Clues on galaxy and cluster formation from their scaling relations

Details Clues on galaxy and cluster formation from their scaling relations Clues on galaxy and cluster formation from their scaling relations

2003-11-18

arxiv.org/abs/astro-ph/0311423v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 fig., in press on the Proceedings of the ESO-USM-MPE Workshop "Multiwavelength mapping of galaxy formation and evol

Scientific paper

By means of high-resolution N-body simulations in a LambdaCDM cosmology, we verify that scaling relations similar to those observed for nearby galaxy clusters are also defined by their dark matter hosts; the slopes, however, are not the same. We then show that the scaling relations of galaxy clusters can be explained as the result of the cosmological collapse of density fluctuations at the appropriate scales, plus a systematic trend of the M/L ratio with cluster mass. The empirical fact that the exponent of the Faber-Jackson relation of elliptical galaxies is significantly different (higher) than that of clusters, force us to conclude that the galaxy scaling laws might derive from the cosmological collapse of density fluctuations at the epoch when galactic scales became non-linear, plus modifications afterward due to early-time dissipative merging.

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