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19 April 2024 |
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Dynamical and photometric imprints of feedback processes on the early evolution of E/S0 galaxies | | M. Cirasuolo
; F. Shankar
; G.L. Granato
; G. De Zotti
; L. Danese
; | | Date: |
27 Apr 2005 | | Journal: | Astrophys.J. 629 (2005) 816-824 | | Subject: | astro-ph | | Abstract: | We show that the observed Velocity Dispersion Function of E/S0 galaxies matches strikingly well the distribution function of virial velocities of massive halos virializing at z > 1.5, as predicted by the standard hierarchical clustering scenario in a LambdaCDM cosmology, for a constant ratio sigma/V_vir = 0.55 pm 0.05, close to the value expected at virialization if it typically occurred at z > 3. This strongly suggests that dissipative processes and later merging events had little impact on the matter density profile. Adopting the above sigma/V_vir ratio, the observed relationships between photometric and dynamical properties which define the fundamental plane of elliptical galaxies, such as the luminosity-sigma (Faber-Jackson) and the luminosity-effective radius relations, as well as the M_BH-sigma relation, are nicely reproduced. Their shapes turn out to be determined by the mutual feedback of star-formation (and supernova explosions)and nuclear activity, along the lines discussed by Granato et al. (2004). To our knowledge, this is the first semi-analytic model for which simultaneous fits of the fundamental plane relations and of the epoch-dependent luminosity function of spheroidal galaxies have been presented. | | Source: | arXiv, astro-ph/0504600 | | Services: | Forum | Review | PDF | Favorites | |
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