Bibcode
Mármol-Queraltó, E.; Trujillo, I.; Pérez-González, P. G.; Varela, J.; Barro, G.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 422, Issue 3, pp. 2187-2194.
Advertised on:
5
2012
Número de citas
34
Número de citas referidas
27
Descripción
The accretion of minor satellites has been postulated as the most likely
mechanism to explain the significant size evolution of massive galaxies
over cosmic time. Using a sample of 629 massive (Mstar˜
1011 M&sun;) galaxies from the near-infrared
Palomar/DEEP-2 survey, we explore what fraction of these objects have
satellites with 0.01 < Msat/Mcentral < 1
(1:100) up to z= 1 and what fraction have satellites with 0.1 <
Msat/Mcentral < 1 (1:10) up to z= 2 within a
projected radial distance of 100 kpc. We find that the fraction of
massive galaxies with satellites, after background correction, remains
basically constant and close to 30 per cent for satellites with a mass
ratio down to 1:100 up to z= 1, and close to 15 per cent for satellites
with a 1:10 mass ratio up to z= 2. The family of spheroid-like massive
galaxies presents a 2-3 times larger fraction of objects with satellites
than the group of disc-like massive galaxies. A crude estimation of the
number of 1:3 mergers a massive spheroid-like galaxy has experienced
since z˜ 2 is around 2. For a disc-like galaxy this number
decreases to ˜1.
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