Steps towards a map of the nearby universe

Details Steps towards a map of the nearby universe Steps towards a map of the nearby universe

2007-01-05

arxiv.org/abs/astro-ph/0701135v2

Nucl.Phys.Proc.Suppl.168:299-301,2007

Astronomy and Astrophysics

Astrophysics

3 pages, 1 figure. To appear in Nucl Phys. B, in the proceedings of the NOW-2006 (Neutrino Oscillation Workshop - 2006), R. Fo

Scientific paper

10.1016/j.nuclphysbps.2007.02.02

We present a new analysis of the Sloan Digital Sky Survey data aimed at producing a detailed map of the nearby (z < 0.5) universe. Using neural networks trained on the available spectroscopic base of knowledge we derived distance estimates for about 30 million galaxies distributed over ca. 8,000 sq. deg. We also used unsupervised clustering tools developed in the framework of the VO-Tech project, to investigate the possibility to understand the nature of each object present in the field and, in particular, to produce a list of candidate AGNs and QSOs.

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