in the cosmological 154. Figure 8: The photometrie determination of framework. Maclaren, 1., Ellis, R.S. and Couch, W.J.: the redshift of the cluster 2158 + 0351.
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