Details

Autor(en) / Beteiligte

• Fritz, J
• Poggianti, B M
• Cava, A
• Moretti, A
• Varela, J
• Bettoni, D
• Couch, W J
• D'Onofrio, M D'Onofrio
• Dressler, A
• Fasano, G
• Kjaergaard, P
• Marziani, P
• Moles, M
• Omizzolo, A

Titel

WINGS-SPE: III. Equivalent width measurements, spectral properties, and evolution of local cluster galaxies

Ist Teil von

• Astronomy and astrophysics (Berlin), 2014-06, Vol.566, p.np-np

Erscheinungsjahr

2014

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Cluster galaxies are the ideal sites to look at when studying the influence of the environment on the various aspects of the evolution of galaxies, such as the changes in their stellar content and morphological transformations. In the framework of WINGS, the WIde-field Nearby Galaxy-cluster Survey, we have obtained optical spectra for ~6000 galaxies selected in fields centred on 48 local X-ray selected clusters to tackle these issues. By classifying the spectra based on given spectral lines, we investigate the frequency of the various spectral types as a function of both the clusters' properties and the galaxies' characteristics. In this way, using the same classification criteria adopted for studies at higher redshift, we can consistently compare the properties of the local cluster population to those of their more distant counterparts. The relative occurrence of post-starbursts suggests a very similar quenching efficiency in clusters at redshifts in the 0 to ~1 range. Furthermore, more important than the global environment, the local density seems to be the main driver of galaxy evolution in local clusters at least with respect to their stellar populations content.