Mathematics – Logic
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mst...........m&link_type=abstract
Masters Thesis, IAG, Univ. de São Paulo, 68 pages (2003)
Mathematics
Logic
17
Galaxies: Evolution, Galaxies: Stellar Content, Stars: Formation, Surveys
Scientific paper
We investigate the environmental dependence of galaxies with star formation from a volume-limited sample of 1188 nearby galaxy spectra extracted from the 2dF Galaxy Redshift Survey. The environment is characterized by the local number density of galaxies. We discriminate the star-forming galaxies in distinct spectral classes by the use of a set of equivalent widths. The frequency of galaxies of different classes are then evaluated as a function of the environment. We show that the fraction of star-forming galaxies decreases in dense regions, where the population of passive galaxies is high. On the other hand, when we analyse the fraction of short starburst galaxies we note that it is not environment dependent, and in denser regions some of these objects show morphological distortions. We also show that the star formation rate of galaxies, based on the Hα equivalent width, decreases with increasing density. We propose that tidal interactions are responsible for decreasing the star formation in high density environments, by means of the suppression of galaxies' gaseous reservoirs. However, these interactions can also produce short starbursts and morphological peculiarities in galaxies localized in high density environments. Thus, we argue that the evolution of star formation properties of galaxies, although more intense and important in clusters, occurs in all environments.
These results were published in Mateus & Sodré (2004), MNRAS, 349, 1251.
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