Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-26
Astronomy and Astrophysics
Astrophysics
Published in the Proceedings of the "I Workshop of Astronomy and Astrophysics for Students", Eds. N.R. Napolitano & M. Paolill
Scientific paper
We investigate the environmental dependence of galaxies with the star formation rate (SFR) in a complete volume limited sample of 91566 galaxies, in the redshift range $0.05 \le z \le 0.095$, and with $M_r=-20.0$ (that is M$^*$ + 1.45), selected from the Sloan Digital Sky Survey Data Release 4 (SDSS-DR4). The environment is characterized by the local number density of galaxies, defined by the parameter $\Sigma_{N}(\frac{N}{\pi*r_{N}^{2}})$, with N=5. We find a reletaion between the distance of the nearest neighbour and the SFR, and confirm the general trend for the SFR of decreasesing with increasing density.
Rifatto A.
Sorrentino Giuseppe
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