Bibcode
                                    
                            Trujillo, I.; Quilis, V.
    Referencia bibliográfica
                                    The Astrophysical Journal Letters, Volume 773, Issue 1, article id. L8, 4 pp. (2013).
Fecha de publicación:
    
                        8
            
                        2013
            
  Número de citas
                                    52
                            Número de citas referidas
                                    47
                            Descripción
                                    The number of present day massive galaxies that have survived untouched
since their formation at high-z is an important observational constraint
to the hierarchical galaxy formation models. Using three different
semianalytical models based on the Millenium simulation, we quantify the
expected fraction and number densities of the massive galaxies that form
at z > 2 and have evolved in stellar mass less than 10% and 30%. We
find that only a small fraction of the massive galaxies that already
formed at z ~ 2 have remained almost unaltered since their formation
(<2% with ΔM sstarf/M sstarf < 0.1 and
<8% with ΔM sstarf/M sstarf < 0.3).
These fractions correspond to the following number densities of massive
relics in the present day universe: ~1.2 × 10–6
Mpc–3 for ΔM sstarf/M
sstarf < 0.1 and ~5.7 × 10–6
Mpc–3 for ΔM sstarf/M
sstarf < 0.3. The observed number of relic candidates
found in the nearby universe is rather uncertain today (with
uncertainties up to a factor of ~100), preventing us from establishing
firm conclusions about the ability of current theoretical expectations
to predict such an important number.
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