Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-09-15
Astronomy and Astrophysics
Astrophysics
4 Latex pages, 2 Postscript figures, uses paspconf.sty. To appear in the Proceedings of the 1st Workshop of the Italian Networ
Scientific paper
In order to map the galaxy density field in the local universe, we select the Nearby Optical Galaxy (NOG) sample, which is a distance-limited (cz < 6000 km/s) and magnitude--limited (B < 14 mag) sample of 7076 optical galaxies which covers 2/3 (8.29 sr) of the sky (|b|>20^{\circ}) and has a good completeness in redshift (98%). In order to trace the galaxy density field on small scales, we identify the NOG galaxy systems by means of both the hierarchical and the percolation (friends of friends) methods. The NOG provides high resolution in both spatial sampling of the nearby universe and morphological galaxy classification. The NOG is meant to be the first step towards the construction of a statistically well-controlled galaxy sample with homogenized photometric data covering most of the celestial sphere.
Ceriani L.
Giuricin Giuliano
Marinoni Christian
Pisani Armando
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