Galaxy groups in the 2dF redshift survey: Effects of Environment on Star Formation

Abstract

We estimate the fraction of star forming galaxies in a catalogue of groups, constructed from the 2dF galaxy redshift survey by Merchán & Zandivarez. We use the $\eta$ spectral type parameter of galaxies and subdivide the sample of galaxies in groups into four types depending on the values of the $\eta$ parameter following Madgwick et al. We obtain a strong correlation between the relative fraction of galaxies with high star formation and the parent group virial mass. We find that even in the environment of groups with low virial mass $M\sim 10^{13}{M}_{\odot }$ the star formation of their member galaxies is significantly suppressed. The relation between the fraction of early-type galaxies and the group virial mass obeys a simple power law spanning over three orders of magnitude in virial mass. Our results show quantitatively the way that the presence of galaxies with high star formation rates is inhibited in massive galaxy systems.

Accepted for publication in MNRAS Pink Pages 3 figures

References in corpus (5)

• The 2dF Galaxy Redshift Survey: Spectra and redshifts
• The 2dF Galaxy Redshift Survey: The power spectrum and the matter content of the universe
• The 2dF Galaxy Redshift Survey: Luminosity dependence of galaxy clustering
• The 2dF Galaxy Redshift Survey: Galaxy luminosity functions per spectral type
• The 2dF Galaxy Redshift Survey: A targeted study of catalogued clusters of galaxies

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