Bibcode
Ferré-Mateu, Anna; Trujillo, I.; Martín-Navarro, Ignacio; Vazdekis, A.; Mezcua, Mar; Balcells, M.; Dominguez-Palmero, L.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 467, Issue 2, p.1929-1939
Fecha de publicación:
5
2017
Número de citas
82
Número de citas referidas
76
Descripción
We confirm two new local massive relic galaxies, i.e. untouched
survivors of the early Universe massive population: Mrk 1216 and PGC
032873. Both show early and peaked formation events within very short
time-scales (<1 Gyr) and thus old mean mass-weighted ages (∼13
Gyr). Their star formation histories remain virtually unchanged out to
several effective radii, even when considering the steeper
initial-mass-function values inferred out to ∼3 effective radii.
Their morphologies, kinematics and density profiles are like those found
in the z > 2 massive population, setting them apart from the typical
z ∼ 0 massive early-type galaxies. We find that there seems to exist
a degree of relic that is related to how far into the path, to become
one of these typical z ∼ 0 massive galaxies, the compact relic has
moved. This path is partly dictated by the environment the galaxy lives
in. For galaxies in rich environments, such as the previously reported
relic galaxy NGC 1277, the most extreme properties (e.g. sizes, short
formation time-scales, larger supermassive black holes) are expected,
while lower density environments will have galaxies with delayed and/or
extended star formations, slightly larger sizes and not that extreme
black hole masses. The confirmation of three relic galaxies up to a
distance of 106 Mpc, implies a lower limit in the number density of
these red nuggets in the local Universe of 6 × 10-7
Mpc3, which is within the theoretical expectations.
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