Bibcode
Ruiz, P.; Trujillo, I.; Mármol-Queraltó, E.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 454, Issue 2, p.1605-1619
Fecha de publicación:
12
2015
Número de citas
14
Número de citas referidas
14
Descripción
Using the spectroscopic catalogue of the Sloan Digital Sky Survey Data
Release 10, we have explored the abundance of satellites around a sample
of 254 massive (1011 < M⋆ < 2 ×
1011 M⊙) local (z < 0.025) galaxies. We
have divided our sample into four morphological groups (E, S0, Sa,
Sb/c). We find that the number of satellites with M⋆
≳ 109 M⊙ and R < 300 kpc depends
drastically on the morphology of the central galaxy. The average number
of satellites per galaxy host (NSat/NHost) down to
a mass ratio of 1:100 is 4.5 ± 0.3 for E hosts, 2.6 ± 0.2
for S0, 1.5 ± 0.1 for Sa and 1.2 ± 0.2 for Sb/c. The
amount of stellar mass enclosed by the satellites around massive E-type
galaxies is a factor of 2, 4 and 5 larger than the mass in the
satellites of S0, Sa and Sb/c types, respectively. If these satellites
would eventually infall into the host galaxies, for all the
morphological types, the merger channel will be largely dominated by
satellites with a mass ratio satellite-host μ > 0.1. The fact that
massive elliptical galaxies have a significant larger number of
satellites than massive spirals could point out that elliptical galaxies
inhabit heavier dark matter haloes than equally massive galaxies with
later morphological types. If this hypothesis is correct, the dark
matter haloes of late-type spiral galaxies are a factor of ˜2-3
more efficient on producing galaxies with the same stellar mass than
those dark matter haloes of early-type galaxies.
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