Bibcode
Agulli, I.; Aguerri, J. A. L.; Sánchez-Janssen, R.; Barrena, R.; Diaferio, A.; Serra, A. L.; Méndez-Abreu, J.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society: Letters, Volume 444, Issue 1, p.L34-L38
Fecha de publicación:
10
2014
Número de citas
36
Número de citas referidas
35
Descripción
We present a new deep determination of the spectroscopic luminosity
function (LF) within the virial radius of the nearby and massive Abell
85 (A85) cluster down to the dwarf regime (M* + 6) using Very Large
Telescope/Visible Multi-Object Spectrograph (VLT/VIMOS) spectra for
˜2000 galaxies with mr ≤ 21 mag and
<μe,r>≤ 24 mag arcsec-2. The
resulting LF from 438 cluster members is best modelled by a double
Schechter function due to the presence of a statistically significant
upturn at the faint end. The amplitude of this upturn (α
f = -1.58^{+0.19}_{-0.15}), however, is much smaller than
that of the Sloan Digital Sky Survey (SDSS) composite photometric
cluster LF by Popesso et al., αf ˜ -2. The
faint-end slope of the LF in A85 is consistent, within the
uncertainties, with that of the field. The red galaxy population
dominates the LF at low luminosities, and is the main factor responsible
for the upturn. The fact that the slopes of the spectroscopic LFs in the
field and in a cluster as massive as A85 are similar suggests that the
cluster environment does not play a major role in determining the
abundance of low-mass galaxies.
Proyectos relacionados
Evolución de Galaxias en Cúmulos
Las estructuras en el Universo, a todas las escalas de masa, se han formado de una forma jerárquica y principalmente producidas por fusiones de galaxias. Sin embargo, esta formación jerárquica de las galaxias está modulada por el entorno en el cual se crean y evolucionan. Mientras que las galaxias de campo presentan una evolución pasiva, los
Jairo
Méndez Abreu