The Role Of The Group Environment In Shaping The Hubble Sequence: Results From The ZENS Survey

Details The Role Of The Group Environment In Shaping The Hubble Sequence: Results From The ZENS Survey The Role Of The Group Environment In Shaping The Hubble Sequence: Results From The ZENS Survey

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21537605c&link_type=abstract

American Astronomical Society, AAS Meeting #215, #376.05; Bulletin of the American Astronomical Society, Vol. 42, p.585

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There is compelling evidence that groups of galaxies are playing a key role in driving galaxy evolution and shaping the observed Hubble sequence.
The degree to which the group environment affects galaxy properties, and the specific physical processes which are responsible for transformations in morphology and star formation activity, are still debated.
We present new results from the Zurich Environmental Survey (ZENS), an optical imaging survey of 141 groups with at least 5 members selected from the 2PIGG catalogue (Eke et al. 2004) in the redshift range 0.05Our group sample spans a wide range in mass and luminosity and it thus represents a statistically significant sampling of the population of galaxy groups observed in the local Universe.
Our survey improves over previous studies by measuring a variety of structural and photometric properties, not only "globally" for the galaxy, but also for the galactic sub-components (such as bulges, bars, etc.). Furthermore, detailed information on the location of our groups with respect to the large scale structure (i.e. if they reside in under- or over-dense regions) is available.
We study the impact of the local group environment by investigating how the properties of galaxies depend on group luminosity, dynamical mass, compactness and gas content. We also consider trends with distance to the group centre. The importance of the rank of a galaxy is assessed by comparing the star-formation histories, and the morphological and structural properties of central and satellite galaxies in groups.

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