Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-04
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures. To be published in Conference Proceedings "The Fabulous Destiny of Galaxies; Bridging Past and Present", M
Scientific paper
The evolution of galaxies in groups may have important implications for the global evolution of star formation rate in the Universe, since many processes which operate in groups may suppress star formation, and the fraction of galaxies bound in groups at the present day is as high as ~60%. We present an analysis of our sample of 0.3<=z<=0.55 groups, selected from the CNOC2 redshift survey and supplemented with deep spectroscopy and HST ACS imaging. We find that these groups contain significantly more passive galaxies than the field, with excesses of S0, elliptical and passive spiral galaxy types. The morphological composition is closely matched to that of more massive irregular clusters at a similar epoch. Contrasting with galaxy samples in a variety of environments and epochs, we find that the fraction of passive galaxies (EW[OII]<5A), is strongly evolving in the group environment, with parallel evolution in the (global) field population, whilst little evolution is observed in cluster cores since z~1.
Augustus Oemler Jr.
Balogh Michael L.
Bower Richard G.
Carlberg Ray G.
Mulchaey John S.
No associations
LandOfFree
The CNOC2 sample of intermediate redshift galaxy groups - the powerhouse of galaxy evolution does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The CNOC2 sample of intermediate redshift galaxy groups - the powerhouse of galaxy evolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The CNOC2 sample of intermediate redshift galaxy groups - the powerhouse of galaxy evolution will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-82934