2010ApJ...711..192J -
Astrophys. J., 711, 192-200 (2010/March-1)
The environmental dependence of the evolving S0 fraction.
JUST D.W., ZARITSKY D., SAND D.J., DESAI V. and RUDNICK G.
Abstract (from CDS):
We re-investigate the dramatic rise in the S0 fraction, fS0, within clusters since z ∼ 0.5. In particular, we focus on the role of the global galaxy environment on fS0 by compiling, either from our own observations or the literature, robust line-of-sight velocity dispersions, σ's, for a sample of galaxy groups and clusters at 0.1 < z < 0.8 that have uniformly determined, published morphological fractions. We find that the trend of fS0 with redshift is twice as strong for σ < 750 km/s groups/poor clusters than for higher-σ, rich clusters. From this result, we infer that over this redshift range galaxy-galaxy interactions, which are more effective in lower-σ environments, are more responsible for transforming spiral galaxies into S0's than galaxy-environment processes, which are more effective in higher-σ environments. The rapid, recent growth of the S0 population in groups and poor clusters implies that large numbers of progenitors exist in low-σ systems at modest redshifts (∼0.5), where morphologies and internal kinematics are within the measurement range of current technology.
Abstract Copyright:
∼
Journal keyword(s):
galaxies: clusters: general - galaxies: evolution - galaxies: groups: general
Simbad objects:
34
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2010ApJ...711..192J and select 'bookmark this link' or equivalent in the popup menu