Bibcode
Mármol-Queraltó, E.; Trujillo, I.; Pérez-González, P. G.; Varela, J.; Barro, G.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 422, Issue 3, pp. 2187-2194.
Advertised on:
5
2012
Citations
34
Refereed citations
27
Description
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.
Related projects
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology
We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.
Ignacio
Martín Navarro