ar X iv : a st ro - p h / 99 05 28 1 v 1 2 1 M ay 1 99 9 CLUSTER MASS FUNCTION IN MIXED MODELS
نویسندگان
چکیده
Received ; accepted – 2 – ABSTRACT We study the cluster mass function in mixed dark matter (MDM) models, using two COBE normalized simulations with Ω h = 0.26 and n = 1.2, and Ω h = 0.14 and n = 1.05, both with 2 massive ν's (MDM1 and MDM2, respectively). For the sake of comparison, we also simulate a CDM model with spectral index n = 0.8 (TCDM), also COBE normalized. We argue that, in our non–hydro simulations, where CDM particles describe both actual CDM and baryons, the galaxy distribution traces CDM particles. Therefore, we use them to define clusters and their velocities to work out cluster masses. As CDM particles are more clustered than HDM and therefore have, in average, greater velocities, this leads to significant differences from PS predictions.
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