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For refcode 1994A&A...289..381I:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1994A&A...289..381I The medium redshift clusters CL 0017-20 and CL 0500-24 L. Infante, P. Fouque, G. Hertling, M. J. Way, E. Giraud, and H. Quintana Grupo de Astrofisica, Facultad de Fisica, P. Universidad Catolica de Chile, Casilla 104, Santiago 22, Chile Observatoire de Paris-Meudon F-92l95 Meudon Principal Cedex, France Centre de Physique Theorique - C.N.R.S., Luminy Case 907, F-13288 Marseille Cedex 9, France Internet: linfante@astro.puc.cl Received 21 September 1993 / Accepted 9 February 1994 Abstract. We present magnitudes and redshifts of galaxies in the cluster of galaxies CL 0017-20 and in the double cluster CL 0500-24. Luminosity functions and velocity distributions have been derived. CL 0017-20 possesses a virial mass of 2.9 -x 10^14^ M_sun_ and a V band luminosity of 2.3 +/- 0.5 x 10^12^ L_sun_ (M/L_v_ = 127), much of it in a very compact core of size 113 kpc. Our new velocities and photometry of CL 0500-24 confirm its double nature. Our group algorithm clearly detects two subconcentrations with masses 1.9 and 2.2 X 10^14^ M_sun_. Its total V band luminosity amounts to 2.7 +/- 0.8 x 10^12^ L_sun_ (M/L_v_ of 157). Since the crossing and collapse times in both clusters are smaller than the age of the Universe, they appear bound and virialized. It is surprising that although M/L is small in these clusters, giant arcs have been detected in both. Key words: galaxies: photometry - galaxies: distances and redshifts - galaxies: clusters: individual: CL 0017-20, CL 0500-24 -dark matter
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