Mathematics – Logic
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360815f&link_type=abstract
American Astronomical Society, AAS Meeting #213, #608.15
Mathematics
Logic
Scientific paper
Compact objects with larger stellar masses and effective radii 0.5-1 kpc have been observed at redshifts z 1-2. While it seems plausible that these systems are progenitors of the local early-type massive galaxy population, their several hundred times higher stellar densities are an outstanding puzzle. Using the TreeSPH code GASOLINE we have been simulating the formation of massive galaxies in a cosmological context. We find that our simulations are able to produce massive galaxies resembling ellipticals/S0s at z=0. Furthermore, at high redshift the resolved progenitor of a massive z=0 early type descendant hosts a massive, extended gas disk of size, mass profile, star formation rate and dynamical properties similar to the ones of massive disks that have been observed at such redshifts. This result offers support to a scenario where such high-z disks will evolve into massive early-type galaxies by z=0. In order to study what drives the evolution of the size-mass relationship for the massive central group galaxy we separated the contributions to the stellar mass growth into accretion of pre-made stellar units, and of in-situ star formation. We find that between z 2 and z=0 there is only a weak (2x) evolution of the stellar density within the inner 2 kpc in the massive central group member. Rather, the central galaxy steadily grows a stellar envelope outside the innermost kpc.
Carollo Marcella
Feldmann Robert
Mayer Larry
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