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For refcode 1998ApJ...501..533A:
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1998ApJ...501..533A Is There a Deficit of S0 Galaxies at Intermediate Redshift? S. ANDREON Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy; andreon@na.astro.it Received 1997 November 18; accepted 1998 February 16 ABSTRACT Two contradictory results on the evolution of SO galaxies now exist in the recent literature: either S0's are old (z_formation_ > 2) and are evolving passively or most of them form at z < 0.5, as implied by the deficit of S0's in intermediate-redshift (z ~ 0.5) clusters. The resolution of this controversy may be that the apparent deficit of S0's has been derived from a quantity-the E-to-S0 ratio-that is prone to morphological classification errors. Once all sources of error are taken into account, the E-to-S0 ratios of clusters at different redshifts are fully compatible, and no additional creation of S0's at z < 0.5 is required by the data. Furthermore, there is no deficit at all of S0's in the intermediate- redshift cluster for which we have morphological types of very high quality and thus derive an E-to-S0 ratio with a small error. Subject headings: galaxies: clusters: general-galaxies: elliptical and lenticular, cD-galaxies: evolution-galaxies: statistics
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